Updated dependencies.

Bumps [golang.org/x/sys](https://github.com/golang/sys) from 0.13.0 to 0.14.0.
- [Commits](https://github.com/golang/sys/compare/v0.13.0...v0.14.0)

---
updated-dependencies:
- dependency-name: golang.org/x/sys
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/bsd.yml

@@ -0,0 +1,29 @@
+name: BSD
+
+on:
+  workflow_dispatch:
+
+jobs:
+  test:
+    runs-on: macos-12
+
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        lfs: 'true'
+
+    - name: Set up
+      uses: actions/setup-go@v4
+      with:
+        go-version: stable
+
+    - name: Build
+      run: GOOS=freebsd go test -c ./...
+
+    - name: Test
+      uses: cross-platform-actions/action@v0.21.1
+      with:
+        operating_system: freebsd
+        version: '13.2'
+        sync_files: runner-to-vm
+        run: find . -name '*.test' -maxdepth 1 -exec {} -test.v \;

.github/workflows/codeql.yml

@@ -1,76 +0,0 @@
-# For most projects, this workflow file will not need changing; you simply need
-# to commit it to your repository.
-#
-# You may wish to alter this file to override the set of languages analyzed,
-# or to provide custom queries or build logic.
-#
-# ******** NOTE ********
-# We have attempted to detect the languages in your repository. Please check
-# the `language` matrix defined below to confirm you have the correct set of
-# supported CodeQL languages.
-#
-name: "CodeQL"
-
-on:
-  push:
-    branches: [ "main" ]
-  pull_request:
-    # The branches below must be a subset of the branches above
-    branches: [ "main" ]
-  schedule:
-    - cron: '15 18 * * 6'
-
-jobs:
-  analyze:
-    name: Analyze
-    runs-on: ubuntu-latest
-    permissions:
-      actions: read
-      contents: read
-      security-events: write
-
-    strategy:
-      fail-fast: false
-      matrix:
-        language: [ 'go' ]
-        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python', 'ruby' ]
-        # Use only 'java' to analyze code written in Java, Kotlin or both
-        # Use only 'javascript' to analyze code written in JavaScript, TypeScript or both
-        # Learn more about CodeQL language support at https://aka.ms/codeql-docs/language-support
-
-    steps:
-    - name: Checkout repository
-      uses: actions/checkout@v3
-
-    # Initializes the CodeQL tools for scanning.
-    - name: Initialize CodeQL
-      uses: github/codeql-action/init@v2
-      with:
-        languages: ${{ matrix.language }}
-        # If you wish to specify custom queries, you can do so here or in a config file.
-        # By default, queries listed here will override any specified in a config file.
-        # Prefix the list here with "+" to use these queries and those in the config file.
-
-        # Details on CodeQL's query packs refer to : https://docs.github.com/en/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/configuring-code-scanning#using-queries-in-ql-packs
-        # queries: security-extended,security-and-quality
-
-
-    # Autobuild attempts to build any compiled languages  (C/C++, C#, Go, or Java).
-    # If this step fails, then you should remove it and run the build manually (see below)
-    - name: Autobuild
-      uses: github/codeql-action/autobuild@v2
-
-    # ℹ️ Command-line programs to run using the OS shell.
-    # 📚 See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsrun
-
-    #   If the Autobuild fails above, remove it and uncomment the following three lines.
-    #   modify them (or add more) to build your code if your project, please refer to the EXAMPLE below for guidance.
-
-    # - run: |
-    #     echo "Run, Build Application using script"
-    #     ./location_of_script_within_repo/buildscript.sh
-
-    - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v2
-      with:
-        category: "/language:${{matrix.language}}"

.github/workflows/cross.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+echo android       ; GOOS=android   GOARCH=amd64 go build .
+echo darwin        ; GOOS=darwin    GOARCH=amd64 go build .
+echo dragonfly     ; GOOS=dragonfly GOARCH=amd64 go build .
+echo freebsd       ; GOOS=freebsd   GOARCH=amd64 go build .
+echo illumos       ; GOOS=illumos   GOARCH=amd64 go build .
+echo ios           ; GOOS=ios       GOARCH=amd64 go build .
+echo linux         ; GOOS=linux     GOARCH=amd64 go build .
+echo netbsd        ; GOOS=netbsd    GOARCH=amd64 go build .
+echo openbsd       ; GOOS=openbsd   GOARCH=amd64 go build .
+echo plan9         ; GOOS=plan9     GOARCH=amd64 go build .
+echo solaris       ; GOOS=solaris   GOARCH=amd64 go build .
+echo windows       ; GOOS=windows   GOARCH=amd64 go build .
+# echo aix         ; GOOS=aix       GOARCH=ppc64 go build .
+echo js            ; GOOS=js        GOARCH=wasm  go build .
+echo wasip1        ; GOOS=wasip1    GOARCH=wasm  go build .
+echo darwin-flock  ; GOOS=darwin    GOARCH=amd64 go build -tags sqlite3_flock .
+echo darwin-nosys  ; GOOS=darwin    GOARCH=amd64 go build -tags sqlite3_nosys .
+echo linux-nosys   ; GOOS=linux     GOARCH=amd64 go build -tags sqlite3_nosys .
+echo windows-nosys ; GOOS=windows   GOARCH=amd64 go build -tags sqlite3_nosys .
+echo freebsd-nosys ; GOOS=freebsd   GOARCH=amd64 go build -tags sqlite3_nosys .

.github/workflows/cross.yml

@@ -0,0 +1,21 @@
+name: Cross compile
+
+on:
+  workflow_dispatch:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        lfs: 'true'
+
+    - name: Set up
+      uses: actions/setup-go@v4
+      with:
+        go-version: stable
+
+    - name: Build
+      run: .github/workflows/cross.sh

.github/workflows/go.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         lfs: 'true'
 
@@ -39,7 +39,6 @@ jobs:
 
     - name: Vet
       run: go vet ./...
-      continue-on-error: true
 
     - name: Build
       run: go build -v ./...
@@ -47,16 +46,19 @@ jobs:
     - name: Test
       run: go test -v ./...
 
+    - name: Test no locks
+      run: go test -v -tags sqlite3_nosys ./tests -run TestDB_nolock
+
     - name: Test BSD locks
-      run: go test -v -tags sqlite3_bsd ./...
+      run: go test -v -tags sqlite3_flock ./...
       if: matrix.os == 'macos-latest'
 
     - name: Coverage report
       uses: ncruces/go-coverage-report@v0
       with:
-        chart: 'true'
-        amend: 'true'
+        chart: true
+        amend: true
+        reuse-go: true
       if: |
-        matrix.os == 'ubuntu-latest' &&
-        github.event_name == 'push'
-      continue-on-error: true
+        github.event_name == 'push' &&
+        matrix.os == 'ubuntu-latest'

README.md

@@ -7,79 +7,103 @@
 Go module `github.com/ncruces/go-sqlite3` wraps a [WASM](https://webassembly.org/) build of [SQLite](https://sqlite.org/),
 and uses [wazero](https://wazero.io/) to provide `cgo`-free SQLite bindings.
 
-- Package [`github.com/ncruces/go-sqlite3`](https://pkg.go.dev/github.com/ncruces/go-sqlite3)
-wraps the [C SQLite API](https://www.sqlite.org/cintro.html)
-([example usage](https://pkg.go.dev/github.com/ncruces/go-sqlite3#example-package)).
-- Package [`github.com/ncruces/go-sqlite3/driver`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/driver)
-provides a [`database/sql`](https://pkg.go.dev/database/sql) driver
-([example usage](https://pkg.go.dev/github.com/ncruces/go-sqlite3/driver#example-package)).
-- Package [`github.com/ncruces/go-sqlite3/embed`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/embed)
-embeds a build of SQLite into your application.
-- Package [`github.com/ncruces/go-sqlite3/vfs`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/vfs)
-wraps the [C SQLite VFS API](https://www.sqlite.org/vfs.html) and provides a pure Go implementation.
+- [`github.com/ncruces/go-sqlite3`](https://pkg.go.dev/github.com/ncruces/go-sqlite3)
+  wraps the [C SQLite API](https://sqlite.org/cintro.html)
+  ([example usage](https://pkg.go.dev/github.com/ncruces/go-sqlite3#example-package)).
+- [`github.com/ncruces/go-sqlite3/driver`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/driver)
+  provides a [`database/sql`](https://pkg.go.dev/database/sql) driver
+  ([example usage](https://pkg.go.dev/github.com/ncruces/go-sqlite3/driver#example-package)).
+- [`github.com/ncruces/go-sqlite3/embed`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/embed)
+  embeds a build of SQLite into your application.
+- [`github.com/ncruces/go-sqlite3/vfs`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/vfs)
+  wraps the [C SQLite VFS API](https://sqlite.org/vfs.html) and provides a pure Go implementation.
+- [`github.com/ncruces/go-sqlite3/gormlite`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/gormlite)
+  provides a [GORM](https://gorm.io) driver.
+
+### Loadable extensions
+
+- [`github.com/ncruces/go-sqlite3/ext/array`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/blob)
+  provides the [`array`](https://sqlite.org/carray.html) table-valued function.
+- [`github.com/ncruces/go-sqlite3/ext/blob`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/blob)
+  simplifies [incremental BLOB I/O](https://sqlite.org/c3ref/blob_open.html).
+- [`github.com/ncruces/go-sqlite3/ext/csv`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/csv)
+  reads [comma-separated values](https://sqlite.org/csv.html).
+- [`github.com/ncruces/go-sqlite3/ext/lines`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/lines)
+  reads files [line-by-line](https://github.com/asg017/sqlite-lines).
+- [`github.com/ncruces/go-sqlite3/ext/stats`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/stats)
+  provides [statistics functions](https://www.oreilly.com/library/view/sql-in-a/9780596155322/ch04s02.html).
+- [`github.com/ncruces/go-sqlite3/ext/unicode`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/ext/unicode)
+  provides [Unicode aware](https://sqlite.org/src/dir/ext/icu) functions.
+- [`github.com/ncruces/go-sqlite3/vfs/memdb`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/vfs/memdb)
+  implements an in-memory VFS.
+- [`github.com/ncruces/go-sqlite3/vfs/readervfs`](https://pkg.go.dev/github.com/ncruces/go-sqlite3/vfs/readervfs)
+  implements a VFS for immutable databases.
+
+### Advanced features
+
+- [x] [incremental BLOB I/O](https://sqlite.org/c3ref/blob_open.html)
+- [x] [nested transactions](https://sqlite.org/lang_savepoint.html)
+- [x] [custom functions](https://sqlite.org/c3ref/create_function.html)
+- [x] [virtual tables](https://sqlite.org/vtab.html)
+- [x] [custom VFSes](https://sqlite.org/vfs.html)
+- [x] [online backup](https://sqlite.org/backup.html)
+- [x] [JSON support](https://www.sqlite.org/json1.html)
+- [x] [Unicode support](https://sqlite.org/src/dir/ext/icu)
 
 ### Caveats
 
-This module replaces the SQLite [OS Interface](https://www.sqlite.org/vfs.html)
+This module replaces the SQLite [OS Interface](https://sqlite.org/vfs.html)
 (aka VFS) with a [pure Go](vfs/) implementation.
 This has benefits, but also comes with some drawbacks.
 
 #### Write-Ahead Logging
 
 Because WASM does not support shared memory,
-[WAL](https://www.sqlite.org/wal.html) support is [limited](https://www.sqlite.org/wal.html#noshm).
+[WAL](https://sqlite.org/wal.html) support is [limited](https://sqlite.org/wal.html#noshm).
 
-To work around this limitation, SQLite is compiled with
-[`SQLITE_DEFAULT_LOCKING_MODE=1`](https://www.sqlite.org/compile.html#default_locking_mode),
-making `EXCLUSIVE` the default locking mode.
-For non-WAL databases, `NORMAL` locking mode can be activated with
-[`PRAGMA locking_mode=NORMAL`](https://www.sqlite.org/pragma.html#pragma_locking_mode).
+To work around this limitation, SQLite is [patched](sqlite3/locking_mode.patch)
+to always use `EXCLUSIVE` locking mode for WAL databases.
 
 Because connection pooling is incompatible with `EXCLUSIVE` locking mode,
-the `database/sql` driver defaults to `NORMAL` locking mode.
-To open WAL databases, or use `EXCLUSIVE` locking mode,
-disable connection pooling by calling
+to use the [`database/sql`](https://pkg.go.dev/database/sql) driver
+with WAL mode databases you should disable connection pooling by calling
 [`db.SetMaxOpenConns(1)`](https://pkg.go.dev/database/sql#DB.SetMaxOpenConns).
 
-#### POSIX Advisory Locks
+#### File Locking
 
-POSIX advisory locks, which SQLite uses, are
-[broken by design](https://www.sqlite.org/src/artifact/90c4fa?ln=1073-1161).
+POSIX advisory locks, which SQLite uses on Unix, are
+[broken by design](https://sqlite.org/src/artifact/2e8b12?ln=1073-1161).
 
 On Linux, macOS and illumos, this module uses
 [OFD locks](https://www.gnu.org/software/libc/manual/html_node/Open-File-Description-Locks.html)
 to synchronize access to database files.
-OFD locks are fully compatible with process-associated POSIX advisory locks.
+OFD locks are fully compatible with POSIX advisory locks.
 
 On BSD Unixes, this module uses
 [BSD locks](https://man.freebsd.org/cgi/man.cgi?query=flock&sektion=2).
-BSD locks may _not_ be compatible with process-associated POSIX advisory locks.
+On BSD Unixes, BSD locks are fully compatible with POSIX advisory locks.
+
+On Windows, this module uses `LockFile`, `LockFileEx`, and `UnlockFile`,
+like SQLite.
+
+On all other platforms, file locking is not supported, and you must use
+[`nolock=1`](https://sqlite.org/uri.html#urinolock)
+to open database files.
+To use the [`database/sql`](https://pkg.go.dev/database/sql) driver
+with `nolock=1` you must disable connection pooling by calling
+[`db.SetMaxOpenConns(1)`](https://pkg.go.dev/database/sql#DB.SetMaxOpenConns).
 
 #### Testing
 
-The pure Go VFS is tested by running an unmodified build of SQLite's
+The pure Go VFS is tested by running SQLite's
 [mptest](https://github.com/sqlite/sqlite/blob/master/mptest/mptest.c)
-on Linux, macOS and Windows.
+on Linux, macOS, Windows and FreeBSD.
 Performance is tested by running
 [speedtest1](https://github.com/sqlite/sqlite/blob/master/test/speedtest1.c).
 
-### Roadmap
-
-- [ ] advanced SQLite features
-  - [x] nested transactions
-  - [x] incremental BLOB I/O
-  - [x] online backup
-  - [ ] session extension
-- [ ] custom VFSes
-  - [x] custom VFS API
-  - [x] in-memory VFS
-  - [x] read-only VFS, wrapping an [`io.ReaderAt`](https://pkg.go.dev/io#ReaderAt)
-  - [ ] cloud-based VFS, based on [Cloud Backed SQLite](https://sqlite.org/cloudsqlite/doc/trunk/www/index.wiki)
-- [ ] custom SQL functions
-
 ### Alternatives
 
 - [`modernc.org/sqlite`](https://pkg.go.dev/modernc.org/sqlite)
 - [`crawshaw.io/sqlite`](https://pkg.go.dev/crawshaw.io/sqlite)
 - [`github.com/mattn/go-sqlite3`](https://pkg.go.dev/github.com/mattn/go-sqlite3)
-- [`github.com/zombiezen/go-sqlite`](https://pkg.go.dev/github.com/zombiezen/go-sqlite)
+- [`github.com/zombiezen/go-sqlite`](https://pkg.go.dev/github.com/zombiezen/go-sqlite)

backup.go

@@ -2,7 +2,7 @@ package sqlite3
 
 // Backup is an handle to an ongoing online backup operation.
 //
-// https://www.sqlite.org/c3ref/backup.html
+// https://sqlite.org/c3ref/backup.html
 type Backup struct {
 	c      *Conn
 	handle uint32
@@ -15,7 +15,7 @@ type Backup struct {
 // and blocks until the entire backup is complete.
 // Use [Conn.BackupInit] for incremental backup.
 //
-// https://www.sqlite.org/backup.html
+// https://sqlite.org/backup.html
 func (src *Conn) Backup(srcDB, dstURI string) error {
 	b, err := src.BackupInit(srcDB, dstURI)
 	if err != nil {
@@ -31,7 +31,7 @@ func (src *Conn) Backup(srcDB, dstURI string) error {
 // Restore opens the SQLite database file srcURI,
 // and blocks until the entire restore is complete.
 //
-// https://www.sqlite.org/backup.html
+// https://sqlite.org/backup.html
 func (dst *Conn) Restore(dstDB, srcURI string) error {
 	src, err := dst.openDB(srcURI, OPEN_READONLY|OPEN_URI)
 	if err != nil {
@@ -52,7 +52,7 @@ func (dst *Conn) Restore(dstDB, srcURI string) error {
 // then initializes a backup that copies the contents of srcDB on the src connection
 // to the "main" database in dstURI.
 //
-// https://www.sqlite.org/c3ref/backup_finish.html#sqlite3backupinit
+// https://sqlite.org/c3ref/backup_finish.html#sqlite3backupinit
 func (src *Conn) BackupInit(srcDB, dstURI string) (*Backup, error) {
 	dst, err := src.openDB(dstURI, OPEN_READWRITE|OPEN_CREATE|OPEN_URI)
 	if err != nil {
@@ -77,7 +77,7 @@ func (c *Conn) backupInit(dst uint32, dstName string, src uint32, srcName string
 	if r == 0 {
 		defer c.closeDB(other)
 		r = c.call(c.api.errcode, uint64(dst))
-		return nil, c.module.error(r, dst)
+		return nil, c.sqlite.error(r, dst)
 	}
 
 	return &Backup{
@@ -91,7 +91,7 @@ func (c *Conn) backupInit(dst uint32, dstName string, src uint32, srcName string
 //
 // It is safe to close a nil, zero or closed Backup.
 //
-// https://www.sqlite.org/c3ref/backup_finish.html#sqlite3backupfinish
+// https://sqlite.org/c3ref/backup_finish.html#sqlite3backupfinish
 func (b *Backup) Close() error {
 	if b == nil || b.handle == 0 {
 		return nil
@@ -106,7 +106,7 @@ func (b *Backup) Close() error {
 // Step copies up to nPage pages between the source and destination databases.
 // If nPage is negative, all remaining source pages are copied.
 //
-// https://www.sqlite.org/c3ref/backup_finish.html#sqlite3backupstep
+// https://sqlite.org/c3ref/backup_finish.html#sqlite3backupstep
 func (b *Backup) Step(nPage int) (done bool, err error) {
 	r := b.c.call(b.c.api.backupStep, uint64(b.handle), uint64(nPage))
 	if r == _DONE {
@@ -118,7 +118,7 @@ func (b *Backup) Step(nPage int) (done bool, err error) {
 // Remaining returns the number of pages still to be backed up
 // at the conclusion of the most recent [Backup.Step].
 //
-// https://www.sqlite.org/c3ref/backup_finish.html#sqlite3backupremaining
+// https://sqlite.org/c3ref/backup_finish.html#sqlite3backupremaining
 func (b *Backup) Remaining() int {
 	r := b.c.call(b.c.api.backupRemaining, uint64(b.handle))
 	return int(r)
@@ -127,7 +127,7 @@ func (b *Backup) Remaining() int {
 // PageCount returns the total number of pages in the source database
 // at the conclusion of the most recent [Backup.Step].
 //
-// https://www.sqlite.org/c3ref/backup_finish.html#sqlite3backuppagecount
+// https://sqlite.org/c3ref/backup_finish.html#sqlite3backuppagecount
 func (b *Backup) PageCount() int {
 	r := b.c.call(b.c.api.backupPageCount, uint64(b.handle))
 	return int(r)

blob.go

@@ -15,7 +15,7 @@ type ZeroBlob int64
 //
 // It implements [io.ReadWriteSeeker] for incremental BLOB I/O.
 //
-// https://www.sqlite.org/c3ref/blob.html
+// https://sqlite.org/c3ref/blob.html
 type Blob struct {
 	c      *Conn
 	bytes  int64
@@ -27,7 +27,7 @@ var _ io.ReadWriteSeeker = &Blob{}
 
 // OpenBlob opens a BLOB for incremental I/O.
 //
-// https://www.sqlite.org/c3ref/blob_open.html
+// https://sqlite.org/c3ref/blob_open.html
 func (c *Conn) OpenBlob(db, table, column string, row int64, write bool) (*Blob, error) {
 	c.checkInterrupt()
 	defer c.arena.reset()
@@ -59,7 +59,7 @@ func (c *Conn) OpenBlob(db, table, column string, row int64, write bool) (*Blob,
 //
 // It is safe to close a nil, zero or closed Blob.
 //
-// https://www.sqlite.org/c3ref/blob_close.html
+// https://sqlite.org/c3ref/blob_close.html
 func (b *Blob) Close() error {
 	if b == nil || b.handle == 0 {
 		return nil
@@ -73,14 +73,14 @@ func (b *Blob) Close() error {
 
 // Size returns the size of the BLOB in bytes.
 //
-// https://www.sqlite.org/c3ref/blob_bytes.html
+// https://sqlite.org/c3ref/blob_bytes.html
 func (b *Blob) Size() int64 {
 	return b.bytes
 }
 
 // Read implements the [io.Reader] interface.
 //
-// https://www.sqlite.org/c3ref/blob_read.html
+// https://sqlite.org/c3ref/blob_read.html
 func (b *Blob) Read(p []byte) (n int, err error) {
 	if b.offset >= b.bytes {
 		return 0, io.EOF
@@ -92,8 +92,8 @@ func (b *Blob) Read(p []byte) (n int, err error) {
 		want = avail
 	}
 
-	defer b.c.arena.reset()
-	ptr := b.c.arena.new(uint64(want))
+	ptr := b.c.new(uint64(want))
+	defer b.c.free(ptr)
 
 	r := b.c.call(b.c.api.blobRead, uint64(b.handle),
 		uint64(ptr), uint64(want), uint64(b.offset))
@@ -112,14 +112,14 @@ func (b *Blob) Read(p []byte) (n int, err error) {
 
 // WriteTo implements the [io.WriterTo] interface.
 //
-// https://www.sqlite.org/c3ref/blob_read.html
+// https://sqlite.org/c3ref/blob_read.html
 func (b *Blob) WriteTo(w io.Writer) (n int64, err error) {
 	if b.offset >= b.bytes {
 		return 0, nil
 	}
 
+	want := int64(1024 * 1024)
 	avail := b.bytes - b.offset
-	want := int64(65536)
 	if want > avail {
 		want = avail
 	}
@@ -156,10 +156,10 @@ func (b *Blob) WriteTo(w io.Writer) (n int64, err error) {
 
 // Write implements the [io.Writer] interface.
 //
-// https://www.sqlite.org/c3ref/blob_write.html
+// https://sqlite.org/c3ref/blob_write.html
 func (b *Blob) Write(p []byte) (n int, err error) {
-	defer b.c.arena.reset()
-	ptr := b.c.arena.bytes(p)
+	ptr := b.c.newBytes(p)
+	defer b.c.free(ptr)
 
 	r := b.c.call(b.c.api.blobWrite, uint64(b.handle),
 		uint64(ptr), uint64(len(p)), uint64(b.offset))
@@ -173,10 +173,13 @@ func (b *Blob) Write(p []byte) (n int, err error) {
 
 // ReadFrom implements the [io.ReaderFrom] interface.
 //
-// https://www.sqlite.org/c3ref/blob_write.html
+// https://sqlite.org/c3ref/blob_write.html
 func (b *Blob) ReadFrom(r io.Reader) (n int64, err error) {
+	want := int64(1024 * 1024)
 	avail := b.bytes - b.offset
-	want := int64(65536)
+	if l, ok := r.(*io.LimitedReader); ok && want > l.N {
+		want = l.N
+	}
 	if want > avail {
 		want = avail
 	}
@@ -238,7 +241,7 @@ func (b *Blob) Seek(offset int64, whence int) (int64, error) {
 
 // Reopen moves a BLOB handle to a new row of the same database table.
 //
-// https://www.sqlite.org/c3ref/blob_reopen.html
+// https://sqlite.org/c3ref/blob_reopen.html
 func (b *Blob) Reopen(row int64) error {
 	err := b.c.error(b.c.call(b.c.api.blobReopen, uint64(b.handle), uint64(row)))
 	b.bytes = int64(b.c.call(b.c.api.blobBytes, uint64(b.handle)))

conn.go

@@ -2,27 +2,24 @@ package sqlite3
 
 import (
 	"context"
-	"database/sql/driver"
 	"errors"
 	"fmt"
 	"net/url"
 	"runtime"
 	"strings"
-	"sync/atomic"
-	"unsafe"
 
 	"github.com/ncruces/go-sqlite3/internal/util"
+	"github.com/tetratelabs/wazero/api"
 )
 
 // Conn is a database connection handle.
 // A Conn is not safe for concurrent use by multiple goroutines.
 //
-// https://www.sqlite.org/c3ref/sqlite3.html
+// https://sqlite.org/c3ref/sqlite3.html
 type Conn struct {
-	*module
+	*sqlite
 
 	interrupt context.Context
-	waiter    chan struct{}
 	pending   *Stmt
 	arena     arena
 
@@ -39,9 +36,9 @@ func Open(filename string) (*Conn, error) {
 // If none of the required flags is used, a combination of [OPEN_READWRITE] and [OPEN_CREATE] is used.
 // If a URI filename is used, PRAGMA statements to execute can be specified using "_pragma":
 //
-//	sqlite3.Open("file:demo.db?_pragma=busy_timeout(10000)&_pragma=locking_mode(normal)")
+//	sqlite3.Open("file:demo.db?_pragma=busy_timeout(10000)")
 //
-// https://www.sqlite.org/c3ref/open.html
+// https://sqlite.org/c3ref/open.html
 func OpenFlags(filename string, flags OpenFlag) (*Conn, error) {
 	if flags&(OPEN_READONLY|OPEN_READWRITE|OPEN_CREATE) == 0 {
 		flags |= OPEN_READWRITE | OPEN_CREATE
@@ -49,21 +46,24 @@ func OpenFlags(filename string, flags OpenFlag) (*Conn, error) {
 	return newConn(filename, flags)
 }
 
+type connKey struct{}
+
 func newConn(filename string, flags OpenFlag) (conn *Conn, err error) {
-	mod, err := instantiateModule()
+	sqlite, err := instantiateSQLite()
 	if err != nil {
 		return nil, err
 	}
 	defer func() {
 		if conn == nil {
-			mod.close()
+			sqlite.close()
 		} else {
 			runtime.SetFinalizer(conn, util.Finalizer[Conn](3))
 		}
 	}()
 
-	c := &Conn{module: mod}
+	c := &Conn{sqlite: sqlite}
 	c.arena = c.newArena(1024)
+	c.ctx = context.WithValue(c.ctx, connKey{}, c)
 	c.handle, err = c.openDB(filename, flags)
 	if err != nil {
 		return nil, err
@@ -80,7 +80,7 @@ func (c *Conn) openDB(filename string, flags OpenFlag) (uint32, error) {
 	r := c.call(c.api.open, uint64(namePtr), uint64(connPtr), uint64(flags), 0)
 
 	handle := util.ReadUint32(c.mod, connPtr)
-	if err := c.module.error(r, handle); err != nil {
+	if err := c.sqlite.error(r, handle); err != nil {
 		c.closeDB(handle)
 		return 0, err
 	}
@@ -99,7 +99,7 @@ func (c *Conn) openDB(filename string, flags OpenFlag) (uint32, error) {
 		c.arena.reset()
 		pragmaPtr := c.arena.string(pragmas.String())
 		r := c.call(c.api.exec, uint64(handle), uint64(pragmaPtr), 0, 0, 0)
-		if err := c.module.error(r, handle, pragmas.String()); err != nil {
+		if err := c.sqlite.error(r, handle, pragmas.String()); err != nil {
 			if errors.Is(err, ERROR) {
 				err = fmt.Errorf("sqlite3: invalid _pragma: %w", err)
 			}
@@ -113,7 +113,7 @@ func (c *Conn) openDB(filename string, flags OpenFlag) (uint32, error) {
 
 func (c *Conn) closeDB(handle uint32) {
 	r := c.call(c.api.closeZombie, uint64(handle))
-	if err := c.module.error(r, handle); err != nil {
+	if err := c.sqlite.error(r, handle); err != nil {
 		panic(err)
 	}
 }
@@ -126,13 +126,12 @@ func (c *Conn) closeDB(handle uint32) {
 //
 // It is safe to close a nil, zero or closed Conn.
 //
-// https://www.sqlite.org/c3ref/close.html
+// https://sqlite.org/c3ref/close.html
 func (c *Conn) Close() error {
 	if c == nil || c.handle == 0 {
 		return nil
 	}
 
-	c.SetInterrupt(context.Background())
 	c.pending.Close()
 	c.pending = nil
 
@@ -143,13 +142,13 @@ func (c *Conn) Close() error {
 
 	c.handle = 0
 	runtime.SetFinalizer(c, nil)
-	return c.module.close()
+	return c.close()
 }
 
 // Exec is a convenience function that allows an application to run
 // multiple statements of SQL without having to use a lot of code.
 //
-// https://www.sqlite.org/c3ref/exec.html
+// https://sqlite.org/c3ref/exec.html
 func (c *Conn) Exec(sql string) error {
 	c.checkInterrupt()
 	defer c.arena.reset()
@@ -169,8 +168,11 @@ func (c *Conn) Prepare(sql string) (stmt *Stmt, tail string, err error) {
 // If the input text contains no SQL (if the input is an empty string or a comment),
 // both stmt and err will be nil.
 //
-// https://www.sqlite.org/c3ref/prepare.html
+// https://sqlite.org/c3ref/prepare.html
 func (c *Conn) PrepareFlags(sql string, flags PrepareFlag) (stmt *Stmt, tail string, err error) {
+	if len(sql) > _MAX_LENGTH {
+		return nil, "", TOOBIG
+	}
 	if emptyStatement(sql) {
 		return nil, "", nil
 	}
@@ -200,7 +202,7 @@ func (c *Conn) PrepareFlags(sql string, flags PrepareFlag) (stmt *Stmt, tail str
 
 // GetAutocommit tests the connection for auto-commit mode.
 //
-// https://www.sqlite.org/c3ref/get_autocommit.html
+// https://sqlite.org/c3ref/get_autocommit.html
 func (c *Conn) GetAutocommit() bool {
 	r := c.call(c.api.autocommit, uint64(c.handle))
 	return r != 0
@@ -209,7 +211,7 @@ func (c *Conn) GetAutocommit() bool {
 // LastInsertRowID returns the rowid of the most recent successful INSERT
 // on the database connection.
 //
-// https://www.sqlite.org/c3ref/last_insert_rowid.html
+// https://sqlite.org/c3ref/last_insert_rowid.html
 func (c *Conn) LastInsertRowID() int64 {
 	r := c.call(c.api.lastRowid, uint64(c.handle))
 	return int64(r)
@@ -219,7 +221,7 @@ func (c *Conn) LastInsertRowID() int64 {
 // by the most recently completed INSERT, UPDATE or DELETE statement
 // on the database connection.
 //
-// https://www.sqlite.org/c3ref/changes.html
+// https://sqlite.org/c3ref/changes.html
 func (c *Conn) Changes() int64 {
 	r := c.call(c.api.changes, uint64(c.handle))
 	return int64(r)
@@ -238,72 +240,52 @@ func (c *Conn) Changes() int64 {
 //
 // SetInterrupt returns the old context assigned to the connection.
 //
-// https://www.sqlite.org/c3ref/interrupt.html
+// https://sqlite.org/c3ref/interrupt.html
 func (c *Conn) SetInterrupt(ctx context.Context) (old context.Context) {
-	// Is a waiter running?
-	if c.waiter != nil {
-		c.waiter <- struct{}{} // Cancel the waiter.
-		<-c.waiter             // Wait for it to finish.
-		c.waiter = nil
+	// Is it the same context?
+	if ctx == c.interrupt {
+		return ctx
 	}
-	// Reset the pending statement.
-	if c.pending != nil {
+
+	// An uncompleted SQL statement prevents SQLite from ignoring
+	// an interrupt that comes before any other statements are started.
+	if c.pending == nil {
+		c.pending, _, _ = c.Prepare(`SELECT 1 UNION ALL SELECT 2`)
+	} else {
 		c.pending.Reset()
 	}
 
 	old = c.interrupt
 	c.interrupt = ctx
+	// Remove the handler if the context can't be canceled.
 	if ctx == nil || ctx.Done() == nil {
+		c.call(c.api.progressHandler, uint64(c.handle), 0)
 		return old
 	}
 
-	// Creating an uncompleted SQL statement prevents SQLite from ignoring
-	// an interrupt that comes before any other statements are started.
-	if c.pending == nil {
-		c.pending, _, _ = c.Prepare(`SELECT 1 UNION ALL SELECT 2`)
-	}
 	c.pending.Step()
-
-	// Don't create the goroutine if we're already interrupted.
-	// This happens frequently while restoring to a previously interrupted state.
-	if c.checkInterrupt() {
-		return old
-	}
-
-	waiter := make(chan struct{})
-	c.waiter = waiter
-	go func() {
-		select {
-		case <-waiter: // Waiter was cancelled.
-			break
-
-		case <-ctx.Done(): // Done was closed.
-			const isInterruptedOffset = 280
-			buf := util.View(c.mod, c.handle+isInterruptedOffset, 4)
-			(*atomic.Uint32)(unsafe.Pointer(&buf[0])).Store(1)
-			// Wait for the next call to SetInterrupt.
-			<-waiter
-		}
-
-		// Signal that the waiter has finished.
-		waiter <- struct{}{}
-	}()
+	c.call(c.api.progressHandler, uint64(c.handle), 100)
 	return old
 }
 
-func (c *Conn) checkInterrupt() bool {
-	if c.interrupt == nil || c.interrupt.Err() == nil {
-		return false
+func progressCallback(ctx context.Context, mod api.Module, _ uint32) uint32 {
+	if c, ok := ctx.Value(connKey{}).(*Conn); ok {
+		if c.interrupt != nil && c.interrupt.Err() != nil {
+			return 1
+		}
+	}
+	return 0
+}
+
+func (c *Conn) checkInterrupt() {
+	if c.interrupt != nil && c.interrupt.Err() != nil {
+		c.call(c.api.interrupt, uint64(c.handle))
 	}
-	const isInterruptedOffset = 280
-	buf := util.View(c.mod, c.handle+isInterruptedOffset, 4)
-	(*atomic.Uint32)(unsafe.Pointer(&buf[0])).Store(1)
-	return true
 }
 
 // Pragma executes a PRAGMA statement and returns any results.
 //
-// https://www.sqlite.org/pragma.html
+// https://sqlite.org/pragma.html
 func (c *Conn) Pragma(str string) ([]string, error) {
 	stmt, _, err := c.Prepare(`PRAGMA ` + str)
 	if err != nil {
@@ -319,27 +301,14 @@ func (c *Conn) Pragma(str string) ([]string, error) {
 }
 
 func (c *Conn) error(rc uint64, sql ...string) error {
-	return c.module.error(rc, c.handle, sql...)
+	return c.sqlite.error(rc, c.handle, sql...)
 }
 
 // DriverConn is implemented by the SQLite [database/sql] driver connection.
 //
-// It can be used to access advanced SQLite features like
-// [savepoints], [online backup] and [incremental BLOB I/O].
+// It can be used to access SQLite features like [online backup].
 //
-// [savepoints]: https://www.sqlite.org/lang_savepoint.html
-// [online backup]: https://www.sqlite.org/backup.html
-// [incremental BLOB I/O]: https://www.sqlite.org/c3ref/blob_open.html
+// [online backup]: https://sqlite.org/backup.html
 type DriverConn interface {
-	driver.Conn
-	driver.ConnBeginTx
-	driver.ExecerContext
-	driver.ConnPrepareContext
-
-	SetInterrupt(ctx context.Context) (old context.Context)
-
-	Savepoint() Savepoint
-	Backup(srcDB, dstURI string) error
-	Restore(dstDB, srcURI string) error
-	OpenBlob(db, table, column string, row int64, write bool) (*Blob, error)
+	Raw() *Conn
 }

const.go

@@ -9,8 +9,9 @@ const (
 
 	_UTF8 = 1
 
-	_MAX_STRING = 512 // Used for short strings: names, error messages…
-
+	_MAX_NAME            = 512 // Used for short strings: names, error messages…
+	_MAX_LENGTH          = 1e9
+	_MAX_SQL_LENGTH      = 1e9
 	_MAX_ALLOCATION_SIZE = 0x7ffffeff
 
 	ptrlen = 4
@@ -18,7 +19,7 @@ const (
 
 // ErrorCode is a result code that [Error.Code] might return.
 //
-// https://www.sqlite.org/rescode.html
+// https://sqlite.org/rescode.html
 type ErrorCode uint8
 
 const (
@@ -54,7 +55,7 @@ const (
 
 // ExtendedErrorCode is a result code that [Error.ExtendedCode] might return.
 //
-// https://www.sqlite.org/rescode.html
+// https://sqlite.org/rescode.html
 type (
 	ExtendedErrorCode uint16
 	xErrorCode        = ExtendedErrorCode
@@ -97,6 +98,7 @@ const (
 	IOERR_ROLLBACK_ATOMIC   ExtendedErrorCode = xErrorCode(IOERR) | (31 << 8)
 	IOERR_DATA              ExtendedErrorCode = xErrorCode(IOERR) | (32 << 8)
 	IOERR_CORRUPTFS         ExtendedErrorCode = xErrorCode(IOERR) | (33 << 8)
+	IOERR_IN_PAGE           ExtendedErrorCode = xErrorCode(IOERR) | (34 << 8)
 	LOCKED_SHAREDCACHE      ExtendedErrorCode = xErrorCode(LOCKED) | (1 << 8)
 	LOCKED_VTAB             ExtendedErrorCode = xErrorCode(LOCKED) | (2 << 8)
 	BUSY_RECOVERY           ExtendedErrorCode = xErrorCode(BUSY) | (1 << 8)
@@ -139,7 +141,7 @@ const (
 
 // OpenFlag is a flag for the [OpenFlags] function.
 //
-// https://www.sqlite.org/c3ref/c_open_autoproxy.html
+// https://sqlite.org/c3ref/c_open_autoproxy.html
 type OpenFlag uint32
 
 const (
@@ -158,7 +160,7 @@ const (
 
 // PrepareFlag is a flag that can be passed to [Conn.PrepareFlags].
 //
-// https://www.sqlite.org/c3ref/c_prepare_normalize.html
+// https://sqlite.org/c3ref/c_prepare_normalize.html
 type PrepareFlag uint32
 
 const (
@@ -167,9 +169,21 @@ const (
 	PREPARE_NO_VTAB    PrepareFlag = 0x04
 )
 
+// FunctionFlag is a flag that can be passed to [Conn.PrepareFlags].
+//
+// https://sqlite.org/c3ref/c_deterministic.html
+type FunctionFlag uint32
+
+const (
+	DETERMINISTIC FunctionFlag = 0x000000800
+	DIRECTONLY    FunctionFlag = 0x000080000
+	SUBTYPE       FunctionFlag = 0x000100000
+	INNOCUOUS     FunctionFlag = 0x000200000
+)
+
 // Datatype is a fundamental datatype of SQLite.
 //
-// https://www.sqlite.org/c3ref/c_blob.html
+// https://sqlite.org/c3ref/c_blob.html
 type Datatype uint32
 
 const (
@@ -182,18 +196,18 @@ const (
 
 // String implements the [fmt.Stringer] interface.
 func (t Datatype) String() string {
-	const name = "INTEGERFLOATTEXTBLOBNULL"
+	const name = "INTEGERFLOATEXTBLOBNULL"
 	switch t {
 	case INTEGER:
 		return name[0:7]
 	case FLOAT:
 		return name[7:12]
 	case TEXT:
-		return name[12:16]
+		return name[11:15]
 	case BLOB:
-		return name[16:20]
+		return name[15:19]
 	case NULL:
-		return name[20:24]
+		return name[19:23]
 	}
 	return strconv.FormatUint(uint64(t), 10)
 }

context.go

@@ -0,0 +1,218 @@
+package sqlite3
+
+import (
+	"encoding/json"
+	"errors"
+	"math"
+	"time"
+
+	"github.com/ncruces/go-sqlite3/internal/util"
+)
+
+// Context is the context in which an SQL function executes.
+// An SQLite [Context] is in no way related to a Go [context.Context].
+//
+// https://sqlite.org/c3ref/context.html
+type Context struct {
+	c      *Conn
+	handle uint32
+}
+
+// Conn returns the database connection of the
+// [Conn.CreateFunction] or [Conn.CreateWindowFunction]
+// routines that originally registered the application defined function.
+//
+// https://sqlite.org/c3ref/context_db_handle.html
+func (ctx Context) Conn() *Conn {
+	return ctx.c
+}
+
+// SetAuxData saves metadata for argument n of the function.
+//
+// https://sqlite.org/c3ref/get_auxdata.html
+func (ctx Context) SetAuxData(n int, data any) {
+	ptr := util.AddHandle(ctx.c.ctx, data)
+	ctx.c.call(ctx.c.api.setAuxData, uint64(ctx.handle), uint64(n), uint64(ptr))
+}
+
+// GetAuxData returns metadata for argument n of the function.
+//
+// https://sqlite.org/c3ref/get_auxdata.html
+func (ctx Context) GetAuxData(n int) any {
+	ptr := uint32(ctx.c.call(ctx.c.api.getAuxData, uint64(ctx.handle), uint64(n)))
+	return util.GetHandle(ctx.c.ctx, ptr)
+}
+
+// ResultBool sets the result of the function to a bool.
+// SQLite does not have a separate boolean storage class.
+// Instead, boolean values are stored as integers 0 (false) and 1 (true).
+//
+// https://sqlite.org/c3ref/result_blob.html
+func (ctx Context) ResultBool(value bool) {
+	var i int64
+	if value {
+		i = 1
+	}
+	ctx.ResultInt64(i)
+}
+
+// ResultInt sets the result of the function to an int.
+//
+// https://sqlite.org/c3ref/result_blob.html
+func (ctx Context) ResultInt(value int) {
+	ctx.ResultInt64(int64(value))
+}
+
+// ResultInt64 sets the result of the function to an int64.
+//
+// https://sqlite.org/c3ref/result_blob.html
+func (ctx Context) ResultInt64(value int64) {
+	ctx.c.call(ctx.c.api.resultInteger,
+		uint64(ctx.handle), uint64(value))
+}
+
+// ResultFloat sets the result of the function to a float64.
+//
+// https://sqlite.org/c3ref/result_blob.html
+func (ctx Context) ResultFloat(value float64) {
+	ctx.c.call(ctx.c.api.resultFloat,
+		uint64(ctx.handle), math.Float64bits(value))
+}
+
+// ResultText sets the result of the function to a string.
+//
+// https://sqlite.org/c3ref/result_blob.html
+func (ctx Context) ResultText(value string) {
+	ptr := ctx.c.newString(value)
+	ctx.c.call(ctx.c.api.resultText,
+		uint64(ctx.handle), uint64(ptr), uint64(len(value)),
+		uint64(ctx.c.api.destructor), _UTF8)
+}
+
+// ResultRawText sets the text result of the function to a []byte.
+//
+// https://sqlite.org/c3ref/result_blob.html
+func (ctx Context) ResultRawText(value []byte) {
+	ptr := ctx.c.newBytes(value)
+	ctx.c.call(ctx.c.api.resultText,
+		uint64(ctx.handle), uint64(ptr), uint64(len(value)),
+		uint64(ctx.c.api.destructor), _UTF8)
+}
+
+// ResultBlob sets the result of the function to a []byte.
+// Returning a nil slice is the same as calling [Context.ResultNull].
+//
+// https://sqlite.org/c3ref/result_blob.html
+func (ctx Context) ResultBlob(value []byte) {
+	ptr := ctx.c.newBytes(value)
+	ctx.c.call(ctx.c.api.resultBlob,
+		uint64(ctx.handle), uint64(ptr), uint64(len(value)),
+		uint64(ctx.c.api.destructor))
+}
+
+// ResultZeroBlob sets the result of the function to a zero-filled, length n BLOB.
+//
+// https://sqlite.org/c3ref/result_blob.html
+func (ctx Context) ResultZeroBlob(n int64) {
+	ctx.c.call(ctx.c.api.resultZeroBlob,
+		uint64(ctx.handle), uint64(n))
+}
+
+// ResultNull sets the result of the function to NULL.
+//
+// https://sqlite.org/c3ref/result_blob.html
+func (ctx Context) ResultNull() {
+	ctx.c.call(ctx.c.api.resultNull,
+		uint64(ctx.handle))
+}
+
+// ResultTime sets the result of the function to a [time.Time].
+//
+// https://sqlite.org/c3ref/result_blob.html
+func (ctx Context) ResultTime(value time.Time, format TimeFormat) {
+	if format == TimeFormatDefault {
+		ctx.resultRFC3339Nano(value)
+		return
+	}
+	switch v := format.Encode(value).(type) {
+	case string:
+		ctx.ResultText(v)
+	case int64:
+		ctx.ResultInt64(v)
+	case float64:
+		ctx.ResultFloat(v)
+	default:
+		panic(util.AssertErr())
+	}
+}
+
+func (ctx Context) resultRFC3339Nano(value time.Time) {
+	const maxlen = uint64(len(time.RFC3339Nano)) + 5
+
+	ptr := ctx.c.new(maxlen)
+	buf := util.View(ctx.c.mod, ptr, maxlen)
+	buf = value.AppendFormat(buf[:0], time.RFC3339Nano)
+
+	ctx.c.call(ctx.c.api.resultText,
+		uint64(ctx.handle), uint64(ptr), uint64(len(buf)),
+		uint64(ctx.c.api.destructor), _UTF8)
+}
+
+// ResultPointer sets the result of the function to NULL, just like [Context.ResultNull],
+// except that it also associates ptr with that NULL value such that it can be retrieved
+// within an application-defined SQL function using [Value.Pointer].
+//
+// https://sqlite.org/c3ref/result_blob.html
+func (ctx Context) ResultPointer(ptr any) {
+	valPtr := util.AddHandle(ctx.c.ctx, ptr)
+	ctx.c.call(ctx.c.api.resultPointer, uint64(valPtr))
+}
+
+// ResultJSON sets the result of the function to the JSON encoding of value.
+//
+// https://sqlite.org/c3ref/result_blob.html
+func (ctx Context) ResultJSON(value any) {
+	data, err := json.Marshal(value)
+	if err != nil {
+		ctx.ResultError(err)
+	}
+	ctx.ResultRawText(data)
+}
+
+// ResultValue sets the result of the function to a copy of [Value].
+//
+// https://sqlite.org/c3ref/result_blob.html
+func (ctx Context) ResultValue(value Value) {
+	if value.sqlite != ctx.c.sqlite {
+		ctx.ResultError(MISUSE)
+	}
+	ctx.c.call(ctx.c.api.resultValue,
+		uint64(ctx.handle), uint64(value.handle))
+}
+
+// ResultError sets the result of the function an error.
+//
+// https://sqlite.org/c3ref/result_blob.html
+func (ctx Context) ResultError(err error) {
+	if errors.Is(err, NOMEM) {
+		ctx.c.call(ctx.c.api.resultErrorMem, uint64(ctx.handle))
+		return
+	}
+
+	if errors.Is(err, TOOBIG) {
+		ctx.c.call(ctx.c.api.resultErrorBig, uint64(ctx.handle))
+		return
+	}
+
+	msg, code := errorCode(err, _OK)
+	if msg != "" {
+		ptr := ctx.c.newString(msg)
+		ctx.c.call(ctx.c.api.resultError,
+			uint64(ctx.handle), uint64(ptr), uint64(len(msg)))
+		ctx.c.free(ptr)
+	}
+	if code != _OK {
+		ctx.c.call(ctx.c.api.resultErrorCode,
+			uint64(ctx.handle), uint64(code))
+	}
+}

driver/driver.go

@@ -14,23 +14,23 @@
 //
 // [PRAGMA] statements can be specified using "_pragma":
 //
-//	sql.Open("sqlite3", "file:demo.db?_pragma=busy_timeout(10000)&_pragma=locking_mode(normal)")
+//	sql.Open("sqlite3", "file:demo.db?_pragma=busy_timeout(10000)")
 //
-// If no PRAGMAs are specified, a busy timeout of 1 minute
-// and normal locking mode are used.
+// If no PRAGMAs are specified, a busy timeout of 1 minute is set.
 //
 // Order matters:
 // busy timeout and locking mode should be the first PRAGMAs set, in that order.
 //
-// [URI]: https://www.sqlite.org/uri.html
-// [PRAGMA]: https://www.sqlite.org/pragma.html
-// [TRANSACTION]: https://www.sqlite.org/lang_transaction.html#deferred_immediate_and_exclusive_transactions
+// [URI]: https://sqlite.org/uri.html
+// [PRAGMA]: https://sqlite.org/pragma.html
+// [TRANSACTION]: https://sqlite.org/lang_transaction.html#deferred_immediate_and_exclusive_transactions
 package driver
 
 import (
 	"context"
 	"database/sql"
 	"database/sql/driver"
+	"errors"
 	"fmt"
 	"io"
 	"net/url"
@@ -41,64 +41,117 @@ import (
 	"github.com/ncruces/go-sqlite3/internal/util"
 )
 
+// This variable can be replaced with -ldflags:
+//
+//	go build -ldflags="-X github.com/ncruces/go-sqlite3.driverName=sqlite"
+var driverName = "sqlite3"
+
 func init() {
-	sql.Register("sqlite3", sqlite{})
+	if driverName != "" {
+		sql.Register(driverName, sqlite{})
+	}
+}
+
+// Open opens the SQLite database specified by dataSourceName as a [database/sql.DB].
+//
+// The init function is called by the driver on new connections.
+// The conn can be used to execute queries, register functions, etc.
+// Any error return closes the conn and passes the error to [database/sql].
+func Open(dataSourceName string, init func(*sqlite3.Conn) error) (*sql.DB, error) {
+	c, err := newConnector(dataSourceName, init)
+	if err != nil {
+		return nil, err
+	}
+	return sql.OpenDB(c), nil
 }
 
 type sqlite struct{}
 
-func (sqlite) Open(name string) (_ driver.Conn, err error) {
-	var c conn
-	c.Conn, err = sqlite3.Open(name)
+func (sqlite) Open(name string) (driver.Conn, error) {
+	c, err := newConnector(name, nil)
 	if err != nil {
 		return nil, err
 	}
+	return c.Connect(context.Background())
+}
 
-	var pragmas []string
+func (sqlite) OpenConnector(name string) (driver.Connector, error) {
+	return newConnector(name, nil)
+}
+
+func newConnector(name string, init func(*sqlite3.Conn) error) (*connector, error) {
+	c := connector{name: name, init: init}
 	if strings.HasPrefix(name, "file:") {
 		if _, after, ok := strings.Cut(name, "?"); ok {
-			query, _ := url.ParseQuery(after)
-
-			switch s := query.Get("_txlock"); s {
-			case "":
-				c.txBegin = "BEGIN"
-			case "deferred", "immediate", "exclusive":
-				c.txBegin = "BEGIN " + s
-			default:
-				c.Close()
-				return nil, fmt.Errorf("sqlite3: invalid _txlock: %s", s)
+			query, err := url.ParseQuery(after)
+			if err != nil {
+				return nil, err
 			}
-
-			pragmas = query["_pragma"]
+			c.txlock = query.Get("_txlock")
+			c.pragmas = len(query["_pragma"]) > 0
 		}
 	}
-	if len(pragmas) == 0 {
-		err := c.Conn.Exec(`
-			PRAGMA busy_timeout=60000;
-			PRAGMA locking_mode=normal;
-		`)
+	return &c, nil
+}
+
+type connector struct {
+	init    func(*sqlite3.Conn) error
+	name    string
+	txlock  string
+	pragmas bool
+}
+
+func (n *connector) Driver() driver.Driver {
+	return sqlite{}
+}
+
+func (n *connector) Connect(ctx context.Context) (_ driver.Conn, err error) {
+	var c conn
+	c.Conn, err = sqlite3.Open(n.name)
+	if err != nil {
+		return nil, err
+	}
+	defer func() {
 		if err != nil {
 			c.Close()
-			return nil, err
 		}
-		c.reusable = true
-	} else {
-		s, _, err := c.Conn.Prepare(`
-			SELECT * FROM
-				PRAGMA_locking_mode,
-				PRAGMA_query_only;
-		`)
+	}()
+
+	old := c.Conn.SetInterrupt(ctx)
+	defer c.Conn.SetInterrupt(old)
+
+	switch n.txlock {
+	case "":
+		c.txBegin = "BEGIN"
+	case "deferred", "immediate", "exclusive":
+		c.txBegin = "BEGIN " + n.txlock
+	default:
+		return nil, fmt.Errorf("sqlite3: invalid _txlock: %s", n.txlock)
+	}
+	if !n.pragmas {
+		err = c.Conn.Exec(`PRAGMA busy_timeout=60000`)
 		if err != nil {
-			c.Close()
 			return nil, err
 		}
-		if s.Step() {
-			c.reusable = s.ColumnText(0) == "normal"
-			c.readOnly = s.ColumnRawText(1)[0] // 0 or 1
+	}
+	if n.init != nil {
+		err = n.init(c.Conn)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if n.pragmas || n.init != nil {
+		s, _, err := c.Conn.Prepare(`PRAGMA query_only`)
+		if err != nil {
+			return nil, err
+		}
+		if s.Step() && s.ColumnBool(0) {
+			c.readOnly = '1'
+		} else {
+			c.readOnly = '0'
 		}
 		err = s.Close()
 		if err != nil {
-			c.Close()
 			return nil, err
 		}
 	}
@@ -110,20 +163,19 @@ type conn struct {
 	txBegin    string
 	txCommit   string
 	txRollback string
-	reusable   bool
 	readOnly   byte
 }
 
 var (
 	// Ensure these interfaces are implemented:
-	_ driver.ExecerContext = &conn{}
-	_ driver.ConnBeginTx   = &conn{}
-	_ driver.Validator     = &conn{}
-	_ sqlite3.DriverConn   = &conn{}
+	_ driver.ConnPrepareContext = &conn{}
+	_ driver.ExecerContext      = &conn{}
+	_ driver.ConnBeginTx        = &conn{}
+	_ sqlite3.DriverConn        = &conn{}
 )
 
-func (c *conn) IsValid() bool {
-	return c.reusable
+func (c *conn) Raw() *sqlite3.Conn {
+	return c.Conn
 }
 
 func (c *conn) Begin() (driver.Tx, error) {
@@ -139,10 +191,10 @@ func (c *conn) BeginTx(ctx context.Context, opts driver.TxOptions) (driver.Tx, e
 		txBegin = `
 			BEGIN deferred;
 			PRAGMA query_only=on`
-		c.txCommit = `
+		c.txRollback = `
 			ROLLBACK;
 			PRAGMA query_only=` + string(c.readOnly)
-		c.txRollback = c.txCommit
+		c.txCommit = c.txRollback
 	}
 
 	switch opts.Isolation {
@@ -166,14 +218,20 @@ func (c *conn) BeginTx(ctx context.Context, opts driver.TxOptions) (driver.Tx, e
 
 func (c *conn) Commit() error {
 	err := c.Conn.Exec(c.txCommit)
-	if err != nil && !c.GetAutocommit() {
+	if err != nil && !c.Conn.GetAutocommit() {
 		c.Rollback()
 	}
 	return err
 }
 
 func (c *conn) Rollback() error {
-	return c.Conn.Exec(c.txRollback)
+	err := c.Conn.Exec(c.txRollback)
+	if errors.Is(err, sqlite3.INTERRUPT) {
+		old := c.Conn.SetInterrupt(context.Background())
+		defer c.Conn.SetInterrupt(old)
+		err = c.Conn.Exec(c.txRollback)
+	}
+	return err
 }
 
 func (c *conn) Prepare(query string) (driver.Stmt, error) {
@@ -210,6 +268,12 @@ func (c *conn) ExecContext(ctx context.Context, query string, args []driver.Name
 		return nil, driver.ErrSkip
 	}
 
+	if savept, ok := ctx.(*saveptCtx); ok {
+		// Called from driver.Savepoint.
+		savept.Savepoint = c.Savepoint()
+		return resultRowsAffected(0), nil
+	}
+
 	old := c.Conn.SetInterrupt(ctx)
 	defer c.Conn.SetInterrupt(old)
 
@@ -221,6 +285,10 @@ func (c *conn) ExecContext(ctx context.Context, query string, args []driver.Name
 	return newResult(c.Conn), nil
 }
 
+func (*conn) CheckNamedValue(arg *driver.NamedValue) error {
+	return nil
+}
+
 type stmt struct {
 	Stmt *sqlite3.Stmt
 	Conn *sqlite3.Conn
@@ -258,13 +326,14 @@ func (s *stmt) Query(args []driver.Value) (driver.Rows, error) {
 }
 
 func (s *stmt) ExecContext(ctx context.Context, args []driver.NamedValue) (driver.Result, error) {
-	// Use QueryContext to setup bindings.
-	// No need to close rows: that simply resets the statement, exec does the same.
-	_, err := s.QueryContext(ctx, args)
+	err := s.setupBindings(args)
 	if err != nil {
 		return nil, err
 	}
 
+	old := s.Conn.SetInterrupt(ctx)
+	defer s.Conn.SetInterrupt(old)
+
 	err = s.Stmt.Exec()
 	if err != nil {
 		return nil, err
@@ -274,10 +343,18 @@ func (s *stmt) ExecContext(ctx context.Context, args []driver.NamedValue) (drive
 }
 
 func (s *stmt) QueryContext(ctx context.Context, args []driver.NamedValue) (driver.Rows, error) {
-	err := s.Stmt.ClearBindings()
+	err := s.setupBindings(args)
 	if err != nil {
 		return nil, err
 	}
+	return &rows{ctx, s.Stmt, s.Conn}, nil
+}
+
+func (s *stmt) setupBindings(args []driver.NamedValue) error {
+	err := s.Stmt.ClearBindings()
+	if err != nil {
+		return err
+	}
 
 	var ids [3]int
 	for _, arg := range args {
@@ -310,6 +387,10 @@ func (s *stmt) QueryContext(ctx context.Context, args []driver.NamedValue) (driv
 				err = s.Stmt.BindZeroBlob(id, int64(a))
 			case time.Time:
 				err = s.Stmt.BindTime(id, a, sqlite3.TimeFormatDefault)
+			case interface{ Pointer() any }:
+				err = s.Stmt.BindPointer(id, a.Pointer())
+			case interface{ JSON() any }:
+				err = s.Stmt.BindJSON(id, a.JSON())
 			case nil:
 				err = s.Stmt.BindNull(id)
 			default:
@@ -317,17 +398,19 @@ func (s *stmt) QueryContext(ctx context.Context, args []driver.NamedValue) (driv
 			}
 		}
 		if err != nil {
-			return nil, err
+			return err
 		}
 	}
-
-	return &rows{ctx, s.Stmt, s.Conn}, nil
+	return nil
 }
 
 func (s *stmt) CheckNamedValue(arg *driver.NamedValue) error {
 	switch arg.Value.(type) {
 	case bool, int, int64, float64, string, []byte,
-		sqlite3.ZeroBlob, time.Time, nil:
+		sqlite3.ZeroBlob, time.Time,
+		interface{ Pointer() any },
+		interface{ JSON() any },
+		nil:
 		return nil
 	default:
 		return driver.ErrSkip
@@ -406,11 +489,7 @@ func (r *rows) Next(dest []driver.Value) error {
 		case sqlite3.TEXT:
 			dest[i] = stringOrTime(r.Stmt.ColumnRawText(i))
 		case sqlite3.NULL:
-			if buf, ok := dest[i].([]byte); ok {
-				dest[i] = buf[0:0]
-			} else {
-				dest[i] = nil
-			}
+			dest[i] = nil
 		default:
 			panic(util.AssertErr())
 		}

driver/driver_test.go

@@ -11,6 +11,7 @@ import (
 	"time"
 
 	"github.com/ncruces/go-sqlite3"
+	_ "github.com/ncruces/go-sqlite3/embed"
 	"github.com/ncruces/go-sqlite3/internal/util"
 )
 
@@ -296,6 +297,7 @@ func Test_QueryRow_blob_null(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
+	defer rows.Close()
 
 	want := [][]byte{nil, {0xca, 0xfe}, {0xba, 0xbe}, nil}
 	for i := 0; rows.Next(); i++ {

driver/json_test.go

@@ -0,0 +1,65 @@
+package driver_test
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/ncruces/go-sqlite3"
+	"github.com/ncruces/go-sqlite3/driver"
+	_ "github.com/ncruces/go-sqlite3/embed"
+	_ "github.com/ncruces/go-sqlite3/vfs/memdb"
+)
+
+func Example_json() {
+	db, err := driver.Open("file:/test.db?vfs=memdb", nil)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer db.Close()
+
+	_, err = db.Exec(`
+		CREATE TABLE IF NOT EXISTS orders (
+			cart_id INTEGER PRIMARY KEY,
+			user_id INTEGER NOT NULL,
+			cart    TEXT
+		);
+	`)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	type CartItem struct {
+		ItemID   string `json:"id"`
+		Name     string `json:"name"`
+		Quantity int    `json:"quantity,omitempty"`
+		Price    int    `json:"price,omitempty"`
+	}
+
+	type Cart struct {
+		Items []CartItem `json:"items"`
+	}
+
+	_, err = db.Exec(`INSERT INTO orders (user_id, cart) VALUES (?, ?)`, 123, sqlite3.JSON(Cart{
+		[]CartItem{
+			{ItemID: "111", Name: "T-shirt", Quantity: 1, Price: 250},
+			{ItemID: "222", Name: "Trousers", Quantity: 1, Price: 600},
+		},
+	}))
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	var total string
+	err = db.QueryRow(`
+		SELECT total(json_each.value -> 'price')
+		FROM orders, json_each(cart -> 'items')
+		WHERE cart_id = last_insert_rowid()
+	`).Scan(&total)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	fmt.Println("total:", total)
+	// Output:
+	// total: 850
+}

driver/savepoint.go

@@ -0,0 +1,27 @@
+package driver
+
+import (
+	"database/sql"
+	"time"
+
+	"github.com/ncruces/go-sqlite3"
+)
+
+// Savepoint establishes a new transaction savepoint.
+//
+// https://sqlite.org/lang_savepoint.html
+func Savepoint(tx *sql.Tx) sqlite3.Savepoint {
+	var ctx saveptCtx
+	tx.ExecContext(&ctx, "")
+	return ctx.Savepoint
+}
+
+type saveptCtx struct{ sqlite3.Savepoint }
+
+func (*saveptCtx) Deadline() (deadline time.Time, ok bool) { return }
+
+func (*saveptCtx) Done() <-chan struct{} { return nil }
+
+func (*saveptCtx) Err() error { return nil }
+
+func (*saveptCtx) Value(key any) any { return nil }

driver/savepoint_test.go

@@ -0,0 +1,88 @@
+package driver_test
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/ncruces/go-sqlite3/driver"
+	_ "github.com/ncruces/go-sqlite3/embed"
+	_ "github.com/ncruces/go-sqlite3/vfs/memdb"
+)
+
+func ExampleSavepoint() {
+	db, err := driver.Open("file:/test.db?vfs=memdb", nil)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer db.Close()
+
+	_, err = db.Exec(`CREATE TABLE IF NOT EXISTS users (id INT, name VARCHAR(10))`)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	err = func() error {
+		tx, err := db.Begin()
+		if err != nil {
+			return err
+		}
+		defer tx.Rollback()
+
+		stmt, err := tx.Prepare(`INSERT INTO users (id, name) VALUES (?, ?)`)
+		if err != nil {
+			return err
+		}
+		defer stmt.Close()
+
+		_, err = stmt.Exec(0, "go")
+		if err != nil {
+			return err
+		}
+
+		_, err = stmt.Exec(1, "zig")
+		if err != nil {
+			return err
+		}
+
+		savept := driver.Savepoint(tx)
+
+		_, err = stmt.Exec(2, "whatever")
+		if err != nil {
+			return err
+		}
+
+		err = savept.Rollback()
+		if err != nil {
+			return err
+		}
+
+		_, err = stmt.Exec(3, "rust")
+		if err != nil {
+			return err
+		}
+
+		return tx.Commit()
+	}()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	rows, err := db.Query(`SELECT id, name FROM users`)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var id, name string
+		err = rows.Scan(&id, &name)
+		if err != nil {
+			log.Fatal(err)
+		}
+		fmt.Printf("%s %s\n", id, name)
+	}
+	// Output:
+	// 0 go
+	// 1 zig
+	// 3 rust
+}

driver/time_test.go

@@ -58,7 +58,7 @@ func Fuzz_stringOrTime_2(f *testing.F) {
 	f.Add(639095955742, 222_222_222)  // twosday, year 22222AD
 	f.Add(-763421161058, 222_222_222) // twosday, year 22222BC
 
-	checkTime := func(t *testing.T, date time.Time) {
+	checkTime := func(t testing.TB, date time.Time) {
 		value := stringOrTime([]byte(date.Format(time.RFC3339Nano)))
 
 		switch v := value.(type) {

driver_test.go

@@ -1,75 +0,0 @@
-package sqlite3_test
-
-import (
-	"context"
-	"database/sql"
-	"fmt"
-	"log"
-	"os"
-
-	"github.com/ncruces/go-sqlite3"
-	_ "github.com/ncruces/go-sqlite3/driver"
-	_ "github.com/ncruces/go-sqlite3/embed"
-)
-
-var db *sql.DB
-
-func ExampleDriverConn() {
-	var err error
-	db, err = sql.Open("sqlite3", "demo.db")
-	if err != nil {
-		log.Fatal(err)
-	}
-	defer os.Remove("demo.db")
-	defer db.Close()
-
-	ctx := context.Background()
-
-	conn, err := db.Conn(ctx)
-	if err != nil {
-		log.Fatal(err)
-	}
-	defer conn.Close()
-
-	_, err = conn.ExecContext(ctx, `CREATE TABLE IF NOT EXISTS test (col)`)
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	res, err := conn.ExecContext(ctx, `INSERT INTO test VALUES (?)`, sqlite3.ZeroBlob(11))
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	id, err := res.LastInsertId()
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	err = conn.Raw(func(driverConn any) error {
-		conn := driverConn.(sqlite3.DriverConn)
-		savept := conn.Savepoint()
-		defer savept.Release(&err)
-
-		blob, err := conn.OpenBlob("main", "test", "col", id, true)
-		if err != nil {
-			return err
-		}
-		defer blob.Close()
-
-		_, err = fmt.Fprint(blob, "Hello BLOB!")
-		return err
-	})
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	var msg string
-	err = conn.QueryRowContext(ctx, `SELECT col FROM test`).Scan(&msg)
-	if err != nil {
-		log.Fatal(err)
-	}
-	fmt.Println(msg)
-	// Output:
-	// Hello BLOB!
-}

embed/README.md

@@ -1,14 +1,15 @@
 # Embeddable WASM build of SQLite
 
-This folder includes an embeddable WASM build of SQLite 3.42.0 for use with
+This folder includes an embeddable WASM build of SQLite 3.44.2 for use with
 [`github.com/ncruces/go-sqlite3`](https://pkg.go.dev/github.com/ncruces/go-sqlite3).
 
 The following optional features are compiled in:
-- [math functions](https://www.sqlite.org/lang_mathfunc.html)
-- [FTS3/4](https://www.sqlite.org/fts3.html)/[5](https://www.sqlite.org/fts5.html)
-- [JSON](https://www.sqlite.org/json1.html)
-- [R*Tree](https://www.sqlite.org/rtree.html)
-- [GeoPoly](https://www.sqlite.org/geopoly.html)
+- [math functions](https://sqlite.org/lang_mathfunc.html)
+- [FTS3/4](https://sqlite.org/fts3.html)/[5](https://sqlite.org/fts5.html)
+- [JSON](https://sqlite.org/json1.html)
+- [R*Tree](https://sqlite.org/rtree.html)
+- [GeoPoly](https://sqlite.org/geopoly.html)
+- [soundex](https://sqlite.org/lang_corefunc.html#soundex)
 - [base64](https://github.com/sqlite/sqlite/blob/master/ext/misc/base64.c)
 - [decimal](https://github.com/sqlite/sqlite/blob/master/ext/misc/decimal.c)
 - [regexp](https://github.com/sqlite/sqlite/blob/master/ext/misc/regexp.c)

embed/build.sh

@@ -4,24 +4,27 @@ set -euo pipefail
 cd -P -- "$(dirname -- "$0")"
 
 ROOT=../
-BINARYEN="$ROOT/tools/binaryen-version_113/bin"
+BINARYEN="$ROOT/tools/binaryen-version_116/bin"
 WASI_SDK="$ROOT/tools/wasi-sdk-20.0/bin"
 
 "$WASI_SDK/clang" --target=wasm32-wasi -flto -g0 -O2 \
 	-o sqlite3.wasm "$ROOT/sqlite3/main.c" \
 	-I"$ROOT/sqlite3" \
 	-mexec-model=reactor \
-	-mmutable-globals \
+	-msimd128 -mmutable-globals \
 	-mbulk-memory -mreference-types \
 	-mnontrapping-fptoint -msign-ext \
+	-fno-stack-protector -fno-stack-clash-protection \
 	-Wl,--initial-memory=327680 \
 	-Wl,--stack-first \
 	-Wl,--import-undefined \
+	-D_HAVE_SQLITE_CONFIG_H \
 	$(awk '{print "-Wl,--export="$0}' exports.txt)
 
 trap 'rm -f sqlite3.tmp' EXIT
 "$BINARYEN/wasm-ctor-eval" -g -c _initialize sqlite3.wasm -o sqlite3.tmp
-"$BINARYEN/wasm-opt" -g -O2 sqlite3.tmp -o sqlite3.wasm \
-	--enable-multivalue --enable-mutable-globals \
+"$BINARYEN/wasm-opt" -g --strip -c -O3 \
+	sqlite3.tmp -o sqlite3.wasm \
+	--enable-simd --enable-mutable-globals --enable-multivalue \
 	--enable-bulk-memory --enable-reference-types \
 	--enable-nontrapping-float-to-int --enable-sign-ext

embed/exports.txt

@@ -13,6 +13,8 @@ sqlite3_finalize
 sqlite3_reset
 sqlite3_step
 sqlite3_exec
+sqlite3_interrupt
+sqlite3_progress_handler_go
 sqlite3_clear_bindings
 sqlite3_bind_parameter_count
 sqlite3_bind_parameter_index
@@ -23,6 +25,7 @@ sqlite3_bind_double
 sqlite3_bind_text64
 sqlite3_bind_blob64
 sqlite3_bind_zeroblob64
+sqlite3_bind_pointer_go
 sqlite3_column_count
 sqlite3_column_name
 sqlite3_column_type
@@ -33,10 +36,10 @@ sqlite3_column_blob
 sqlite3_column_bytes
 sqlite3_blob_open
 sqlite3_blob_close
+sqlite3_blob_reopen
 sqlite3_blob_bytes
 sqlite3_blob_read
 sqlite3_blob_write
-sqlite3_blob_reopen
 sqlite3_backup_init
 sqlite3_backup_step
 sqlite3_backup_finish
@@ -46,4 +49,43 @@ sqlite3_uri_parameter
 sqlite3_uri_key
 sqlite3_changes64
 sqlite3_last_insert_rowid
-sqlite3_get_autocommit
+sqlite3_get_autocommit
+sqlite3_anycollseq_init
+sqlite3_create_collation_go
+sqlite3_create_function_go
+sqlite3_create_aggregate_function_go
+sqlite3_create_window_function_go
+sqlite3_aggregate_context
+sqlite3_user_data
+sqlite3_set_auxdata_go
+sqlite3_get_auxdata
+sqlite3_value_type
+sqlite3_value_int64
+sqlite3_value_double
+sqlite3_value_text
+sqlite3_value_blob
+sqlite3_value_bytes
+sqlite3_value_pointer_go
+sqlite3_result_null
+sqlite3_result_int64
+sqlite3_result_double
+sqlite3_result_text64
+sqlite3_result_blob64
+sqlite3_result_zeroblob64
+sqlite3_result_pointer_go
+sqlite3_result_value
+sqlite3_result_error
+sqlite3_result_error_code
+sqlite3_result_error_nomem
+sqlite3_result_error_toobig
+sqlite3_create_module_go
+sqlite3_declare_vtab
+sqlite3_vtab_config_go
+sqlite3_vtab_collation
+sqlite3_vtab_distinct
+sqlite3_vtab_in
+sqlite3_vtab_in_first
+sqlite3_vtab_in_next
+sqlite3_vtab_rhs_value
+sqlite3_vtab_nochange
+sqlite3_vtab_on_conflict

error.go

@@ -1,6 +1,7 @@
 package sqlite3
 
 import (
+	"errors"
 	"strconv"
 	"strings"
 
@@ -9,7 +10,7 @@ import (
 
 // Error wraps an SQLite Error Code.
 //
-// https://www.sqlite.org/c3ref/errcode.html
+// https://sqlite.org/c3ref/errcode.html
 type Error struct {
 	str  string
 	msg  string
@@ -19,14 +20,14 @@ type Error struct {
 
 // Code returns the primary error code for this error.
 //
-// https://www.sqlite.org/rescode.html
+// https://sqlite.org/rescode.html
 func (e *Error) Code() ErrorCode {
 	return ErrorCode(e.code)
 }
 
 // ExtendedCode returns the extended error code for this error.
 //
-// https://www.sqlite.org/rescode.html
+// https://sqlite.org/rescode.html
 func (e *Error) ExtendedCode() ExtendedErrorCode {
 	return ExtendedErrorCode(e.code)
 }
@@ -68,6 +69,19 @@ func (e *Error) Is(err error) bool {
 	return false
 }
 
+// As converts this error to an [ErrorCode] or [ExtendedErrorCode].
+func (e *Error) As(err any) bool {
+	switch c := err.(type) {
+	case *ErrorCode:
+		*c = e.Code()
+		return true
+	case *ExtendedErrorCode:
+		*c = e.ExtendedCode()
+		return true
+	}
+	return false
+}
+
 // Temporary returns true for [BUSY] errors.
 func (e *Error) Temporary() bool {
 	return e.Code() == BUSY
@@ -104,6 +118,15 @@ func (e ExtendedErrorCode) Is(err error) bool {
 	return ok && c == ErrorCode(e)
 }
 
+// As converts this error to an [ErrorCode].
+func (e ExtendedErrorCode) As(err any) bool {
+	c, ok := err.(*ErrorCode)
+	if ok {
+		*c = ErrorCode(e)
+	}
+	return ok
+}
+
 // Temporary returns true for [BUSY] errors.
 func (e ExtendedErrorCode) Temporary() bool {
 	return ErrorCode(e) == BUSY
@@ -113,3 +136,26 @@ func (e ExtendedErrorCode) Temporary() bool {
 func (e ExtendedErrorCode) Timeout() bool {
 	return e == BUSY_TIMEOUT
 }
+
+func errorCode(err error, def ErrorCode) (msg string, code uint32) {
+	switch code := err.(type) {
+	case ErrorCode:
+		return "", uint32(code)
+	case ExtendedErrorCode:
+		return "", uint32(code)
+	case nil:
+		return "", _OK
+	}
+
+	var ecode ErrorCode
+	var xcode xErrorCode
+	switch {
+	case errors.As(err, &xcode):
+		code = uint32(xcode)
+	case errors.As(err, &ecode):
+		code = uint32(ecode)
+	default:
+		code = uint32(def)
+	}
+	return err.Error(), code
+}

error_test.go

@@ -18,22 +18,36 @@ func Test_assertErr(t *testing.T) {
 func TestError(t *testing.T) {
 	t.Parallel()
 
-	err := Error{code: 0x8080}
-	if rc := err.Code(); rc != 0x80 {
-		t.Errorf("got %#x, want 0x80", rc)
+	var ecode ErrorCode
+	var xcode xErrorCode
+	err := &Error{code: 0x8080}
+	if !errors.As(err, &err) {
+		t.Fatal("want true")
 	}
-	if !errors.Is(&err, ErrorCode(0x80)) {
+	if ecode := err.Code(); ecode != 0x80 {
+		t.Errorf("got %#x, want 0x80", uint8(ecode))
+	}
+	if ok := errors.As(err, &ecode); !ok || ecode != ErrorCode(0x80) {
+		t.Errorf("got %#x, want 0x80", uint8(ecode))
+	}
+	if !errors.Is(err, ErrorCode(0x80)) {
 		t.Errorf("want true")
 	}
-	if rc := err.ExtendedCode(); rc != 0x8080 {
-		t.Errorf("got %#x, want 0x8080", rc)
+	if xcode := err.ExtendedCode(); xcode != 0x8080 {
+		t.Errorf("got %#x, want 0x8080", uint16(xcode))
 	}
-	if !errors.Is(&err, ExtendedErrorCode(0x8080)) {
+	if ok := errors.As(err, &xcode); !ok || xcode != xErrorCode(0x8080) {
+		t.Errorf("got %#x, want 0x8080", uint16(xcode))
+	}
+	if !errors.Is(err, xErrorCode(0x8080)) {
 		t.Errorf("want true")
 	}
 	if s := err.Error(); s != "sqlite3: 32896" {
 		t.Errorf("got %q", s)
 	}
+	if ok := errors.As(err.ExtendedCode(), &ecode); !ok || ecode != ErrorCode(0x80) {
+		t.Errorf("got %#x, want 0x80", uint8(ecode))
+	}
 	if !errors.Is(err.ExtendedCode(), ErrorCode(0x80)) {
 		t.Errorf("want true")
 	}
@@ -122,7 +136,7 @@ func Test_ErrorCode_Error(t *testing.T) {
 	for i := 0; i == int(ErrorCode(i)); i++ {
 		want := "sqlite3: "
 		r := db.call(db.api.errstr, uint64(i))
-		want += util.ReadString(db.mod, uint32(r), _MAX_STRING)
+		want += util.ReadString(db.mod, uint32(r), _MAX_NAME)
 
 		got := ErrorCode(i).Error()
 		if got != want {
@@ -144,7 +158,7 @@ func Test_ExtendedErrorCode_Error(t *testing.T) {
 	for i := 0; i == int(ExtendedErrorCode(i)); i++ {
 		want := "sqlite3: "
 		r := db.call(db.api.errstr, uint64(i))
-		want += util.ReadString(db.mod, uint32(r), _MAX_STRING)
+		want += util.ReadString(db.mod, uint32(r), _MAX_NAME)
 
 		got := ExtendedErrorCode(i).Error()
 		if got != want {

ext/array/array.go

@@ -0,0 +1,135 @@
+// Package array provides the array table-valued SQL function.
+package array
+
+import (
+	"fmt"
+	"reflect"
+
+	"github.com/ncruces/go-sqlite3"
+)
+
+// Register registers the array single-argument, table-valued SQL function.
+// The argument must be an [sqlite3.Pointer] to a Go slice or array
+// of ints, floats, bools, strings or blobs.
+//
+// https://sqlite.org/carray.html
+func Register(db *sqlite3.Conn) {
+	sqlite3.CreateModule[array](db, "array", nil,
+		func(db *sqlite3.Conn, arg ...string) (array, error) {
+			err := db.DeclareVtab(`CREATE TABLE x(value, array HIDDEN)`)
+			return array{}, err
+		})
+}
+
+type array struct{}
+
+func (array) BestIndex(idx *sqlite3.IndexInfo) error {
+	for i, cst := range idx.Constraint {
+		if cst.Column == 1 && cst.Op == sqlite3.INDEX_CONSTRAINT_EQ && cst.Usable {
+			idx.ConstraintUsage[i] = sqlite3.IndexConstraintUsage{
+				Omit:      true,
+				ArgvIndex: 1,
+			}
+			idx.EstimatedCost = 1
+			idx.EstimatedRows = 100
+			return nil
+		}
+	}
+	return sqlite3.CONSTRAINT
+}
+
+func (array) Open() (sqlite3.VTabCursor, error) {
+	return &cursor{}, nil
+}
+
+type cursor struct {
+	array reflect.Value
+	rowID int
+}
+
+func (c *cursor) EOF() bool {
+	return c.rowID >= c.array.Len()
+}
+
+func (c *cursor) Next() error {
+	c.rowID++
+	return nil
+}
+
+func (c *cursor) RowID() (int64, error) {
+	return int64(c.rowID), nil
+}
+
+func (c *cursor) Column(ctx *sqlite3.Context, n int) error {
+	if n != 0 {
+		return nil
+	}
+
+	v := c.array.Index(c.rowID)
+	k := v.Kind()
+
+	if k == reflect.Interface {
+		if v.IsNil() {
+			ctx.ResultNull()
+			return nil
+		}
+		v = v.Elem()
+		k = v.Kind()
+	}
+
+	switch {
+	case v.CanInt():
+		ctx.ResultInt64(v.Int())
+
+	case v.CanUint():
+		i64 := int64(v.Uint())
+		if i64 < 0 {
+			return fmt.Errorf("array: integer element overflow:%.0w %d", sqlite3.MISMATCH, v.Uint())
+		}
+		ctx.ResultInt64(i64)
+
+	case v.CanFloat():
+		ctx.ResultFloat(v.Float())
+
+	case k == reflect.Bool:
+		ctx.ResultBool(v.Bool())
+
+	case k == reflect.String:
+		ctx.ResultText(v.String())
+
+	case (k == reflect.Slice || k == reflect.Array && v.CanAddr()) &&
+		v.Type().Elem().Kind() == reflect.Uint8:
+		ctx.ResultBlob(v.Bytes())
+
+	default:
+		return fmt.Errorf("array: unsupported element:%.0w %v", sqlite3.MISMATCH, v.Type())
+	}
+	return nil
+}
+
+func (c *cursor) Filter(idxNum int, idxStr string, arg ...sqlite3.Value) error {
+	array := reflect.ValueOf(arg[0].Pointer())
+	array, err := indexable(array)
+	if err != nil {
+		return err
+	}
+
+	c.array = array
+	c.rowID = 0
+	return nil
+}
+
+func indexable(v reflect.Value) (_ reflect.Value, err error) {
+	if v.Kind() == reflect.Slice {
+		return v, nil
+	}
+	if v.Kind() == reflect.Array {
+		return v, nil
+	}
+	if v.Kind() == reflect.Pointer {
+		if v := v.Elem(); v.Kind() == reflect.Array {
+			return v, nil
+		}
+	}
+	return v, fmt.Errorf("array: unsupported argument:%.0w %v", sqlite3.MISMATCH, v.Type())
+}

ext/array/array_test.go

@@ -0,0 +1,92 @@
+package array_test
+
+import (
+	"fmt"
+	"log"
+	"math"
+	"reflect"
+	"testing"
+
+	"github.com/ncruces/go-sqlite3"
+	"github.com/ncruces/go-sqlite3/driver"
+	_ "github.com/ncruces/go-sqlite3/embed"
+	"github.com/ncruces/go-sqlite3/ext/array"
+)
+
+func Example() {
+	db, err := driver.Open(":memory:", func(c *sqlite3.Conn) error {
+		array.Register(c)
+		return nil
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer db.Close()
+
+	rows, err := db.Query(`
+		SELECT name
+		FROM pragma_function_list
+		WHERE name like 'geopoly%' AND narg IN array(?)`,
+		sqlite3.Pointer([]int{2, 3, 4}))
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var name string
+		err := rows.Scan(&name)
+		if err != nil {
+			log.Fatal(err)
+		}
+		fmt.Printf("%s\n", name)
+	}
+	if err := rows.Err(); err != nil {
+		log.Fatal(err)
+	}
+	// Unordered output:
+	// geopoly_regular
+	// geopoly_overlap
+	// geopoly_contains_point
+	// geopoly_within
+}
+
+func Test_cursor_Column(t *testing.T) {
+	db, err := driver.Open(":memory:", func(c *sqlite3.Conn) error {
+		array.Register(c)
+		return nil
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+
+	rows, err := db.Query(`
+		SELECT rowid, value FROM array(?)`,
+		sqlite3.Pointer(&[...]any{nil, true, 1, uint(2), math.Pi, "text", []byte{1, 2, 3}}))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer rows.Close()
+
+	want := []string{"nil", "int64", "int64", "int64", "float64", "string", "[]uint8"}
+
+	for rows.Next() {
+		var id, val any
+		err := rows.Scan(&id, &val)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if want := want[0]; val == nil {
+			if want != "nil" {
+				t.Errorf("got nil, want %s", want)
+			}
+		} else if got := reflect.TypeOf(val).String(); got != want {
+			t.Errorf("got %s, want %s", got, want)
+		}
+		want = want[1:]
+	}
+	if err := rows.Err(); err != nil {
+		log.Fatal(err)
+	}
+}

ext/blob/blob.go

@@ -0,0 +1,70 @@
+// Package blob provides an alternative interface to incremental BLOB I/O.
+package blob
+
+import (
+	"errors"
+
+	"github.com/ncruces/go-sqlite3"
+	"github.com/ncruces/go-sqlite3/internal/util"
+)
+
+// Register registers the blob_open SQL function:
+//
+//	blob_open(schema, table, column, rowid, flags, callback, args...)
+//
+// The callback must be an [sqlite3.Pointer] to an [OpenCallback].
+// Any optional args will be passed to the callback,
+// along with the [sqlite3.Blob] handle.
+//
+// https://sqlite.org/c3ref/blob.html
+func Register(db *sqlite3.Conn) {
+	db.CreateFunction("blob_open", -1,
+		sqlite3.DETERMINISTIC|sqlite3.DIRECTONLY, openBlob)
+}
+
+func openBlob(ctx sqlite3.Context, arg ...sqlite3.Value) {
+	if len(arg) < 6 {
+		ctx.ResultError(util.ErrorString("wrong number of arguments to function blob_open()"))
+		return
+	}
+
+	row := arg[3].Int64()
+
+	var err error
+	blob, ok := ctx.GetAuxData(0).(*sqlite3.Blob)
+	if ok {
+		err = blob.Reopen(row)
+		if errors.Is(err, sqlite3.MISUSE) {
+			// Blob was closed (db, table, column or write changed).
+			ok = false
+		}
+	}
+
+	if !ok {
+		db := arg[0].Text()
+		table := arg[1].Text()
+		column := arg[2].Text()
+		write := arg[4].Bool()
+		blob, err = ctx.Conn().OpenBlob(db, table, column, row, write)
+	}
+	if err != nil {
+		ctx.ResultError(err)
+		return
+	}
+
+	fn := arg[5].Pointer().(OpenCallback)
+	err = fn(blob, arg[6:]...)
+	if err != nil {
+		ctx.ResultError(err)
+		return
+	}
+
+	// This ensures the blob is closed if db, table, column or write change.
+	ctx.SetAuxData(0, blob)
+	ctx.SetAuxData(1, blob)
+	ctx.SetAuxData(2, blob)
+	ctx.SetAuxData(4, blob)
+}
+
+// OpenCallback is the type for the blob_open callback.
+type OpenCallback func(*sqlite3.Blob, ...sqlite3.Value) error

ext/blob/blob_test.go

@@ -0,0 +1,61 @@
+package blob_test
+
+import (
+	"io"
+	"log"
+	"os"
+
+	"github.com/ncruces/go-sqlite3"
+	"github.com/ncruces/go-sqlite3/driver"
+	_ "github.com/ncruces/go-sqlite3/embed"
+	"github.com/ncruces/go-sqlite3/ext/blob"
+	_ "github.com/ncruces/go-sqlite3/vfs/memdb"
+)
+
+func Example() {
+	// Open the database, registering the extension.
+	db, err := driver.Open("file:/test.db?vfs=memdb", func(conn *sqlite3.Conn) error {
+		blob.Register(conn)
+		return nil
+	})
+
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer db.Close()
+
+	_, err = db.Exec(`CREATE TABLE IF NOT EXISTS test (col)`)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	const message = "Hello BLOB!"
+
+	// Create the BLOB.
+	_, err = db.Exec(`INSERT INTO test VALUES (?)`, sqlite3.ZeroBlob(len(message)))
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// Write the BLOB.
+	_, err = db.Exec(`SELECT blob_open('main', 'test', 'col', last_insert_rowid(), true, ?)`,
+		sqlite3.Pointer[blob.OpenCallback](func(blob *sqlite3.Blob, _ ...sqlite3.Value) error {
+			_, err = io.WriteString(blob, message)
+			return err
+		}))
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// Read the BLOB.
+	_, err = db.Exec(`SELECT blob_open('main', 'test', 'col', rowid, false, ?) FROM test`,
+		sqlite3.Pointer[blob.OpenCallback](func(blob *sqlite3.Blob, _ ...sqlite3.Value) error {
+			_, err = io.Copy(os.Stdout, blob)
+			return err
+		}))
+	if err != nil {
+		log.Fatal(err)
+	}
+	// Output:
+	// Hello BLOB!
+}

ext/csv/csv.go

@@ -0,0 +1,198 @@
+// Package csv provides a CSV virtual table.
+//
+// The CSV virtual table reads RFC 4180 formatted comma-separated values,
+// and returns that content as if it were rows and columns of an SQL table.
+//
+// https://sqlite.org/csv.html
+package csv
+
+import (
+	"encoding/csv"
+	"fmt"
+	"io"
+	"math"
+	"os"
+	"strings"
+
+	"github.com/ncruces/go-sqlite3"
+)
+
+// Register registers the CSV virtual table.
+// If a filename is specified, `os.Open` is used to read it from disk.
+func Register(db *sqlite3.Conn) {
+	RegisterOpen(db, func(name string) (io.ReaderAt, error) {
+		return os.Open(name)
+	})
+}
+
+// RegisterOpen registers the CSV virtual table.
+// If a filename is specified, open is used to open the file.
+func RegisterOpen(db *sqlite3.Conn, open func(name string) (io.ReaderAt, error)) {
+	declare := func(db *sqlite3.Conn, arg ...string) (_ *table, err error) {
+		var (
+			filename string
+			data     string
+			schema   string
+			header   bool
+			columns  int  = -1
+			comma    rune = ','
+
+			done = map[string]struct{}{}
+		)
+
+		for _, arg := range arg[3:] {
+			key, val := getParam(arg)
+			if _, ok := done[key]; ok {
+				return nil, fmt.Errorf("csv: more than one %q parameter", key)
+			}
+			switch key {
+			case "filename":
+				filename = unquoteParam(val)
+			case "data":
+				data = unquoteParam(val)
+			case "schema":
+				schema = unquoteParam(val)
+			case "header":
+				header, err = boolParam(key, val)
+			case "columns":
+				columns, err = uintParam(key, val)
+			case "comma":
+				comma, err = runeParam(key, val)
+			default:
+				return nil, fmt.Errorf("csv: unknown %q parameter", key)
+			}
+			if err != nil {
+				return nil, err
+			}
+			done[key] = struct{}{}
+		}
+
+		if (filename == "") == (data == "") {
+			return nil, fmt.Errorf(`csv: must specify either "filename" or "data" but not both`)
+		}
+
+		var r io.ReaderAt
+		if filename != "" {
+			r, err = open(filename)
+		} else {
+			r = strings.NewReader(data)
+		}
+		if err != nil {
+			return nil, err
+		}
+
+		table := &table{
+			r:      r,
+			comma:  comma,
+			header: header,
+		}
+		defer func() {
+			if err != nil {
+				table.Close()
+			}
+		}()
+
+		if schema == "" && (header || columns < 0) {
+			csv := table.newReader()
+			row, err := csv.Read()
+			if err != nil {
+				return nil, err
+			}
+			schema = getSchema(header, columns, row)
+		}
+
+		err = db.DeclareVtab(schema)
+		if err != nil {
+			return nil, err
+		}
+		err = db.VtabConfig(sqlite3.VTAB_DIRECTONLY)
+		if err != nil {
+			return nil, err
+		}
+		return table, nil
+	}
+
+	sqlite3.CreateModule(db, "csv", declare, declare)
+}
+
+type table struct {
+	r      io.ReaderAt
+	comma  rune
+	header bool
+}
+
+func (t *table) Close() error {
+	if c, ok := t.r.(io.Closer); ok {
+		err := c.Close()
+		t.r = nil
+		return err
+	}
+	return nil
+}
+
+func (t *table) BestIndex(idx *sqlite3.IndexInfo) error {
+	idx.EstimatedCost = 1e6
+	return nil
+}
+
+func (t *table) Open() (sqlite3.VTabCursor, error) {
+	return &cursor{table: t}, nil
+}
+
+func (t *table) Rename(new string) error {
+	return nil
+}
+
+func (t *table) Integrity(schema, table string, flags int) (err error) {
+	if flags&1 == 0 {
+		_, err = t.newReader().ReadAll()
+	}
+	return err
+}
+
+func (t *table) newReader() *csv.Reader {
+	csv := csv.NewReader(io.NewSectionReader(t.r, 0, math.MaxInt64))
+	csv.ReuseRecord = true
+	csv.Comma = t.comma
+	return csv
+}
+
+type cursor struct {
+	table *table
+	rowID int64
+	row   []string
+	csv   *csv.Reader
+}
+
+func (c *cursor) Filter(idxNum int, idxStr string, arg ...sqlite3.Value) error {
+	c.csv = c.table.newReader()
+	if c.table.header {
+		c.Next() // skip header
+	}
+	c.rowID = 0
+	return c.Next()
+}
+
+func (c *cursor) Next() (err error) {
+	c.rowID++
+	c.row, err = c.csv.Read()
+	if err != io.EOF {
+		return err
+	}
+	return nil
+}
+
+func (c *cursor) EOF() bool {
+	return c.row == nil
+}
+
+func (c *cursor) RowID() (int64, error) {
+	return c.rowID, nil
+}
+
+func (c *cursor) Column(ctx *sqlite3.Context, col int) error {
+	if col < len(c.row) {
+		ctx.ResultText(c.row[col])
+	}
+	return nil
+}

ext/csv/csv_test.go

@@ -0,0 +1,151 @@
+package csv_test
+
+import (
+	"fmt"
+	"log"
+	"testing"
+
+	"github.com/ncruces/go-sqlite3"
+	_ "github.com/ncruces/go-sqlite3/embed"
+	"github.com/ncruces/go-sqlite3/ext/csv"
+)
+
+func Example() {
+	db, err := sqlite3.Open(":memory:")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer db.Close()
+
+	csv.Register(db)
+
+	err = db.Exec(`
+		CREATE VIRTUAL TABLE IF NOT EXISTS eurofxref USING csv(
+			filename = 'testdata/eurofxref.csv',
+			header   = YES,
+			columns  = 42,
+		)`)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	stmt, _, err := db.Prepare(`SELECT USD FROM eurofxref WHERE Date = '2022-02-22'`)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer stmt.Close()
+
+	if stmt.Step() {
+		fmt.Printf("On Twosday, 1€ = $%g", stmt.ColumnFloat(0))
+	}
+	if err := stmt.Reset(); err != nil {
+		log.Fatal(err)
+	}
+
+	err = db.Exec(`DROP TABLE eurofxref`)
+	if err != nil {
+		log.Fatal(err)
+	}
+	// Output:
+	// On Twosday, 1€ = $1.1342
+}
+
+func TestRegister(t *testing.T) {
+	db, err := sqlite3.Open(":memory:")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+
+	csv.Register(db)
+
+	const data = `
+"Rob"	"Pike"	rob
+"Ken"	Thompson	ken
+Robert	"Griesemer"	"gri"`
+	err = db.Exec(`
+		CREATE VIRTUAL TABLE temp.users USING csv(
+			data   = ` + sqlite3.Quote(data) + `,
+			schema = 'CREATE TABLE x(first_name, last_name, username)',
+			comma  = '\t'
+		)`)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	stmt, _, err := db.Prepare(`SELECT * FROM temp.users WHERE rowid = 1 ORDER BY username`)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer stmt.Close()
+
+	if !stmt.Step() {
+		t.Fatal("no rows")
+	}
+	if got := stmt.ColumnText(1); got != "Pike" {
+		t.Errorf("got %q want Pike", got)
+	}
+	if stmt.Step() {
+		t.Fatal("more rows")
+	}
+
+	err = db.Exec(`ALTER TABLE temp.users RENAME TO csv`)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = db.Exec(`PRAGMA integrity_check`)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = db.Exec(`DROP TABLE temp.csv`)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
+func TestRegister_errors(t *testing.T) {
+	db, err := sqlite3.Open(":memory:")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+
+	csv.Register(db)
+
+	err = db.Exec(`CREATE VIRTUAL TABLE temp.users USING csv()`)
+	if err == nil {
+		t.Fatal("want error")
+	} else {
+		t.Log(err)
+	}
+
+	err = db.Exec(`CREATE VIRTUAL TABLE temp.users USING csv(data='abc', data='abc')`)
+	if err == nil {
+		t.Fatal("want error")
+	} else {
+		t.Log(err)
+	}
+
+	err = db.Exec(`CREATE VIRTUAL TABLE temp.users USING csv(data='abc', xpto='abc')`)
+	if err == nil {
+		t.Fatal("want error")
+	} else {
+		t.Log(err)
+	}
+
+	err = db.Exec(`CREATE VIRTUAL TABLE temp.users USING csv(data='abc', comma='"')`)
+	if err == nil {
+		t.Fatal("want error")
+	} else {
+		t.Log(err)
+	}
+
+	err = db.Exec(`CREATE VIRTUAL TABLE temp.users USING csv(data='abc', header=tru)`)
+	if err == nil {
+		t.Fatal("want error")
+	} else {
+		t.Log(err)
+	}
+}

ext/csv/params.go

@@ -0,0 +1,65 @@
+package csv
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+func getParam(arg string) (key, val string) {
+	key, val, _ = strings.Cut(arg, "=")
+	key = strings.TrimSpace(key)
+	val = strings.TrimSpace(val)
+	return
+}
+
+func uintParam(key, val string) (int, error) {
+	i, err := strconv.ParseUint(val, 10, 15)
+	if err != nil {
+		return 0, fmt.Errorf("csv: invalid %q parameter: %s", key, val)
+	}
+	return int(i), nil
+}
+
+func boolParam(key, val string) (bool, error) {
+	if val == "" || val == "1" ||
+		strings.EqualFold(val, "true") ||
+		strings.EqualFold(val, "yes") ||
+		strings.EqualFold(val, "on") {
+		return true, nil
+	}
+	if val == "0" ||
+		strings.EqualFold(val, "false") ||
+		strings.EqualFold(val, "no") ||
+		strings.EqualFold(val, "off") {
+		return false, nil
+	}
+	return false, fmt.Errorf("csv: invalid %q parameter: %s", key, val)
+}
+
+func runeParam(key, val string) (rune, error) {
+	r, _, tail, err := strconv.UnquoteChar(unquoteParam(val), 0)
+	if tail != "" || err != nil {
+		return 0, fmt.Errorf("csv: invalid %q parameter: %s", key, val)
+	}
+	return r, nil
+}
+
+func unquoteParam(val string) string {
+	if len(val) < 2 {
+		return val
+	}
+	if val[0] != val[len(val)-1] {
+		return val
+	}
+	var old, new string
+	switch val[0] {
+	default:
+		return val
+	case '"':
+		old, new = `""`, `"`
+	case '\'':
+		old, new = `''`, `'`
+	}
+	return strings.ReplaceAll(val[1:len(val)-1], old, new)
+}

ext/csv/params_test.go

@@ -0,0 +1,102 @@
+package csv
+
+import "testing"
+
+func Test_uintParam(t *testing.T) {
+	tests := []struct {
+		arg string
+		key string
+		val int
+		err bool
+	}{
+		{"columns 1", "columns 1", 0, true},
+		{"columns  = 1", "columns", 1, false},
+		{"columns\t= 2", "columns", 2, false},
+		{" columns = 3", "columns", 3, false},
+		{" columns = -1", "columns", 0, true},
+		{" columns = 32768", "columns", 0, true},
+	}
+	for _, tt := range tests {
+		t.Run(tt.arg, func(t *testing.T) {
+			key, val := getParam(tt.arg)
+			if key != tt.key {
+				t.Errorf("getParam() %v, want err %v", key, tt.key)
+			}
+			got, err := uintParam(key, val)
+			if (err != nil) != tt.err {
+				t.Fatalf("uintParam() error = %v, want err %v", err, tt.err)
+			}
+			if got != tt.val {
+				t.Errorf("uintParam() = %v, want %v", got, tt.val)
+			}
+		})
+	}
+}
+
+func Test_boolParam(t *testing.T) {
+	tests := []struct {
+		arg string
+		key string
+		val bool
+		err bool
+	}{
+		{"header", "header", true, false},
+		{"header\t= 1", "header", true, false},
+		{" header = 0", "header", false, false},
+		{" header = TrUe", "header", true, false},
+		{" header = FaLsE", "header", false, false},
+		{" header = Yes", "header", true, false},
+		{" header = nO", "header", false, false},
+		{" header = On", "header", true, false},
+		{" header = Off", "header", false, false},
+		{" header = T", "header", false, true},
+		{" header = f", "header", false, true},
+	}
+	for _, tt := range tests {
+		t.Run(tt.arg, func(t *testing.T) {
+			key, val := getParam(tt.arg)
+			if key != tt.key {
+				t.Errorf("getParam() %v, want err %v", key, tt.key)
+			}
+			got, err := boolParam(key, val)
+			if (err != nil) != tt.err {
+				t.Fatalf("boolParam() error = %v, want err %v", err, tt.err)
+			}
+			if got != tt.val {
+				t.Errorf("boolParam() = %v, want %v", got, tt.val)
+			}
+		})
+	}
+}
+
+func Test_runeParam(t *testing.T) {
+	tests := []struct {
+		arg string
+		key string
+		val rune
+		err bool
+	}{
+		{"comma", "comma", 0, true},
+		{"comma\t= ,", "comma", ',', false},
+		{" comma = ;", "comma", ';', false},
+		{" comma = ;;", "comma", 0, true},
+		{` comma = '\t`, "comma", 0, true},
+		{` comma = '\t'`, "comma", '\t', false},
+		{` comma = "\t"`, "comma", '\t', false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.arg, func(t *testing.T) {
+			key, val := getParam(tt.arg)
+			if key != tt.key {
+				t.Errorf("getParam() %v, want err %v", key, tt.key)
+			}
+			got, err := runeParam(key, val)
+			if (err != nil) != tt.err {
+				t.Fatalf("runeParam() error = %v, want err %v", err, tt.err)
+			}
+			if got != tt.val {
+				t.Errorf("runeParam() = %v, want %v", got, tt.val)
+			}
+		})
+	}
+}

ext/csv/schema.go

@@ -0,0 +1,37 @@
+package csv
+
+import (
+	"strconv"
+	"strings"
+
+	"github.com/ncruces/go-sqlite3"
+)
+
+func getSchema(header bool, columns int, row []string) string {
+	var sep = ""
+	var str strings.Builder
+	str.WriteString(`CREATE TABLE x(`)
+
+	if 0 <= columns && columns < len(row) {
+		row = row[:columns]
+	}
+	for i, f := range row {
+		str.WriteString(sep)
+		if header && f != "" {
+			str.WriteString(sqlite3.QuoteIdentifier(f))
+		} else {
+			str.WriteByte('c')
+			str.WriteString(strconv.Itoa(i + 1))
+		}
+		sep = ","
+	}
+	for i := len(row); i < columns; i++ {
+		str.WriteString(sep)
+		str.WriteByte('c')
+		str.WriteString(strconv.Itoa(i + 1))
+		sep = ","
+	}
+	str.WriteByte(')')
+
+	return str.String()
+}

ext/csv/schema_test.go

@@ -0,0 +1,24 @@
+package csv
+
+import "testing"
+
+func Test_getSchema(t *testing.T) {
+	tests := []struct {
+		header  bool
+		columns int
+		row     []string
+		want    string
+	}{
+		{true, 2, nil, `CREATE TABLE x(c1,c2)`},
+		{false, 2, nil, `CREATE TABLE x(c1,c2)`},
+		{true, 3, []string{"abc", ""}, `CREATE TABLE x("abc",c2,c3)`},
+		{true, 1, []string{"abc", "def"}, `CREATE TABLE x("abc")`},
+	}
+	for _, tt := range tests {
+		t.Run(tt.want, func(t *testing.T) {
+			if got := getSchema(tt.header, tt.columns, tt.row); got != tt.want {
+				t.Errorf("getSchema() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}

ext/csv/testdata/eurofxref.csv

@@ -0,0 +1,258 @@
+Date,USD,JPY,BGN,CYP,CZK,DKK,EEK,GBP,HUF,LTL,LVL,MTL,PLN,ROL,RON,SEK,SIT,SKK,CHF,ISK,NOK,HRK,RUB,TRL,TRY,AUD,BRL,CAD,CNY,HKD,IDR,ILS,INR,KRW,MXN,MYR,NZD,PHP,SGD,THB,ZAR,
+2022-12-30,1.0666,140.66,1.9558,N/A,24.116,7.4365,N/A,0.88693,400.87,N/A,N/A,N/A,4.6808,N/A,4.9495,11.1218,N/A,N/A,0.9847,151.5,10.5138,7.5365,N/A,N/A,19.9649,1.5693,5.6386,1.444,7.3582,8.3163,16519.82,3.7554,88.171,1344.09,20.856,4.6984,1.6798,59.32,1.43,36.835,18.0986,
+2022-12-29,1.0649,142.24,1.9558,N/A,24.191,7.4365,N/A,0.88549,399.6,N/A,N/A,N/A,4.6855,N/A,4.9493,11.158,N/A,N/A,0.984,152.5,10.55,7.5365,N/A,N/A,19.934,1.5859,5.5351,1.4475,7.4151,8.2994,16680.38,3.7575,88.2295,1350.18,20.651,4.7106,1.6887,59.367,1.436,36.877,18.1967,
+2022-12-28,1.064,142.21,1.9558,N/A,24.252,7.4365,N/A,0.88058,403.3,N/A,N/A,N/A,4.7008,N/A,4.946,11.1038,N/A,N/A,0.9863,151.9,10.4495,7.5365,N/A,N/A,19.9144,1.566,5.6109,1.4361,7.4224,8.2931,16765.93,3.7526,88.0943,1348.59,20.6856,4.7055,1.6772,59.613,1.4323,36.953,18.289,
+2022-12-27,1.0624,141.68,1.9558,N/A,24.26,7.4366,N/A,0.88333,401.65,N/A,N/A,N/A,4.6683,N/A,4.927,11.1285,N/A,N/A,0.9885,152.3,10.4895,7.5375,N/A,N/A,19.8799,1.577,5.6035,1.4384,7.3994,8.2874,16620.58,3.7278,88.0808,1349.85,20.5515,4.699,1.6916,59.356,1.43,36.775,18.3181,
+2022-12-23,1.0622,140.86,1.9558,N/A,24.247,7.4364,N/A,0.8803,400.68,N/A,N/A,N/A,4.6423,N/A,4.9056,11.1045,N/A,N/A,0.9867,152.3,10.4448,7.537,N/A,N/A,19.843,1.5857,5.4834,1.4433,7.4198,8.2878,16569.18,3.704,87.958,1359.5,20.7115,4.7002,1.6887,58.623,1.4337,36.842,18.1048,
+2022-12-22,1.0633,140.42,1.9558,N/A,24.215,7.4367,N/A,0.88243,402.13,N/A,N/A,N/A,4.6443,N/A,4.8993,11.05,N/A,N/A,0.9852,153.3,10.4123,7.538,N/A,N/A,19.8553,1.5804,5.5386,1.4484,7.4229,8.2883,16525.91,3.6942,88.0365,1361.75,20.8485,4.7051,1.6918,58.705,1.4356,36.849,18.2238,
+2022-12-21,1.0636,140.29,1.9558,N/A,24.218,7.438,N/A,0.87651,402.93,N/A,N/A,N/A,4.6665,N/A,4.8937,11.0623,N/A,N/A,0.9836,152.1,10.4309,7.5419,N/A,N/A,19.8541,1.5859,5.4913,1.4475,7.4219,8.2902,16573.77,3.6989,88.109,1367.63,20.9919,4.7197,1.685,58.556,1.4366,36.907,18.3529,
+2022-12-20,1.0599,140.58,1.9558,N/A,24.181,7.4388,N/A,0.8753,403.88,N/A,N/A,N/A,4.6757,N/A,4.9125,11.0615,N/A,N/A,0.9854,151.5,10.5098,7.5471,N/A,N/A,19.7744,1.5972,5.6234,1.4451,7.39,8.2488,16537.09,3.6759,87.6649,1363.73,20.9355,4.6991,1.6816,58.549,1.4347,36.853,18.4239,
+2022-12-19,1.0598,144.65,1.9558,N/A,24.233,7.4382,N/A,0.87118,403.18,N/A,N/A,N/A,4.6853,N/A,4.9107,11.0063,N/A,N/A,0.9884,151.9,10.5025,7.5395,N/A,N/A,19.7676,1.5794,5.6327,1.4472,7.3901,8.2428,16506.72,3.6551,87.5321,1377.17,20.9743,4.6912,1.6632,58.649,1.4378,36.923,18.3074,
+2022-12-16,1.0619,145.53,1.9558,N/A,24.262,7.4379,N/A,0.87233,407.1,N/A,N/A,N/A,4.6925,N/A,4.9213,11.0153,N/A,N/A,0.9879,150.1,10.4833,7.5385,N/A,N/A,19.8039,1.5866,5.6233,1.4506,7.4037,8.2632,16575.47,3.6689,87.824,1389.7,21.0634,4.6984,1.6687,58.967,1.4413,37.145,18.6708,
+2022-12-15,1.0621,145.07,1.9558,N/A,24.27,7.4387,N/A,0.86194,406.4,N/A,N/A,N/A,4.689,N/A,4.922,10.898,N/A,N/A,0.9862,150.9,10.4013,7.5395,N/A,N/A,19.806,1.5695,5.6247,1.4443,7.4007,8.2551,16591.4,3.6388,87.9355,1393.97,20.9431,4.6918,1.6628,59.297,1.4406,37.12,18.3599,
+2022-12-14,1.0649,143.68,1.9558,N/A,24.276,7.4392,N/A,0.86118,406.63,N/A,N/A,N/A,4.681,N/A,4.9248,10.8638,N/A,N/A,0.9865,150.9,10.362,7.538,N/A,N/A,19.8579,1.551,5.6842,1.4441,7.4009,8.2751,16599.51,3.6327,87.8435,1379.99,20.8635,4.6765,1.6508,59.326,1.4349,36.851,18.2563,
+2022-12-13,1.0545,144.85,1.9558,N/A,24.287,7.4391,N/A,0.85753,409.65,N/A,N/A,N/A,4.6938,N/A,4.9298,10.8965,N/A,N/A,0.9869,151.1,10.4679,7.5495,N/A,N/A,19.6649,1.5553,5.5784,1.4341,7.3637,8.2033,16521.81,3.6266,87.2965,1378.75,20.9435,4.6704,1.6464,58.852,1.4288,36.707,18.6855,
+2022-12-12,1.0562,144.86,1.9558,N/A,24.307,7.4379,N/A,0.86006,416.78,N/A,N/A,N/A,4.6923,N/A,4.9318,10.9075,N/A,N/A,0.9855,150.7,10.5548,7.554,N/A,N/A,19.6913,1.5625,5.556,1.4428,7.367,8.2103,16524.63,3.6232,87.253,1377.93,20.9047,4.6652,1.6523,58.788,1.4284,36.708,18.4697,
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+2022-01-11,1.1336,130.95,1.9558,N/A,24.412,7.4404,N/A,0.83475,357.45,N/A,N/A,N/A,4.5438,N/A,4.945,10.3075,N/A,N/A,1.0502,147,10.0165,7.5236,84.8663,N/A,15.696,1.5804,6.389,1.4329,7.2255,8.8384,16221.39,3.549,83.7481,1352.85,23.0888,4.7515,1.6772,57.979,1.5342,37.862,17.7094,
+2022-01-10,1.1318,130.45,1.9558,N/A,24.357,7.4381,N/A,0.83398,358.4,N/A,N/A,N/A,4.5334,N/A,4.9449,10.3038,N/A,N/A,1.0446,146.2,10.0253,7.5278,84.9825,N/A,15.7183,1.5774,6.3969,1.4327,7.2128,8.8233,16181.9,3.5303,83.8,1355.68,23.0597,4.7536,1.6753,58.141,1.5344,38.074,17.6999,
+2022-01-07,1.1298,130.9,1.9558,N/A,24.439,7.438,N/A,0.8343,358.68,N/A,N/A,N/A,4.5496,N/A,4.9451,10.2839,N/A,N/A,1.0422,146,10.0288,7.5214,85.298,N/A,15.7206,1.5804,6.4343,1.4374,7.206,8.8133,16188.43,3.5135,83.978,1359.96,23.1109,4.7553,1.6748,58.046,1.5356,38.074,17.6701,
+2022-01-06,1.1315,131.05,1.9558,N/A,24.528,7.4393,N/A,0.83593,359.84,N/A,N/A,N/A,4.5614,N/A,4.9435,10.3265,N/A,N/A,1.0395,146.8,10.035,7.5197,86.5088,N/A,15.5504,1.5778,6.442,1.4451,7.2187,8.8272,16291.88,3.5247,84.2475,1362.06,23.2549,4.767,1.6752,57.943,1.5388,37.962,17.7932,
+2022-01-05,1.1319,131.03,1.9558,N/A,24.581,7.4384,N/A,0.83546,362.15,N/A,N/A,N/A,4.5666,N/A,4.946,10.2545,N/A,N/A,1.0364,146.8,9.9672,7.519,85.7275,N/A,15.2446,1.56,6.4146,1.4399,7.2087,8.8227,16263.02,3.4989,84.161,1354.61,23.1422,4.7466,1.6597,57.713,1.534,37.607,17.9369,
+2022-01-04,1.1279,131.17,1.9558,N/A,24.745,7.4378,N/A,0.83618,365.12,N/A,N/A,N/A,4.5667,N/A,4.9481,10.2808,N/A,N/A,1.0355,147.8,10.0138,7.5185,84.9202,N/A,15.1384,1.5682,6.4174,1.4382,7.1924,8.7919,16199.73,3.4909,84.2055,1352.91,23.1808,4.7214,1.6668,57.988,1.531,37.582,18.108,
+2022-01-03,1.1355,130.56,1.9558,N/A,24.818,7.4382,N/A,0.84135,367.71,N/A,N/A,N/A,4.5895,N/A,4.9483,10.2958,N/A,N/A,1.0372,147.6,10.0013,7.519,84.5313,N/A,15.0777,1.5691,6.3539,1.442,7.2174,8.8541,16202.02,3.5139,84.3949,1354.4,23.2259,4.7379,1.6651,58.051,1.5333,37.665,17.9661,

ext/lines/lines.go

@@ -0,0 +1,121 @@
+// Package lines provides a virtual table to read large files line-by-line.
+package lines
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"io"
+	"math"
+	"os"
+
+	"github.com/ncruces/go-sqlite3"
+)
+
+// Register registers the lines and lines_read virtual tables.
+// The lines virtual table reads from a database blob or text.
+// The lines_read virtual table reads from a file or an [io.ReaderAt].
+func Register(db *sqlite3.Conn) {
+	sqlite3.CreateModule[lines](db, "lines", nil,
+		func(db *sqlite3.Conn, arg ...string) (lines, error) {
+			err := db.DeclareVtab(`CREATE TABLE x(line TEXT, data HIDDEN)`)
+			db.VtabConfig(sqlite3.VTAB_INNOCUOUS)
+			return false, err
+		})
+	sqlite3.CreateModule[lines](db, "lines_read", nil,
+		func(db *sqlite3.Conn, arg ...string) (lines, error) {
+			err := db.DeclareVtab(`CREATE TABLE x(line TEXT, data HIDDEN)`)
+			db.VtabConfig(sqlite3.VTAB_DIRECTONLY)
+			return true, err
+		})
+}
+
+type lines bool
+
+func (l lines) BestIndex(idx *sqlite3.IndexInfo) error {
+	for i, cst := range idx.Constraint {
+		if cst.Column == 1 && cst.Op == sqlite3.INDEX_CONSTRAINT_EQ && cst.Usable {
+			idx.ConstraintUsage[i] = sqlite3.IndexConstraintUsage{
+				Omit:      true,
+				ArgvIndex: 1,
+			}
+			idx.EstimatedCost = 1e6
+			idx.EstimatedRows = 100
+			return nil
+		}
+	}
+	return sqlite3.CONSTRAINT
+}
+
+func (l lines) Open() (sqlite3.VTabCursor, error) {
+	return &cursor{reader: bool(l)}, nil
+}
+
+type cursor struct {
+	reader  bool
+	scanner *bufio.Scanner
+	closer  io.Closer
+	rowID   int64
+	eof     bool
+}
+
+func (c *cursor) Close() (err error) {
+	if c.closer != nil {
+		err = c.closer.Close()
+		c.closer = nil
+	}
+	return err
+}
+
+func (c *cursor) EOF() bool {
+	return c.eof
+}
+
+func (c *cursor) Next() error {
+	c.rowID++
+	c.eof = !c.scanner.Scan()
+	return c.scanner.Err()
+}
+
+func (c *cursor) RowID() (int64, error) {
+	return c.rowID, nil
+}
+
+func (c *cursor) Column(ctx *sqlite3.Context, n int) error {
+	if n == 0 {
+		ctx.ResultRawText(c.scanner.Bytes())
+	}
+	return nil
+}
+
+func (c *cursor) Filter(idxNum int, idxStr string, arg ...sqlite3.Value) error {
+	if err := c.Close(); err != nil {
+		return err
+	}
+
+	var r io.Reader
+	data := arg[0]
+	if c.reader {
+		if data.Type() == sqlite3.NULL {
+			if p, ok := data.Pointer().(io.ReaderAt); ok {
+				r = io.NewSectionReader(p, 0, math.MaxInt64)
+			}
+		} else {
+			f, err := os.Open(data.Text())
+			if err != nil {
+				return err
+			}
+			c.closer = f
+			r = f
+		}
+	} else if data.Type() != sqlite3.NULL {
+		r = bytes.NewReader(data.RawBlob())
+	}
+
+	if r == nil {
+		return fmt.Errorf("lines: unsupported argument:%.0w %v", sqlite3.MISMATCH, data.Type())
+	}
+	c.scanner = bufio.NewScanner(r)
+	c.rowID = 0
+	return c.Next()
+}

ext/lines/lines_test.go

@@ -0,0 +1,178 @@
+package lines_test
+
+import (
+	"database/sql"
+	"errors"
+	"fmt"
+	"log"
+	"os"
+	"strings"
+	"testing"
+
+	"github.com/ncruces/go-sqlite3"
+	"github.com/ncruces/go-sqlite3/driver"
+	_ "github.com/ncruces/go-sqlite3/embed"
+	"github.com/ncruces/go-sqlite3/ext/lines"
+)
+
+func Example() {
+	db, err := driver.Open(":memory:", func(c *sqlite3.Conn) error {
+		lines.Register(c)
+		return nil
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer db.Close()
+
+	// https://storage.googleapis.com/quickdraw_dataset/full/simplified/calendar.ndjson
+	f, err := os.Open("calendar.ndjson")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer f.Close()
+
+	rows, err := db.Query(`
+		SELECT
+			line ->> '$.countrycode' as countrycode,
+			COUNT(*)
+  		FROM lines_read(?)
+  		GROUP BY 1
+  		ORDER BY 2 DESC
+  		LIMIT 5`,
+		sqlite3.Pointer(f))
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer rows.Close()
+
+	var countrycode sql.RawBytes
+	var count int
+	for rows.Next() {
+		err := rows.Scan(&countrycode, &count)
+		if err != nil {
+			log.Fatal(err)
+		}
+		fmt.Printf("%s: %d\n", countrycode, count)
+	}
+	if err := rows.Err(); err != nil {
+		log.Fatal(err)
+	}
+	// Sample output:
+	// US: 141001
+	// GB: 22560
+	// CA: 11759
+	// RU: 9250
+	// DE: 8748
+}
+
+func Test_lines(t *testing.T) {
+	db, err := driver.Open(":memory:", func(c *sqlite3.Conn) error {
+		lines.Register(c)
+		return nil
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer db.Close()
+
+	const data = "line 1\nline 2\nline 3"
+
+	rows, err := db.Query(`SELECT rowid, line FROM lines(?)`, data)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var id int64
+		var line string
+		err := rows.Scan(&id, &line)
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+}
+
+func Test_lines_error(t *testing.T) {
+	db, err := driver.Open(":memory:", func(c *sqlite3.Conn) error {
+		lines.Register(c)
+		return nil
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer db.Close()
+
+	_, err = db.Exec(`SELECT rowid, line FROM lines(?)`, nil)
+	if err == nil {
+		t.Fatal("want error")
+	} else {
+		t.Log(err)
+	}
+
+	_, err = db.Exec(`SELECT rowid, line FROM lines_read(?)`, "xpto")
+	if err == nil {
+		t.Fatal("want error")
+	} else {
+		t.Log(err)
+	}
+}
+
+func Test_lines_read(t *testing.T) {
+	db, err := driver.Open(":memory:", func(c *sqlite3.Conn) error {
+		lines.Register(c)
+		return nil
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer db.Close()
+
+	const data = "line 1\nline 2\nline 3"
+
+	rows, err := db.Query(`SELECT rowid, line FROM lines_read(?)`,
+		sqlite3.Pointer(strings.NewReader(data)))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var id int64
+		var line string
+		err := rows.Scan(&id, &line)
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+}
+
+func Test_lines_test(t *testing.T) {
+	db, err := driver.Open(":memory:", func(c *sqlite3.Conn) error {
+		lines.Register(c)
+		return nil
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer db.Close()
+
+	rows, err := db.Query(`SELECT rowid, line FROM lines_read(?)`, "lines_test.go")
+	if errors.Is(err, os.ErrNotExist) {
+		t.Skip(err)
+	}
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var id int64
+		var line string
+		err := rows.Scan(&id, &line)
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+}

ext/stats/stats.go

@@ -0,0 +1,109 @@
+// Package stats provides aggregate functions for statistics.
+//
+// Functions:
+//   - stddev_pop: population standard deviation
+//   - stddev_samp: sample standard deviation
+//   - var_pop: population variance
+//   - var_samp: sample variance
+//   - covar_pop: population covariance
+//   - covar_samp: sample covariance
+//   - corr: correlation coefficient
+//
+// See: [ANSI SQL Aggregate Functions]
+//
+// [ANSI SQL Aggregate Functions]: https://www.oreilly.com/library/view/sql-in-a/9780596155322/ch04s02.html
+package stats
+
+import "github.com/ncruces/go-sqlite3"
+
+// Register registers statistics functions.
+func Register(db *sqlite3.Conn) {
+	flags := sqlite3.DETERMINISTIC | sqlite3.INNOCUOUS
+	db.CreateWindowFunction("var_pop", 1, flags, newVariance(var_pop))
+	db.CreateWindowFunction("var_samp", 1, flags, newVariance(var_samp))
+	db.CreateWindowFunction("stddev_pop", 1, flags, newVariance(stddev_pop))
+	db.CreateWindowFunction("stddev_samp", 1, flags, newVariance(stddev_samp))
+	db.CreateWindowFunction("covar_pop", 2, flags, newCovariance(var_pop))
+	db.CreateWindowFunction("covar_samp", 2, flags, newCovariance(var_samp))
+	db.CreateWindowFunction("corr", 2, flags, newCovariance(corr))
+}
+
+const (
+	var_pop = iota
+	var_samp
+	stddev_pop
+	stddev_samp
+	corr
+)
+
+func newVariance(kind int) func() sqlite3.AggregateFunction {
+	return func() sqlite3.AggregateFunction { return &variance{kind: kind} }
+}
+
+type variance struct {
+	kind int
+	welford
+}
+
+func (fn *variance) Value(ctx sqlite3.Context) {
+	var r float64
+	switch fn.kind {
+	case var_pop:
+		r = fn.var_pop()
+	case var_samp:
+		r = fn.var_samp()
+	case stddev_pop:
+		r = fn.stddev_pop()
+	case stddev_samp:
+		r = fn.stddev_samp()
+	}
+	ctx.ResultFloat(r)
+}
+
+func (fn *variance) Step(ctx sqlite3.Context, arg ...sqlite3.Value) {
+	if a := arg[0]; a.Type() != sqlite3.NULL {
+		fn.enqueue(a.Float())
+	}
+}
+
+func (fn *variance) Inverse(ctx sqlite3.Context, arg ...sqlite3.Value) {
+	if a := arg[0]; a.Type() != sqlite3.NULL {
+		fn.dequeue(a.Float())
+	}
+}
+
+func newCovariance(kind int) func() sqlite3.AggregateFunction {
+	return func() sqlite3.AggregateFunction { return &covariance{kind: kind} }
+}
+
+type covariance struct {
+	kind int
+	welford2
+}
+
+func (fn *covariance) Value(ctx sqlite3.Context) {
+	var r float64
+	switch fn.kind {
+	case var_pop:
+		r = fn.covar_pop()
+	case var_samp:
+		r = fn.covar_samp()
+	case corr:
+		r = fn.correlation()
+	}
+	ctx.ResultFloat(r)
+}
+
+func (fn *covariance) Step(ctx sqlite3.Context, arg ...sqlite3.Value) {
+	a, b := arg[0], arg[1]
+	if a.Type() != sqlite3.NULL && b.Type() != sqlite3.NULL {
+		fn.enqueue(a.Float(), b.Float())
+	}
+}
+
+func (fn *covariance) Inverse(ctx sqlite3.Context, arg ...sqlite3.Value) {
+	a, b := arg[0], arg[1]
+	if a.Type() != sqlite3.NULL && b.Type() != sqlite3.NULL {
+		fn.dequeue(a.Float(), b.Float())
+	}
+}

ext/stats/stats_test.go

@@ -0,0 +1,140 @@
+package stats
+
+import (
+	"math"
+	"testing"
+
+	"github.com/ncruces/go-sqlite3"
+	_ "github.com/ncruces/go-sqlite3/embed"
+)
+
+func TestRegister_variance(t *testing.T) {
+	t.Parallel()
+
+	db, err := sqlite3.Open(":memory:")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+
+	Register(db)
+
+	err = db.Exec(`CREATE TABLE IF NOT EXISTS data (x)`)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = db.Exec(`INSERT INTO data (x) VALUES (4), (7.0), ('13'), (NULL), (16)`)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	stmt, _, err := db.Prepare(`
+		SELECT
+			sum(x), avg(x),
+			var_samp(x), var_pop(x),
+			stddev_samp(x), stddev_pop(x)
+		FROM data`)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer stmt.Close()
+
+	if stmt.Step() {
+		if got := stmt.ColumnFloat(0); got != 40 {
+			t.Errorf("got %v, want 40", got)
+		}
+		if got := stmt.ColumnFloat(1); got != 10 {
+			t.Errorf("got %v, want 10", got)
+		}
+		if got := stmt.ColumnFloat(2); got != 30 {
+			t.Errorf("got %v, want 30", got)
+		}
+		if got := stmt.ColumnFloat(3); got != 22.5 {
+			t.Errorf("got %v, want 22.5", got)
+		}
+		if got := stmt.ColumnFloat(4); got != math.Sqrt(30) {
+			t.Errorf("got %v, want √30", got)
+		}
+		if got := stmt.ColumnFloat(5); got != math.Sqrt(22.5) {
+			t.Errorf("got %v, want √22.5", got)
+		}
+	}
+
+	{
+		stmt, _, err := db.Prepare(`SELECT var_samp(x) OVER (ROWS 1 PRECEDING) FROM data`)
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer stmt.Close()
+
+		want := [...]float64{0, 4.5, 18, 0, 0}
+		for i := 0; stmt.Step(); i++ {
+			if got := stmt.ColumnFloat(0); got != want[i] {
+				t.Errorf("got %v, want %v", got, want[i])
+			}
+			if got := stmt.ColumnType(0); (got == sqlite3.FLOAT) != (want[i] != 0) {
+				t.Errorf("got %v, want %v", got, want[i])
+			}
+		}
+	}
+}
+
+func TestRegister_covariance(t *testing.T) {
+	t.Parallel()
+
+	db, err := sqlite3.Open(":memory:")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+
+	Register(db)
+
+	err = db.Exec(`CREATE TABLE IF NOT EXISTS data (x, y)`)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = db.Exec(`INSERT INTO data (x, y) VALUES (3, 70), (5, 80), (2, 60), (7, 90), (4, 75)`)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	stmt, _, err := db.Prepare(`SELECT
+		corr(x, y), covar_samp(x, y), covar_pop(x, y) FROM data`)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer stmt.Close()
+
+	if stmt.Step() {
+		if got := stmt.ColumnFloat(0); got != 0.9881049293224639 {
+			t.Errorf("got %v, want 0.9881049293224639", got)
+		}
+		if got := stmt.ColumnFloat(1); got != 21.25 {
+			t.Errorf("got %v, want 21.25", got)
+		}
+		if got := stmt.ColumnFloat(2); got != 17 {
+			t.Errorf("got %v, want 17", got)
+		}
+	}
+
+	{
+		stmt, _, err := db.Prepare(`SELECT covar_samp(x, y) OVER (ROWS 1 PRECEDING) FROM data`)
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer stmt.Close()
+
+		want := [...]float64{0, 10, 30, 75, 22.5}
+		for i := 0; stmt.Step(); i++ {
+			if got := stmt.ColumnFloat(0); got != want[i] {
+				t.Errorf("got %v, want %v", got, want[i])
+			}
+			if got := stmt.ColumnType(0); (got == sqlite3.FLOAT) != (want[i] != 0) {
+				t.Errorf("got %v, want %v", got, want[i])
+			}
+		}
+	}
+}

ext/stats/welford.go

@@ -0,0 +1,109 @@
+package stats
+
+import "math"
+
+// Welford's algorithm with Kahan summation:
+// https://en.wikipedia.org/wiki/Algorithms_for_calculating_variance#Welford's_online_algorithm
+// https://en.wikipedia.org/wiki/Kahan_summation_algorithm
+
+type welford struct {
+	m1, m2 kahan
+	n      uint64
+}
+
+func (w welford) average() float64 {
+	return w.m1.hi
+}
+
+func (w welford) var_pop() float64 {
+	return w.m2.hi / float64(w.n)
+}
+
+func (w welford) var_samp() float64 {
+	return w.m2.hi / float64(w.n-1) // Bessel's correction
+}
+
+func (w welford) stddev_pop() float64 {
+	return math.Sqrt(w.var_pop())
+}
+
+func (w welford) stddev_samp() float64 {
+	return math.Sqrt(w.var_samp())
+}
+
+func (w *welford) enqueue(x float64) {
+	w.n++
+	d1 := x - w.m1.hi - w.m1.lo
+	w.m1.add(d1 / float64(w.n))
+	d2 := x - w.m1.hi - w.m1.lo
+	w.m2.add(d1 * d2)
+}
+
+func (w *welford) dequeue(x float64) {
+	w.n--
+	d1 := x - w.m1.hi - w.m1.lo
+	w.m1.sub(d1 / float64(w.n))
+	d2 := x - w.m1.hi - w.m1.lo
+	w.m2.sub(d1 * d2)
+}
+
+type welford2 struct {
+	m1x, m2x kahan
+	m1y, m2y kahan
+	cov      kahan
+	n        uint64
+}
+
+func (w welford2) covar_pop() float64 {
+	return w.cov.hi / float64(w.n)
+}
+
+func (w welford2) covar_samp() float64 {
+	return w.cov.hi / float64(w.n-1) // Bessel's correction
+}
+
+func (w welford2) correlation() float64 {
+	return w.cov.hi / math.Sqrt(w.m2x.hi*w.m2y.hi)
+}
+
+func (w *welford2) enqueue(x, y float64) {
+	w.n++
+	d1x := x - w.m1x.hi - w.m1x.lo
+	d1y := y - w.m1y.hi - w.m1y.lo
+	w.m1x.add(d1x / float64(w.n))
+	w.m1y.add(d1y / float64(w.n))
+	d2x := x - w.m1x.hi - w.m1x.lo
+	d2y := y - w.m1y.hi - w.m1y.lo
+	w.m2x.add(d1x * d2x)
+	w.m2y.add(d1y * d2y)
+	w.cov.add(d1x * d2y)
+}
+
+func (w *welford2) dequeue(x, y float64) {
+	w.n--
+	d1x := x - w.m1x.hi - w.m1x.lo
+	d1y := y - w.m1y.hi - w.m1y.lo
+	w.m1x.sub(d1x / float64(w.n))
+	w.m1y.sub(d1y / float64(w.n))
+	d2x := x - w.m1x.hi - w.m1x.lo
+	d2y := y - w.m1y.hi - w.m1y.lo
+	w.m2x.sub(d1x * d2x)
+	w.m2y.sub(d1y * d2y)
+	w.cov.sub(d1x * d2y)
+}
+
+type kahan struct{ hi, lo float64 }
+
+func (k *kahan) add(x float64) {
+	y := k.lo + x
+	t := k.hi + y
+	k.lo = y - (t - k.hi)
+	k.hi = t
+}
+
+func (k *kahan) sub(x float64) {
+	y := k.lo - x
+	t := k.hi + y
+	k.lo = y - (t - k.hi)
+	k.hi = t
+}

ext/stats/welford_test.go

@@ -0,0 +1,75 @@
+package stats
+
+import (
+	"math"
+	"testing"
+)
+
+func Test_welford(t *testing.T) {
+	var s1, s2 welford
+
+	s1.enqueue(4)
+	s1.enqueue(7)
+	s1.enqueue(13)
+	s1.enqueue(16)
+	if got := s1.average(); got != 10 {
+		t.Errorf("got %v, want 10", got)
+	}
+	if got := s1.var_samp(); got != 30 {
+		t.Errorf("got %v, want 30", got)
+	}
+	if got := s1.var_pop(); got != 22.5 {
+		t.Errorf("got %v, want 22.5", got)
+	}
+	if got := s1.stddev_samp(); got != math.Sqrt(30) {
+		t.Errorf("got %v, want √30", got)
+	}
+	if got := s1.stddev_pop(); got != math.Sqrt(22.5) {
+		t.Errorf("got %v, want √22.5", got)
+	}
+
+	s1.dequeue(4)
+	s2.enqueue(7)
+	s2.enqueue(13)
+	s2.enqueue(16)
+	if s1.var_pop() != s2.var_pop() {
+		t.Errorf("got %v, want %v", s1, s2)
+	}
+}
+
+func Test_covar(t *testing.T) {
+	var c1, c2 welford2
+
+	c1.enqueue(3, 70)
+	c1.enqueue(5, 80)
+	c1.enqueue(2, 60)
+	c1.enqueue(7, 90)
+	c1.enqueue(4, 75)
+
+	if got := c1.covar_samp(); got != 21.25 {
+		t.Errorf("got %v, want 21.25", got)
+	}
+	if got := c1.covar_pop(); got != 17 {
+		t.Errorf("got %v, want 17", got)
+	}
+
+	c1.dequeue(3, 70)
+	c2.enqueue(5, 80)
+	c2.enqueue(2, 60)
+	c2.enqueue(7, 90)
+	c2.enqueue(4, 75)
+	if c1.covar_pop() != c2.covar_pop() {
+		t.Errorf("got %v, want %v", c1.covar_pop(), c2.covar_pop())
+	}
+}
+
+func Test_correlation(t *testing.T) {
+	var c welford2
+	c.enqueue(1, 3)
+	c.enqueue(2, 2)
+	c.enqueue(3, 1)
+
+	if got := c.correlation(); got != -1 {
+		t.Errorf("got %v, want -1", got)
+	}
+}

ext/unicode/unicode.go

@@ -0,0 +1,181 @@
+// Package unicode provides an alternative to the SQLite ICU extension.
+//
+// Like the [ICU extension], it provides Unicode aware:
+//   - upper() and lower() functions,
+//   - LIKE and REGEXP operators,
+//   - collation sequences.
+//
+// The implementation is not 100% compatible with the [ICU extension]:
+//   - upper() and lower() use [strings.ToUpper], [strings.ToLower] and [cases];
+//   - the LIKE operator follows [strings.EqualFold] rules;
+//   - the REGEXP operator uses Go [regex/syntax];
+//   - collation sequences use [collate].
+//
+// Expect subtle differences (e.g.) in the handling of Turkish case folding.
+//
+// [ICU extension]: https://sqlite.org/src/dir/ext/icu
+package unicode
+
+import (
+	"bytes"
+	"regexp"
+	"strings"
+	"unicode/utf8"
+
+	"github.com/ncruces/go-sqlite3"
+	"github.com/ncruces/go-sqlite3/internal/util"
+	"golang.org/x/text/cases"
+	"golang.org/x/text/collate"
+	"golang.org/x/text/language"
+)
+
+// Register registers Unicode aware functions for a database connection.
+func Register(db *sqlite3.Conn) {
+	flags := sqlite3.DETERMINISTIC | sqlite3.INNOCUOUS
+
+	db.CreateFunction("like", 2, flags, like)
+	db.CreateFunction("like", 3, flags, like)
+	db.CreateFunction("upper", 1, flags, upper)
+	db.CreateFunction("upper", 2, flags, upper)
+	db.CreateFunction("lower", 1, flags, lower)
+	db.CreateFunction("lower", 2, flags, lower)
+	db.CreateFunction("regexp", 2, flags, regex)
+	db.CreateFunction("icu_load_collation", 2, sqlite3.DIRECTONLY,
+		func(ctx sqlite3.Context, arg ...sqlite3.Value) {
+			name := arg[1].Text()
+			if name == "" {
+				return
+			}
+
+			err := RegisterCollation(db, arg[0].Text(), name)
+			if err != nil {
+				ctx.ResultError(err)
+				return
+			}
+		})
+}
+
+// RegisterCollation registers a Unicode collation sequence for a database connection.
+func RegisterCollation(db *sqlite3.Conn, locale, name string) error {
+	tag, err := language.Parse(locale)
+	if err != nil {
+		return err
+	}
+	return db.CreateCollation(name, collate.New(tag).Compare)
+}
+
+func upper(ctx sqlite3.Context, arg ...sqlite3.Value) {
+	if len(arg) == 1 {
+		ctx.ResultRawText(bytes.ToUpper(arg[0].RawText()))
+		return
+	}
+	cs, ok := ctx.GetAuxData(1).(cases.Caser)
+	if !ok {
+		t, err := language.Parse(arg[1].Text())
+		if err != nil {
+			ctx.ResultError(err)
+			return
+		}
+		c := cases.Upper(t)
+		ctx.SetAuxData(1, c)
+		cs = c
+	}
+	ctx.ResultRawText(cs.Bytes(arg[0].RawText()))
+}
+
+func lower(ctx sqlite3.Context, arg ...sqlite3.Value) {
+	if len(arg) == 1 {
+		ctx.ResultRawText(bytes.ToLower(arg[0].RawText()))
+		return
+	}
+	cs, ok := ctx.GetAuxData(1).(cases.Caser)
+	if !ok {
+		t, err := language.Parse(arg[1].Text())
+		if err != nil {
+			ctx.ResultError(err)
+			return
+		}
+		c := cases.Lower(t)
+		ctx.SetAuxData(1, c)
+		cs = c
+	}
+	ctx.ResultRawText(cs.Bytes(arg[0].RawText()))
+}
+
+func regex(ctx sqlite3.Context, arg ...sqlite3.Value) {
+	re, ok := ctx.GetAuxData(0).(*regexp.Regexp)
+	if !ok {
+		r, err := regexp.Compile(arg[0].Text())
+		if err != nil {
+			ctx.ResultError(err)
+			return
+		}
+		re = r
+		ctx.SetAuxData(0, re)
+	}
+	ctx.ResultBool(re.Match(arg[1].RawBlob()))
+}
+
+func like(ctx sqlite3.Context, arg ...sqlite3.Value) {
+	escape := rune(-1)
+	if len(arg) == 3 {
+		var size int
+		b := arg[2].RawBlob()
+		escape, size = utf8.DecodeRune(b)
+		if size != len(b) {
+			ctx.ResultError(util.ErrorString("ESCAPE expression must be a single character"))
+			return
+		}
+	}
+
+	type likeData struct {
+		*regexp.Regexp
+		escape rune
+	}
+
+	re, ok := ctx.GetAuxData(0).(likeData)
+	if !ok || re.escape != escape {
+		re = likeData{
+			regexp.MustCompile(like2regex(arg[0].Text(), escape)),
+			escape,
+		}
+		ctx.SetAuxData(0, re)
+	}
+	ctx.ResultBool(re.Match(arg[1].RawBlob()))
+}
+
+func like2regex(pattern string, escape rune) string {
+	var re strings.Builder
+	start := 0
+	literal := false
+	re.Grow(len(pattern) + 10)
+	re.WriteString(`(?is)\A`) // case insensitive, . matches any character
+	for i, r := range pattern {
+		if start < 0 {
+			start = i
+		}
+		if literal {
+			literal = false
+			continue
+		}
+		var symbol string
+		switch r {
+		case '_':
+			symbol = `.`
+		case '%':
+			symbol = `.*`
+		case escape:
+			literal = true
+		default:
+			continue
+		}
+		re.WriteString(regexp.QuoteMeta(pattern[start:i]))
+		re.WriteString(symbol)
+		start = -1
+	}
+	if start >= 0 {
+		re.WriteString(regexp.QuoteMeta(pattern[start:]))
+	}
+	re.WriteString(`\z`)
+	return re.String()
+}

ext/unicode/unicode_test.go

@@ -0,0 +1,215 @@
+package unicode
+
+import (
+	"errors"
+	"reflect"
+	"testing"
+
+	"github.com/ncruces/go-sqlite3"
+	_ "github.com/ncruces/go-sqlite3/embed"
+)
+
+func TestRegister(t *testing.T) {
+	t.Parallel()
+
+	db, err := sqlite3.Open(":memory:")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+
+	exec := func(fn string) string {
+		stmt, _, err := db.Prepare(`SELECT ` + fn)
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer stmt.Close()
+
+		if stmt.Step() {
+			return stmt.ColumnText(0)
+		}
+		t.Fatal(stmt.Err())
+		return ""
+	}
+
+	Register(db)
+
+	tests := []struct {
+		test string
+		want string
+	}{
+		{`upper('hello')`, "HELLO"},
+		{`lower('HELLO')`, "hello"},
+		{`upper('привет')`, "ПРИВЕТ"},
+		{`lower('ПРИВЕТ')`, "привет"},
+		{`upper('istanbul')`, "ISTANBUL"},
+		{`upper('istanbul', 'tr-TR')`, "İSTANBUL"},
+		{`lower('Dünyanın İlk Borsası', 'tr-TR')`, "dünyanın ilk borsası"},
+		{`upper('Dünyanın İlk Borsası', 'tr-TR')`, "DÜNYANIN İLK BORSASI"},
+		{`'Hello' REGEXP 'ell'`, "1"},
+		{`'Hello' REGEXP 'el.'`, "1"},
+		{`'Hello' LIKE 'hel_'`, "0"},
+		{`'Hello' LIKE 'hel%'`, "1"},
+		{`'Hello' LIKE 'h_llo'`, "1"},
+		{`'Hello' LIKE 'hello'`, "1"},
+		{`'Привет' LIKE 'ПРИВЕТ'`, "1"},
+		{`'100%' LIKE '100|%' ESCAPE '|'`, "1"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.test, func(t *testing.T) {
+			if got := exec(tt.test); got != tt.want {
+				t.Errorf("exec(%q) = %q, want %q", tt.test, got, tt.want)
+			}
+		})
+	}
+
+	err = db.Close()
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestRegister_collation(t *testing.T) {
+	t.Parallel()
+
+	db, err := sqlite3.Open(":memory:")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+
+	Register(db)
+
+	err = db.Exec(`CREATE TABLE IF NOT EXISTS words (word VARCHAR(10))`)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = db.Exec(`INSERT INTO words (word) VALUES ('côte'), ('cote'), ('coter'), ('coté'), ('cotée'), ('côté')`)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = db.Exec(`SELECT icu_load_collation('fr_FR', 'french')`)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	stmt, _, err := db.Prepare(`SELECT word FROM words ORDER BY word COLLATE french`)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer stmt.Close()
+
+	got, want := []string{}, []string{"cote", "coté", "côte", "côté", "cotée", "coter"}
+
+	for stmt.Step() {
+		got = append(got, stmt.ColumnText(0))
+	}
+	if err := stmt.Err(); err != nil {
+		t.Fatal(err)
+	}
+
+	if !reflect.DeepEqual(got, want) {
+		t.Error("not equal")
+	}
+
+	err = stmt.Close()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = db.Close()
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestRegister_error(t *testing.T) {
+	t.Parallel()
+
+	db, err := sqlite3.Open(":memory:")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+
+	Register(db)
+
+	err = db.Exec(`SELECT upper('hello', 'enUS')`)
+	if err == nil {
+		t.Error("want error")
+	}
+	if !errors.Is(err, sqlite3.ERROR) {
+		t.Errorf("got %v, want sqlite3.ERROR", err)
+	}
+
+	err = db.Exec(`SELECT lower('hello', 'enUS')`)
+	if err == nil {
+		t.Error("want error")
+	}
+	if !errors.Is(err, sqlite3.ERROR) {
+		t.Errorf("got %v, want sqlite3.ERROR", err)
+	}
+
+	err = db.Exec(`SELECT 'hello' REGEXP '\'`)
+	if err == nil {
+		t.Error("want error")
+	}
+	if !errors.Is(err, sqlite3.ERROR) {
+		t.Errorf("got %v, want sqlite3.ERROR", err)
+	}
+
+	err = db.Exec(`SELECT 'hello' LIKE 'HELLO' ESCAPE '\\'`)
+	if err == nil {
+		t.Error("want error")
+	}
+	if !errors.Is(err, sqlite3.ERROR) {
+		t.Errorf("got %v, want sqlite3.ERROR", err)
+	}
+
+	err = db.Exec(`SELECT icu_load_collation('enUS', 'error')`)
+	if err == nil {
+		t.Error("want error")
+	}
+	if !errors.Is(err, sqlite3.ERROR) {
+		t.Errorf("got %v, want sqlite3.ERROR", err)
+	}
+
+	err = db.Exec(`SELECT icu_load_collation('enUS', '')`)
+	if err != nil {
+		t.Error(err)
+	}
+
+	err = db.Close()
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func Test_like2regex(t *testing.T) {
+	const prefix = `(?is)\A`
+	const sufix = `\z`
+	tests := []struct {
+		pattern string
+		escape  rune
+		want    string
+	}{
+		{`a`, -1, `a`},
+		{`a.`, -1, `a\.`},
+		{`a%`, -1, `a.*`},
+		{`a\`, -1, `a\\`},
+		{`a_b`, -1, `a.b`},
+		{`a|b`, '|', `ab`},
+		{`a|_`, '|', `a_`},
+	}
+	for _, tt := range tests {
+		t.Run(tt.pattern, func(t *testing.T) {
+			want := prefix + tt.want + sufix
+			if got := like2regex(tt.pattern, tt.escape); got != want {
+				t.Errorf("like2regex() = %q, want %q", got, want)
+			}
+		})
+	}
+}

func.go

@@ -0,0 +1,172 @@
+package sqlite3
+
+import (
+	"context"
+
+	"github.com/ncruces/go-sqlite3/internal/util"
+	"github.com/tetratelabs/wazero/api"
+)
+
+// AnyCollationNeeded registers a fake collating function
+// for any unknown collating sequence.
+// The fake collating function works like BINARY.
+//
+// This can be used to load schemas that contain
+// one or more unknown collating sequences.
+func (c *Conn) AnyCollationNeeded() {
+	c.call(c.api.anyCollation, uint64(c.handle), 0, 0)
+}
+
+// CreateCollation defines a new collating sequence.
+//
+// https://sqlite.org/c3ref/create_collation.html
+func (c *Conn) CreateCollation(name string, fn func(a, b []byte) int) error {
+	defer c.arena.reset()
+	namePtr := c.arena.string(name)
+	funcPtr := util.AddHandle(c.ctx, fn)
+	r := c.call(c.api.createCollation,
+		uint64(c.handle), uint64(namePtr), uint64(funcPtr))
+	return c.error(r)
+}
+
+// CreateFunction defines a new scalar SQL function.
+//
+// https://sqlite.org/c3ref/create_function.html
+func (c *Conn) CreateFunction(name string, nArg int, flag FunctionFlag, fn func(ctx Context, arg ...Value)) error {
+	defer c.arena.reset()
+	namePtr := c.arena.string(name)
+	funcPtr := util.AddHandle(c.ctx, fn)
+	r := c.call(c.api.createFunction,
+		uint64(c.handle), uint64(namePtr), uint64(nArg),
+		uint64(flag), uint64(funcPtr))
+	return c.error(r)
+}
+
+// CreateWindowFunction defines a new aggregate or aggregate window SQL function.
+// If fn returns a [WindowFunction], then an aggregate window function is created.
+// If fn returns an [io.Closer], it will be called to free resources.
+//
+// https://sqlite.org/c3ref/create_function.html
+func (c *Conn) CreateWindowFunction(name string, nArg int, flag FunctionFlag, fn func() AggregateFunction) error {
+	defer c.arena.reset()
+	call := c.api.createAggregate
+	namePtr := c.arena.string(name)
+	funcPtr := util.AddHandle(c.ctx, fn)
+	if _, ok := fn().(WindowFunction); ok {
+		call = c.api.createWindow
+	}
+	r := c.call(call,
+		uint64(c.handle), uint64(namePtr), uint64(nArg),
+		uint64(flag), uint64(funcPtr))
+	return c.error(r)
+}
+
+// AggregateFunction is the interface an aggregate function should implement.
+//
+// https://sqlite.org/appfunc.html
+type AggregateFunction interface {
+	// Step is invoked to add a row to the current window.
+	// The function arguments, if any, corresponding to the row being added are passed to Step.
+	Step(ctx Context, arg ...Value)
+
+	// Value is invoked to return the current (or final) value of the aggregate.
+	Value(ctx Context)
+}
+
+// WindowFunction is the interface an aggregate window function should implement.
+//
+// https://sqlite.org/windowfunctions.html
+type WindowFunction interface {
+	AggregateFunction
+
+	// Inverse is invoked to remove the oldest presently aggregated result of Step from the current window.
+	// The function arguments, if any, are those passed to Step for the row being removed.
+	Inverse(ctx Context, arg ...Value)
+}
+
+func destroyCallback(ctx context.Context, mod api.Module, pApp uint32) {
+	util.DelHandle(ctx, pApp)
+}
+
+func compareCallback(ctx context.Context, mod api.Module, pApp, nKey1, pKey1, nKey2, pKey2 uint32) uint32 {
+	fn := util.GetHandle(ctx, pApp).(func(a, b []byte) int)
+	return uint32(fn(util.View(mod, pKey1, uint64(nKey1)), util.View(mod, pKey2, uint64(nKey2))))
+}
+
+func funcCallback(ctx context.Context, mod api.Module, pCtx, nArg, pArg uint32) {
+	db := ctx.Value(connKey{}).(*Conn)
+	fn := userDataHandle(db, pCtx).(func(ctx Context, arg ...Value))
+	fn(Context{db, pCtx}, callbackArgs(db, nArg, pArg)...)
+}
+
+func stepCallback(ctx context.Context, mod api.Module, pCtx, nArg, pArg uint32) {
+	db := ctx.Value(connKey{}).(*Conn)
+	fn := aggregateCtxHandle(db, pCtx, nil)
+	fn.Step(Context{db, pCtx}, callbackArgs(db, nArg, pArg)...)
+}
+
+func finalCallback(ctx context.Context, mod api.Module, pCtx uint32) {
+	var handle uint32
+	db := ctx.Value(connKey{}).(*Conn)
+	fn := aggregateCtxHandle(db, pCtx, &handle)
+	fn.Value(Context{db, pCtx})
+	if err := util.DelHandle(ctx, handle); err != nil {
+		Context{db, pCtx}.ResultError(err)
+	}
+}
+
+func valueCallback(ctx context.Context, mod api.Module, pCtx uint32) {
+	db := ctx.Value(connKey{}).(*Conn)
+	fn := aggregateCtxHandle(db, pCtx, nil)
+	fn.Value(Context{db, pCtx})
+}
+
+func inverseCallback(ctx context.Context, mod api.Module, pCtx, nArg, pArg uint32) {
+	db := ctx.Value(connKey{}).(*Conn)
+	fn := aggregateCtxHandle(db, pCtx, nil).(WindowFunction)
+	fn.Inverse(Context{db, pCtx}, callbackArgs(db, nArg, pArg)...)
+}
+
+func userDataHandle(db *Conn, pCtx uint32) any {
+	pApp := uint32(db.call(db.api.userData, uint64(pCtx)))
+	return util.GetHandle(db.ctx, pApp)
+}
+
+func aggregateCtxHandle(db *Conn, pCtx uint32, close *uint32) AggregateFunction {
+	// On close, we're getting rid of the aggregate.
+	// Don't allocate space to store it.
+	var size uint64
+	if close == nil {
+		size = ptrlen
+	}
+	ptr := uint32(db.call(db.api.aggregateCtx, uint64(pCtx), size))
+
+	// If we already have an aggregate, return it.
+	if ptr != 0 {
+		if handle := util.ReadUint32(db.mod, ptr); handle != 0 {
+			fn := util.GetHandle(db.ctx, handle).(AggregateFunction)
+			if close != nil {
+				*close = handle
+			}
+			return fn
+		}
+	}
+
+	// Create a new aggregate, and store it if needed.
+	fn := userDataHandle(db, pCtx).(func() AggregateFunction)()
+	if ptr != 0 {
+		util.WriteUint32(db.mod, ptr, util.AddHandle(db.ctx, fn))
+	}
+	return fn
+}
+
+func callbackArgs(db *Conn, nArg, pArg uint32) []Value {
+	args := make([]Value, nArg)
+	for i := range args {
+		args[i] = Value{
+			sqlite: db.sqlite,
+			handle: util.ReadUint32(db.mod, pArg+ptrlen*uint32(i)),
+		}
+	}
+	return args
+}

func_test.go

@@ -0,0 +1,154 @@
+package sqlite3_test
+
+import (
+	"bytes"
+	"fmt"
+	"log"
+	"regexp"
+
+	"golang.org/x/text/collate"
+	"golang.org/x/text/language"
+
+	"github.com/ncruces/go-sqlite3"
+	_ "github.com/ncruces/go-sqlite3/embed"
+)
+
+func ExampleConn_CreateCollation() {
+	db, err := sqlite3.Open(":memory:")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer db.Close()
+
+	err = db.Exec(`CREATE TABLE IF NOT EXISTS words (word VARCHAR(10))`)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	err = db.Exec(`INSERT INTO words (word) VALUES ('côte'), ('cote'), ('coter'), ('coté'), ('cotée'), ('côté')`)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	err = db.CreateCollation("french", collate.New(language.French).Compare)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	stmt, _, err := db.Prepare(`SELECT word FROM words ORDER BY word COLLATE french`)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer stmt.Close()
+
+	for stmt.Step() {
+		fmt.Println(stmt.ColumnText(0))
+	}
+	if err := stmt.Err(); err != nil {
+		log.Fatal(err)
+	}
+	// Output:
+	// cote
+	// coté
+	// côte
+	// côté
+	// cotée
+	// coter
+}
+
+func ExampleConn_CreateFunction() {
+	db, err := sqlite3.Open(":memory:")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer db.Close()
+
+	err = db.Exec(`CREATE TABLE IF NOT EXISTS words (word VARCHAR(10))`)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	err = db.Exec(`INSERT INTO words (word) VALUES ('côte'), ('cote'), ('coter'), ('coté'), ('cotée'), ('côté')`)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	err = db.CreateFunction("upper", 1, sqlite3.DETERMINISTIC|sqlite3.INNOCUOUS, func(ctx sqlite3.Context, arg ...sqlite3.Value) {
+		ctx.ResultRawText(bytes.ToUpper(arg[0].RawText()))
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	stmt, _, err := db.Prepare(`SELECT upper(word) FROM words`)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer stmt.Close()
+
+	for stmt.Step() {
+		fmt.Println(stmt.ColumnText(0))
+	}
+	if err := stmt.Err(); err != nil {
+		log.Fatal(err)
+	}
+	// Unordered output:
+	// COTE
+	// COTÉ
+	// CÔTE
+	// CÔTÉ
+	// COTÉE
+	// COTER
+}
+
+func ExampleContext_SetAuxData() {
+	db, err := sqlite3.Open(":memory:")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer db.Close()
+
+	err = db.Exec(`CREATE TABLE IF NOT EXISTS words (word VARCHAR(10))`)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	err = db.Exec(`INSERT INTO words (word) VALUES ('côte'), ('cote'), ('coter'), ('coté'), ('cotée'), ('côté')`)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	err = db.CreateFunction("regexp", 2, sqlite3.DETERMINISTIC|sqlite3.INNOCUOUS, func(ctx sqlite3.Context, arg ...sqlite3.Value) {
+		re, ok := ctx.GetAuxData(0).(*regexp.Regexp)
+		if !ok {
+			r, err := regexp.Compile(arg[0].Text())
+			if err != nil {
+				ctx.ResultError(err)
+				return
+			}
+			ctx.SetAuxData(0, r)
+			re = r
+		}
+		ctx.ResultBool(re.Match(arg[1].RawBlob()))
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	stmt, _, err := db.Prepare(`SELECT word FROM words WHERE word REGEXP '^\p{L}+e$'`)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer stmt.Close()
+
+	for stmt.Step() {
+		fmt.Println(stmt.ColumnText(0))
+	}
+	if err := stmt.Err(); err != nil {
+		log.Fatal(err)
+	}
+	// Unordered output:
+	// cote
+	// côte
+	// cotée
+}

func_win_test.go

@@ -0,0 +1,87 @@
+package sqlite3_test
+
+import (
+	"fmt"
+	"log"
+	"unicode"
+
+	"github.com/ncruces/go-sqlite3"
+	_ "github.com/ncruces/go-sqlite3/embed"
+)
+
+func ExampleConn_CreateWindowFunction() {
+	db, err := sqlite3.Open(":memory:")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer db.Close()
+
+	err = db.Exec(`CREATE TABLE IF NOT EXISTS words (word VARCHAR(10))`)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	err = db.Exec(`INSERT INTO words (word) VALUES ('côte'), ('cote'), ('coter'), ('coté'), ('cotée'), ('côté')`)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	err = db.CreateWindowFunction("count_ascii", 1, sqlite3.DETERMINISTIC|sqlite3.INNOCUOUS, newASCIICounter)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	stmt, _, err := db.Prepare(`SELECT count_ascii(word) OVER (ROWS BETWEEN 1 PRECEDING AND 1 FOLLOWING) FROM words`)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer stmt.Close()
+
+	for stmt.Step() {
+		fmt.Println(stmt.ColumnInt(0))
+	}
+	if err := stmt.Err(); err != nil {
+		log.Fatal(err)
+	}
+	// Output:
+	// 1
+	// 2
+	// 2
+	// 1
+	// 0
+	// 0
+}
+
+type countASCII struct{ result int }
+
+func newASCIICounter() sqlite3.AggregateFunction {
+	return &countASCII{}
+}
+
+func (f *countASCII) Value(ctx sqlite3.Context) {
+	ctx.ResultInt(f.result)
+}
+
+func (f *countASCII) Step(ctx sqlite3.Context, arg ...sqlite3.Value) {
+	if f.isASCII(arg[0]) {
+		f.result++
+	}
+}
+
+func (f *countASCII) Inverse(ctx sqlite3.Context, arg ...sqlite3.Value) {
+	if f.isASCII(arg[0]) {
+		f.result--
+	}
+}
+
+func (f *countASCII) isASCII(arg sqlite3.Value) bool {
+	if arg.Type() != sqlite3.TEXT {
+		return false
+	}
+	for _, c := range arg.RawBlob() {
+		if c > unicode.MaxASCII {
+			return false
+		}
+	}
+	return true
+}

go.mod

@@ -1,13 +1,14 @@
 module github.com/ncruces/go-sqlite3
 
-go 1.19
+go 1.21
 
 require (
-	github.com/ncruces/julianday v0.1.5
+	github.com/ncruces/julianday v1.0.0
 	github.com/psanford/httpreadat v0.1.0
-	github.com/tetratelabs/wazero v1.2.0
-	golang.org/x/sync v0.2.0
-	golang.org/x/sys v0.8.0
+	github.com/tetratelabs/wazero v1.5.0
+	golang.org/x/sync v0.5.0
+	golang.org/x/sys v0.14.0
+	golang.org/x/text v0.14.0
 )
 
 retract v0.4.0 // tagged from the wrong branch

go.sum

@@ -1,10 +1,12 @@
-github.com/ncruces/julianday v0.1.5 h1:hDJ9ejiMp3DHsoZ5KW4c1lwfMjbARS7u/gbYcd0FBZk=
-github.com/ncruces/julianday v0.1.5/go.mod h1:Dusn2KvZrrovOMJuOt0TNXL6tB7U2E8kvza5fFc9G7g=
+github.com/ncruces/julianday v1.0.0 h1:fH0OKwa7NWvniGQtxdJRxAgkBMolni2BjDHaWTxqt7M=
+github.com/ncruces/julianday v1.0.0/go.mod h1:Dusn2KvZrrovOMJuOt0TNXL6tB7U2E8kvza5fFc9G7g=
 github.com/psanford/httpreadat v0.1.0 h1:VleW1HS2zO7/4c7c7zNl33fO6oYACSagjJIyMIwZLUE=
 github.com/psanford/httpreadat v0.1.0/go.mod h1:Zg7P+TlBm3bYbyHTKv/EdtSJZn3qwbPwpfZ/I9GKCRE=
-github.com/tetratelabs/wazero v1.2.0 h1:I/8LMf4YkCZ3r2XaL9whhA0VMyAvF6QE+O7rco0DCeQ=
-github.com/tetratelabs/wazero v1.2.0/go.mod h1:wYx2gNRg8/WihJfSDxA1TIL8H+GkfLYm+bIfbblu9VQ=
-golang.org/x/sync v0.2.0 h1:PUR+T4wwASmuSTYdKjYHI5TD22Wy5ogLU5qZCOLxBrI=
-golang.org/x/sync v0.2.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sys v0.8.0 h1:EBmGv8NaZBZTWvrbjNoL6HVt+IVy3QDQpJs7VRIw3tU=
-golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+github.com/tetratelabs/wazero v1.5.0 h1:Yz3fZHivfDiZFUXnWMPUoiW7s8tC1sjdBtlJn08qYa0=
+github.com/tetratelabs/wazero v1.5.0/go.mod h1:0U0G41+ochRKoPKCJlh0jMg1CHkyfK8kDqiirMmKY8A=
+golang.org/x/sync v0.5.0 h1:60k92dhOjHxJkrqnwsfl8KuaHbn/5dl0lUPUklKo3qE=
+golang.org/x/sync v0.5.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/sys v0.14.0 h1:Vz7Qs629MkJkGyHxUlRHizWJRG2j8fbQKjELVSNhy7Q=
+golang.org/x/sys v0.14.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
+golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=

go.work

@@ -0,0 +1,6 @@
+go 1.21
+
+use (
+	.
+	./gormlite
+)

go.work.sum

@@ -0,0 +1,4 @@
+golang.org/x/mod v0.8.0 h1:LUYupSeNrTNCGzR/hVBk2NHZO4hXcVaW1k4Qx7rjPx8=
+golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
+golang.org/x/tools v0.6.0 h1:BOw41kyTf3PuCW1pVQf8+Cyg8pMlkYB1oo9iJ6D/lKM=
+golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=

gormlite/LICENSE

@@ -0,0 +1,22 @@
+MIT License
+
+Copyright (c) 2023 Nuno Cruces
+Copyright (c) 2023 Jinzhu <wosmvp@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

gormlite/README.md

@@ -0,0 +1,17 @@
+# GORM SQLite Driver
+
+[![Go Reference](https://pkg.go.dev/badge/image)](https://pkg.go.dev/github.com/ncruces/go-sqlite3/gormlite)
+
+## Usage
+
+```go
+import (
+	_ "github.com/ncruces/go-sqlite3/embed"
+	"github.com/ncruces/go-sqlite3/gormlite"
+	"gorm.io/gorm"
+)
+
+db, err := gorm.Open(gormlite.Open("gorm.db"), &gorm.Config{})
+```
+
+Checkout [https://gorm.io](https://gorm.io) for details.

gormlite/ddlmod.go

@@ -0,0 +1,297 @@
+package gormlite
+
+import (
+	"database/sql"
+	"errors"
+	"fmt"
+	"regexp"
+	"strconv"
+	"strings"
+
+	"gorm.io/gorm/migrator"
+)
+
+var (
+	sqliteSeparator    = "`|\"|'|\t"
+	indexRegexp        = regexp.MustCompile(fmt.Sprintf(`(?is)CREATE(?: UNIQUE)? INDEX [%v]?[\w\d-]+[%v]?(?s:.*?)ON (.*)$`, sqliteSeparator, sqliteSeparator))
+	tableRegexp        = regexp.MustCompile(fmt.Sprintf(`(?is)(CREATE TABLE [%v]?[\w\d-]+[%v]?)(?:\s*\((.*)\))?`, sqliteSeparator, sqliteSeparator))
+	separatorRegexp    = regexp.MustCompile(fmt.Sprintf("[%v]", sqliteSeparator))
+	columnsRegexp      = regexp.MustCompile(fmt.Sprintf(`[(,][%v]?(\w+)[%v]?`, sqliteSeparator, sqliteSeparator))
+	columnRegexp       = regexp.MustCompile(fmt.Sprintf(`^[%v]?([\w\d]+)[%v]?\s+([\w\(\)\d]+)(.*)$`, sqliteSeparator, sqliteSeparator))
+	defaultValueRegexp = regexp.MustCompile(`(?i) DEFAULT \(?(.+)?\)?( |COLLATE|GENERATED|$)`)
+	regRealDataType    = regexp.MustCompile(`[^\d](\d+)[^\d]?`)
+)
+
+func getAllColumns(s string) []string {
+	allMatches := columnsRegexp.FindAllStringSubmatch(s, -1)
+	columns := make([]string, 0, len(allMatches))
+	for _, matches := range allMatches {
+		if len(matches) > 1 {
+			columns = append(columns, matches[1])
+		}
+	}
+	return columns
+}
+
+type ddl struct {
+	head    string
+	fields  []string
+	columns []migrator.ColumnType
+}
+
+func parseDDL(strs ...string) (*ddl, error) {
+	var result ddl
+	for _, str := range strs {
+		if sections := tableRegexp.FindStringSubmatch(str); len(sections) > 0 {
+			var (
+				ddlBody      = sections[2]
+				ddlBodyRunes = []rune(ddlBody)
+				bracketLevel int
+				quote        rune
+				buf          string
+			)
+			ddlBodyRunesLen := len(ddlBodyRunes)
+
+			result.head = sections[1]
+
+			for idx := 0; idx < ddlBodyRunesLen; idx++ {
+				var (
+					next rune = 0
+					c         = ddlBodyRunes[idx]
+				)
+				if idx+1 < ddlBodyRunesLen {
+					next = ddlBodyRunes[idx+1]
+				}
+
+				if sc := string(c); separatorRegexp.MatchString(sc) {
+					if c == next {
+						buf += sc // Skip escaped quote
+						idx++
+					} else if quote > 0 {
+						quote = 0
+					} else {
+						quote = c
+					}
+				} else if quote == 0 {
+					if c == '(' {
+						bracketLevel++
+					} else if c == ')' {
+						bracketLevel--
+					} else if bracketLevel == 0 {
+						if c == ',' {
+							result.fields = append(result.fields, strings.TrimSpace(buf))
+							buf = ""
+							continue
+						}
+					}
+				}
+
+				if bracketLevel < 0 {
+					return nil, errors.New("invalid DDL, unbalanced brackets")
+				}
+
+				buf += string(c)
+			}
+
+			if bracketLevel != 0 {
+				return nil, errors.New("invalid DDL, unbalanced brackets")
+			}
+
+			if buf != "" {
+				result.fields = append(result.fields, strings.TrimSpace(buf))
+			}
+
+			for _, f := range result.fields {
+				fUpper := strings.ToUpper(f)
+				if strings.HasPrefix(fUpper, "CHECK") ||
+					strings.HasPrefix(fUpper, "CONSTRAINT") {
+					continue
+				}
+
+				if strings.HasPrefix(fUpper, "PRIMARY KEY") {
+					for _, name := range getAllColumns(f) {
+						for idx, column := range result.columns {
+							if column.NameValue.String == name {
+								column.PrimaryKeyValue = sql.NullBool{Bool: true, Valid: true}
+								result.columns[idx] = column
+								break
+							}
+						}
+					}
+				} else if matches := columnRegexp.FindStringSubmatch(f); len(matches) > 0 {
+					columnType := migrator.ColumnType{
+						NameValue:         sql.NullString{String: matches[1], Valid: true},
+						DataTypeValue:     sql.NullString{String: matches[2], Valid: true},
+						ColumnTypeValue:   sql.NullString{String: matches[2], Valid: true},
+						PrimaryKeyValue:   sql.NullBool{Valid: true},
+						UniqueValue:       sql.NullBool{Valid: true},
+						NullableValue:     sql.NullBool{Bool: true, Valid: true},
+						DefaultValueValue: sql.NullString{Valid: false},
+					}
+
+					matchUpper := strings.ToUpper(matches[3])
+					if strings.Contains(matchUpper, " NOT NULL") {
+						columnType.NullableValue = sql.NullBool{Bool: false, Valid: true}
+					} else if strings.Contains(matchUpper, " NULL") {
+						columnType.NullableValue = sql.NullBool{Bool: true, Valid: true}
+					}
+					if strings.Contains(matchUpper, " UNIQUE") {
+						columnType.UniqueValue = sql.NullBool{Bool: true, Valid: true}
+					}
+					if strings.Contains(matchUpper, " PRIMARY") {
+						columnType.PrimaryKeyValue = sql.NullBool{Bool: true, Valid: true}
+					}
+					if defaultMatches := defaultValueRegexp.FindStringSubmatch(matches[3]); len(defaultMatches) > 1 {
+						if strings.ToLower(defaultMatches[1]) != "null" {
+							columnType.DefaultValueValue = sql.NullString{String: strings.Trim(defaultMatches[1], `"`), Valid: true}
+						}
+					}
+
+					// data type length
+					matches := regRealDataType.FindAllStringSubmatch(columnType.DataTypeValue.String, -1)
+					if len(matches) == 1 && len(matches[0]) == 2 {
+						size, _ := strconv.Atoi(matches[0][1])
+						columnType.LengthValue = sql.NullInt64{Valid: true, Int64: int64(size)}
+						columnType.DataTypeValue.String = strings.TrimSuffix(columnType.DataTypeValue.String, matches[0][0])
+					}
+
+					result.columns = append(result.columns, columnType)
+				}
+			}
+		} else if matches := indexRegexp.FindStringSubmatch(str); len(matches) > 0 {
+			for _, column := range getAllColumns(matches[1]) {
+				for idx, c := range result.columns {
+					if c.NameValue.String == column {
+						c.UniqueValue = sql.NullBool{Bool: strings.ToUpper(strings.Fields(str)[1]) == "UNIQUE", Valid: true}
+						result.columns[idx] = c
+					}
+				}
+			}
+		} else {
+			return nil, errors.New("invalid DDL")
+		}
+	}
+
+	return &result, nil
+}
+
+func (d *ddl) clone() *ddl {
+	copied := new(ddl)
+	*copied = *d
+
+	copied.fields = make([]string, len(d.fields))
+	copy(copied.fields, d.fields)
+	copied.columns = make([]migrator.ColumnType, len(d.columns))
+	copy(copied.columns, d.columns)
+
+	return copied
+}
+
+func (d *ddl) compile() string {
+	if len(d.fields) == 0 {
+		return d.head
+	}
+
+	return fmt.Sprintf("%s (%s)", d.head, strings.Join(d.fields, ","))
+}
+
+func (d *ddl) renameTable(dst, src string) error {
+	tableReg, err := regexp.Compile("\\s*('|`|\")?\\b" + regexp.QuoteMeta(src) + "\\b('|`|\")?\\s*")
+	if err != nil {
+		return err
+	}
+
+	replaced := tableReg.ReplaceAllString(d.head, fmt.Sprintf(" `%s` ", dst))
+	if replaced == d.head {
+		return fmt.Errorf("failed to look up tablename `%s` from DDL head '%s'", src, d.head)
+	}
+
+	d.head = replaced
+	return nil
+}
+
+func (d *ddl) addConstraint(name string, sql string) {
+	reg := regexp.MustCompile("^CONSTRAINT [\"`]?" + regexp.QuoteMeta(name) + "[\"` ]")
+
+	for i := 0; i < len(d.fields); i++ {
+		if reg.MatchString(d.fields[i]) {
+			d.fields[i] = sql
+			return
+		}
+	}
+
+	d.fields = append(d.fields, sql)
+}
+
+func (d *ddl) removeConstraint(name string) bool {
+	reg := regexp.MustCompile("^CONSTRAINT [\"`]?" + regexp.QuoteMeta(name) + "[\"` ]")
+
+	for i := 0; i < len(d.fields); i++ {
+		if reg.MatchString(d.fields[i]) {
+			d.fields = append(d.fields[:i], d.fields[i+1:]...)
+			return true
+		}
+	}
+	return false
+}
+
+//lint:ignore U1000 ignore unused code.
+func (d *ddl) hasConstraint(name string) bool {
+	reg := regexp.MustCompile("^CONSTRAINT [\"`]?" + regexp.QuoteMeta(name) + "[\"` ]")
+
+	for _, f := range d.fields {
+		if reg.MatchString(f) {
+			return true
+		}
+	}
+	return false
+}
+
+func (d *ddl) getColumns() []string {
+	res := []string{}
+
+	for _, f := range d.fields {
+		fUpper := strings.ToUpper(f)
+		if strings.HasPrefix(fUpper, "PRIMARY KEY") ||
+			strings.HasPrefix(fUpper, "CHECK") ||
+			strings.HasPrefix(fUpper, "CONSTRAINT") ||
+			strings.Contains(fUpper, "GENERATED ALWAYS AS") {
+			continue
+		}
+
+		reg := regexp.MustCompile("^[\"`']?([\\w\\d]+)[\"`']?")
+		match := reg.FindStringSubmatch(f)
+
+		if match != nil {
+			res = append(res, "`"+match[1]+"`")
+		}
+	}
+	return res
+}
+
+func (d *ddl) alterColumn(name, sql string) bool {
+	reg := regexp.MustCompile("^(`|'|\"| )" + regexp.QuoteMeta(name) + "(`|'|\"| ) .*?$")
+
+	for i := 0; i < len(d.fields); i++ {
+		if reg.MatchString(d.fields[i]) {
+			d.fields[i] = sql
+			return false
+		}
+	}
+
+	d.fields = append(d.fields, sql)
+	return true
+}
+
+func (d *ddl) removeColumn(name string) bool {
+	reg := regexp.MustCompile("^(`|'|\"| )" + regexp.QuoteMeta(name) + "(`|'|\"| ) .*?$")
+
+	for i := 0; i < len(d.fields); i++ {
+		if reg.MatchString(d.fields[i]) {
+			d.fields = append(d.fields[:i], d.fields[i+1:]...)
+			return true
+		}
+	}
+
+	return false
+}

gormlite/ddlmod_test.go

@@ -0,0 +1,370 @@
+package gormlite
+
+import (
+	"database/sql"
+	"testing"
+
+	"gorm.io/gorm/migrator"
+	"gorm.io/gorm/utils/tests"
+)
+
+func TestParseDDL(t *testing.T) {
+	params := []struct {
+		name    string
+		sql     []string
+		nFields int
+		columns []migrator.ColumnType
+	}{
+		{"with_fk", []string{
+			"CREATE TABLE `notes` (`id` integer NOT NULL,`text` varchar(500) DEFAULT \"hello\",`age` integer DEFAULT 18,`user_id` integer,PRIMARY KEY (`id`),CONSTRAINT `fk_users_notes` FOREIGN KEY (`user_id`) REFERENCES `users`(`id`))",
+			"CREATE UNIQUE INDEX `idx_profiles_refer` ON `profiles`(`text`)",
+		}, 6, []migrator.ColumnType{
+			{NameValue: sql.NullString{String: "id", Valid: true}, DataTypeValue: sql.NullString{String: "integer", Valid: true}, ColumnTypeValue: sql.NullString{String: "integer", Valid: true}, PrimaryKeyValue: sql.NullBool{Bool: true, Valid: true}, NullableValue: sql.NullBool{Valid: true}, UniqueValue: sql.NullBool{Valid: true}, DefaultValueValue: sql.NullString{Valid: false}},
+			{NameValue: sql.NullString{String: "text", Valid: true}, DataTypeValue: sql.NullString{String: "varchar", Valid: true}, LengthValue: sql.NullInt64{Int64: 500, Valid: true}, ColumnTypeValue: sql.NullString{String: "varchar(500)", Valid: true}, DefaultValueValue: sql.NullString{String: "hello", Valid: true}, NullableValue: sql.NullBool{Bool: true, Valid: true}, UniqueValue: sql.NullBool{Bool: true, Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
+			{NameValue: sql.NullString{String: "age", Valid: true}, DataTypeValue: sql.NullString{String: "integer", Valid: true}, ColumnTypeValue: sql.NullString{String: "integer", Valid: true}, DefaultValueValue: sql.NullString{String: "18", Valid: true}, NullableValue: sql.NullBool{Bool: true, Valid: true}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
+			{NameValue: sql.NullString{String: "user_id", Valid: true}, DataTypeValue: sql.NullString{String: "integer", Valid: true}, ColumnTypeValue: sql.NullString{String: "integer", Valid: true}, DefaultValueValue: sql.NullString{Valid: false}, NullableValue: sql.NullBool{Bool: true, Valid: true}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
+		},
+		},
+		{"with_check", []string{"CREATE TABLE Persons (ID int NOT NULL,LastName varchar(255) NOT NULL,FirstName varchar(255),Age int,CHECK (Age>=18),CHECK (FirstName<>'John'))"}, 6, []migrator.ColumnType{
+			{NameValue: sql.NullString{String: "ID", Valid: true}, DataTypeValue: sql.NullString{String: "int", Valid: true}, ColumnTypeValue: sql.NullString{String: "int", Valid: true}, NullableValue: sql.NullBool{Valid: true}, DefaultValueValue: sql.NullString{Valid: false}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
+			{NameValue: sql.NullString{String: "LastName", Valid: true}, DataTypeValue: sql.NullString{String: "varchar", Valid: true}, LengthValue: sql.NullInt64{Int64: 255, Valid: true}, ColumnTypeValue: sql.NullString{String: "varchar(255)", Valid: true}, NullableValue: sql.NullBool{Bool: false, Valid: true}, DefaultValueValue: sql.NullString{Valid: false}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
+			{NameValue: sql.NullString{String: "FirstName", Valid: true}, DataTypeValue: sql.NullString{String: "varchar", Valid: true}, LengthValue: sql.NullInt64{Int64: 255, Valid: true}, ColumnTypeValue: sql.NullString{String: "varchar(255)", Valid: true}, DefaultValueValue: sql.NullString{Valid: false}, NullableValue: sql.NullBool{Bool: true, Valid: true}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
+			{NameValue: sql.NullString{String: "Age", Valid: true}, DataTypeValue: sql.NullString{String: "int", Valid: true}, ColumnTypeValue: sql.NullString{String: "int", Valid: true}, DefaultValueValue: sql.NullString{Valid: false}, NullableValue: sql.NullBool{Bool: true, Valid: true}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
+		}},
+		{"lowercase", []string{"create table test (ID int NOT NULL)"}, 1, []migrator.ColumnType{
+			{NameValue: sql.NullString{String: "ID", Valid: true}, DataTypeValue: sql.NullString{String: "int", Valid: true}, ColumnTypeValue: sql.NullString{String: "int", Valid: true}, NullableValue: sql.NullBool{Bool: false, Valid: true}, DefaultValueValue: sql.NullString{Valid: false}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
+		},
+		},
+		{"no brackets", []string{"create table test"}, 0, nil},
+		{"with_special_characters", []string{
+			"CREATE TABLE `test` (`text` varchar(10) DEFAULT \"测试, \")",
+		}, 1, []migrator.ColumnType{
+			{NameValue: sql.NullString{String: "text", Valid: true}, DataTypeValue: sql.NullString{String: "varchar", Valid: true}, LengthValue: sql.NullInt64{Int64: 10, Valid: true}, ColumnTypeValue: sql.NullString{String: "varchar(10)", Valid: true}, DefaultValueValue: sql.NullString{String: "测试, ", Valid: true}, NullableValue: sql.NullBool{Bool: true, Valid: true}, UniqueValue: sql.NullBool{Valid: true}, PrimaryKeyValue: sql.NullBool{Valid: true}},
+		},
+		},
+		{
+			"table_name_with_dash",
+			[]string{
+				"CREATE TABLE `test-a` (`id` int NOT NULL)",
+				"CREATE UNIQUE INDEX `idx_test-a_id` ON `test-a`(`id`)",
+			},
+			1,
+			[]migrator.ColumnType{
+				{
+					NameValue:         sql.NullString{String: "id", Valid: true},
+					DataTypeValue:     sql.NullString{String: "int", Valid: true},
+					ColumnTypeValue:   sql.NullString{String: "int", Valid: true},
+					NullableValue:     sql.NullBool{Bool: false, Valid: true},
+					DefaultValueValue: sql.NullString{Valid: false},
+					UniqueValue:       sql.NullBool{Bool: true, Valid: true},
+					PrimaryKeyValue:   sql.NullBool{Valid: true},
+				},
+			},
+		},
+		{
+			"unique index",
+			[]string{
+				"CREATE TABLE `test-b` (`field` integer NOT NULL)",
+				"CREATE UNIQUE INDEX `idx_uq` ON `test-b`(`field`) WHERE field = 0",
+			},
+			1,
+			[]migrator.ColumnType{
+				{
+					NameValue:       sql.NullString{String: "field", Valid: true},
+					DataTypeValue:   sql.NullString{String: "integer", Valid: true},
+					ColumnTypeValue: sql.NullString{String: "integer", Valid: true},
+					PrimaryKeyValue: sql.NullBool{Bool: false, Valid: true},
+					UniqueValue:     sql.NullBool{Bool: true, Valid: true},
+					NullableValue:   sql.NullBool{Bool: false, Valid: true},
+				},
+			},
+		},
+		{
+			"non-unique index",
+			[]string{
+				"CREATE TABLE `test-c` (`field` integer NOT NULL)",
+				"CREATE INDEX `idx_uq` ON `test-b`(`field`) WHERE field = 0",
+			},
+			1,
+			[]migrator.ColumnType{
+				{
+					NameValue:       sql.NullString{String: "field", Valid: true},
+					DataTypeValue:   sql.NullString{String: "integer", Valid: true},
+					ColumnTypeValue: sql.NullString{String: "integer", Valid: true},
+					PrimaryKeyValue: sql.NullBool{Bool: false, Valid: true},
+					UniqueValue:     sql.NullBool{Bool: false, Valid: true},
+					NullableValue:   sql.NullBool{Bool: false, Valid: true},
+				},
+			},
+		},
+		{
+			"index with \n from .schema sqlite",
+			[]string{
+				"CREATE TABLE `test-d` (`field` integer NOT NULL)",
+				"CREATE INDEX `idx_uq`\n    ON `test-b`(`field`) WHERE field = 0",
+			},
+			1,
+			[]migrator.ColumnType{
+				{
+					NameValue:       sql.NullString{String: "field", Valid: true},
+					DataTypeValue:   sql.NullString{String: "integer", Valid: true},
+					ColumnTypeValue: sql.NullString{String: "integer", Valid: true},
+					PrimaryKeyValue: sql.NullBool{Bool: false, Valid: true},
+					UniqueValue:     sql.NullBool{Bool: false, Valid: true},
+					NullableValue:   sql.NullBool{Bool: false, Valid: true},
+				},
+			},
+		},
+	}
+
+	for _, p := range params {
+		t.Run(p.name, func(t *testing.T) {
+			ddl, err := parseDDL(p.sql...)
+
+			if err != nil {
+				panic(err.Error())
+			}
+
+			tests.AssertEqual(t, p.sql[0], ddl.compile())
+			if len(ddl.fields) != p.nFields {
+				t.Fatalf("fields length doesn't match: expect: %v, got %v", p.nFields, len(ddl.fields))
+			}
+			tests.AssertEqual(t, ddl.columns, p.columns)
+		})
+	}
+}
+
+func TestParseDDL_Whitespaces(t *testing.T) {
+	testColumns := []migrator.ColumnType{
+		{
+			NameValue:         sql.NullString{String: "id", Valid: true},
+			DataTypeValue:     sql.NullString{String: "integer", Valid: true},
+			ColumnTypeValue:   sql.NullString{String: "integer", Valid: true},
+			NullableValue:     sql.NullBool{Bool: true, Valid: true},
+			DefaultValueValue: sql.NullString{Valid: false},
+			UniqueValue:       sql.NullBool{Bool: true, Valid: true},
+			PrimaryKeyValue:   sql.NullBool{Bool: true, Valid: true},
+		},
+		{
+			NameValue:         sql.NullString{String: "dark_mode", Valid: true},
+			DataTypeValue:     sql.NullString{String: "numeric", Valid: true},
+			ColumnTypeValue:   sql.NullString{String: "numeric", Valid: true},
+			NullableValue:     sql.NullBool{Bool: true, Valid: true},
+			DefaultValueValue: sql.NullString{String: "true", Valid: true},
+			UniqueValue:       sql.NullBool{Bool: false, Valid: true},
+			PrimaryKeyValue:   sql.NullBool{Bool: false, Valid: true},
+		},
+	}
+
+	params := []struct {
+		name    string
+		sql     []string
+		nFields int
+		columns []migrator.ColumnType
+	}{
+		{
+			"with_newline",
+			[]string{"CREATE TABLE `users`\n(\nid integer primary key unique,\ndark_mode numeric DEFAULT true)"},
+			2,
+			testColumns,
+		},
+		{
+			"with_newline_2",
+			[]string{"CREATE TABLE `users` (\n\nid integer primary key unique,\ndark_mode numeric DEFAULT true)"},
+			2,
+			testColumns,
+		},
+		{
+			"with_missing_space",
+			[]string{"CREATE TABLE `users`(id integer primary key unique, dark_mode numeric DEFAULT true)"},
+			2,
+			testColumns,
+		},
+		{
+			"with_many_spaces",
+			[]string{"CREATE TABLE `users`       (id    integer   primary key unique,     dark_mode    numeric DEFAULT true)"},
+			2,
+			testColumns,
+		},
+	}
+	for _, p := range params {
+		t.Run(p.name, func(t *testing.T) {
+			ddl, err := parseDDL(p.sql...)
+
+			if err != nil {
+				panic(err.Error())
+			}
+
+			if len(ddl.fields) != p.nFields {
+				t.Fatalf("fields length doesn't match: expect: %v, got %v", p.nFields, len(ddl.fields))
+			}
+			tests.AssertEqual(t, ddl.columns, p.columns)
+		})
+	}
+}
+
+func TestParseDDL_error(t *testing.T) {
+	params := []struct {
+		name string
+		sql  string
+	}{
+		{"invalid_cmd", "CREATE TABLE"},
+		{"unbalanced_brackets", "CREATE TABLE test (ID int NOT NULL,Name varchar(255)"},
+		{"unbalanced_brackets2", "CREATE TABLE test (ID int NOT NULL,Name varchar(255)))"},
+	}
+
+	for _, p := range params {
+		t.Run(p.name, func(t *testing.T) {
+			_, err := parseDDL(p.sql)
+			if err == nil {
+				t.Fail()
+			}
+		})
+	}
+}
+
+func TestAddConstraint(t *testing.T) {
+	params := []struct {
+		name   string
+		fields []string
+		cName  string
+		sql    string
+		expect []string
+	}{
+		{
+			name:   "add_new",
+			fields: []string{"`id` integer NOT NULL"},
+			cName:  "fk_users_notes",
+			sql:    "CONSTRAINT `fk_users_notes` FOREIGN KEY (`user_id`) REFERENCES `users`(`id`))",
+			expect: []string{"`id` integer NOT NULL", "CONSTRAINT `fk_users_notes` FOREIGN KEY (`user_id`) REFERENCES `users`(`id`))"},
+		},
+		{
+			name:   "update",
+			fields: []string{"`id` integer NOT NULL", "CONSTRAINT `fk_users_notes` FOREIGN KEY (`user_id`) REFERENCES `users`(`id`))"},
+			cName:  "fk_users_notes",
+			sql:    "CONSTRAINT `fk_users_notes` FOREIGN KEY (`user_id`) REFERENCES `users`(`id`)) ON UPDATE CASCADE ON DELETE CASCADE",
+			expect: []string{"`id` integer NOT NULL", "CONSTRAINT `fk_users_notes` FOREIGN KEY (`user_id`) REFERENCES `users`(`id`)) ON UPDATE CASCADE ON DELETE CASCADE"},
+		},
+		{
+			name:   "add_check",
+			fields: []string{"`id` integer NOT NULL"},
+			cName:  "name_checker",
+			sql:    "CONSTRAINT `name_checker` CHECK (`name` <> 'jinzhu')",
+			expect: []string{"`id` integer NOT NULL", "CONSTRAINT `name_checker` CHECK (`name` <> 'jinzhu')"},
+		},
+		{
+			name:   "update_check",
+			fields: []string{"`id` integer NOT NULL", "CONSTRAINT `name_checker` CHECK (`name` <> 'thetadev')"},
+			cName:  "name_checker",
+			sql:    "CONSTRAINT `name_checker` CHECK (`name` <> 'jinzhu')",
+			expect: []string{"`id` integer NOT NULL", "CONSTRAINT `name_checker` CHECK (`name` <> 'jinzhu')"},
+		},
+	}
+
+	for _, p := range params {
+		t.Run(p.name, func(t *testing.T) {
+			testDDL := ddl{fields: p.fields}
+
+			testDDL.addConstraint(p.cName, p.sql)
+			tests.AssertEqual(t, p.expect, testDDL.fields)
+		})
+	}
+}
+
+func TestRemoveConstraint(t *testing.T) {
+	params := []struct {
+		name    string
+		fields  []string
+		cName   string
+		success bool
+		expect  []string
+	}{
+		{
+			name:    "fk",
+			fields:  []string{"`id` integer NOT NULL", "CONSTRAINT `fk_users_notes` FOREIGN KEY (`user_id`) REFERENCES `users`(`id`))"},
+			cName:   "fk_users_notes",
+			success: true,
+			expect:  []string{"`id` integer NOT NULL"},
+		},
+		{
+			name:    "check",
+			fields:  []string{"CONSTRAINT `name_checker` CHECK (`name` <> 'thetadev')", "`id` integer NOT NULL"},
+			cName:   "name_checker",
+			success: true,
+			expect:  []string{"`id` integer NOT NULL"},
+		},
+		{
+			name:    "none",
+			fields:  []string{"CONSTRAINT `name_checker` CHECK (`name` <> 'thetadev')", "`id` integer NOT NULL"},
+			cName:   "nothing",
+			success: false,
+			expect:  []string{"CONSTRAINT `name_checker` CHECK (`name` <> 'thetadev')", "`id` integer NOT NULL"},
+		},
+	}
+
+	for _, p := range params {
+		t.Run(p.name, func(t *testing.T) {
+			testDDL := ddl{fields: p.fields}
+
+			success := testDDL.removeConstraint(p.cName)
+
+			tests.AssertEqual(t, p.success, success)
+			tests.AssertEqual(t, p.expect, testDDL.fields)
+		})
+	}
+}
+
+func TestGetColumns(t *testing.T) {
+	params := []struct {
+		name    string
+		ddl     string
+		columns []string
+	}{
+		{
+			name:    "with_fk",
+			ddl:     "CREATE TABLE `notes` (`id` integer NOT NULL,`text` varchar(500),`user_id` integer,PRIMARY KEY (`id`),CONSTRAINT `fk_users_notes` FOREIGN KEY (`user_id`) REFERENCES `users`(`id`))",
+			columns: []string{"`id`", "`text`", "`user_id`"},
+		},
+		{
+			name:    "with_check",
+			ddl:     "CREATE TABLE Persons (ID int NOT NULL,LastName varchar(255) NOT NULL,FirstName varchar(255),Age int,CHECK (Age>=18),CHECK (FirstName!='John'))",
+			columns: []string{"`ID`", "`LastName`", "`FirstName`", "`Age`"},
+		},
+		{
+			name:    "with_escaped_quote",
+			ddl:     "CREATE TABLE Persons (ID int NOT NULL,LastName varchar(255) NOT NULL DEFAULT \"\",FirstName varchar(255))",
+			columns: []string{"`ID`", "`LastName`", "`FirstName`"},
+		},
+		{
+			name:    "with_generated_column",
+			ddl:     "CREATE TABLE Persons (ID int NOT NULL,LastName varchar(255) NOT NULL,FirstName varchar(255),FullName varchar(255) GENERATED ALWAYS AS (FirstName || ' ' || LastName))",
+			columns: []string{"`ID`", "`LastName`", "`FirstName`"},
+		},
+		{
+			name: "with_new_line",
+			ddl: `CREATE TABLE "tb_sys_role_menu__temp" (
+  "id" integer  PRIMARY KEY AUTOINCREMENT,
+  "created_at" datetime NOT NULL,
+  "updated_at" datetime NOT NULL,
+  "created_by" integer NOT NULL DEFAULT 0,
+  "updated_by" integer NOT NULL DEFAULT 0,
+  "role_id" integer NOT NULL,
+  "menu_id" bigint NOT NULL
+)`,
+			columns: []string{"`id`", "`created_at`", "`updated_at`", "`created_by`", "`updated_by`", "`role_id`", "`menu_id`"},
+		},
+	}
+
+	for _, p := range params {
+		t.Run(p.name, func(t *testing.T) {
+			testDDL, err := parseDDL(p.ddl)
+			if err != nil {
+				panic(err.Error())
+			}
+
+			cols := testDDL.getColumns()
+
+			tests.AssertEqual(t, p.columns, cols)
+		})
+	}
+}

gormlite/download.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+cd -P -- "$(dirname -- "$0")"
+
+curl -#OL "https://github.com/go-gorm/sqlite/raw/master/ddlmod.go"
+curl -#OL "https://github.com/go-gorm/sqlite/raw/master/ddlmod_test.go"
+curl -#OL "https://github.com/go-gorm/sqlite/raw/master/error_translator.go"
+curl -#OL "https://github.com/go-gorm/sqlite/raw/master/migrator.go"
+curl -#OL "https://github.com/go-gorm/sqlite/raw/master/sqlite.go"
+curl -#OL "https://github.com/go-gorm/sqlite/raw/master/sqlite_test.go"

gormlite/error_translator.go

@@ -0,0 +1,21 @@
+package gormlite
+
+import (
+	"errors"
+
+	"github.com/ncruces/go-sqlite3"
+	"gorm.io/gorm"
+)
+
+func (_Dialector) Translate(err error) error {
+	switch {
+	case
+		errors.Is(err, sqlite3.CONSTRAINT_UNIQUE),
+		errors.Is(err, sqlite3.CONSTRAINT_PRIMARYKEY):
+		return gorm.ErrDuplicatedKey
+	case
+		errors.Is(err, sqlite3.CONSTRAINT_FOREIGNKEY):
+		return gorm.ErrForeignKeyViolated
+	}
+	return err
+}

gormlite/go.mod

@@ -0,0 +1,16 @@
+module github.com/ncruces/go-sqlite3/gormlite
+
+go 1.21
+
+require (
+	github.com/ncruces/go-sqlite3 v0.10.5
+	gorm.io/gorm v1.25.5
+)
+
+require (
+	github.com/jinzhu/inflection v1.0.0 // indirect
+	github.com/jinzhu/now v1.1.5 // indirect
+	github.com/ncruces/julianday v1.0.0 // indirect
+	github.com/tetratelabs/wazero v1.5.0 // indirect
+	golang.org/x/sys v0.14.0 // indirect
+)

gormlite/go.sum

@@ -0,0 +1,16 @@
+github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
+github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
+github.com/jinzhu/now v1.1.5 h1:/o9tlHleP7gOFmsnYNz3RGnqzefHA47wQpKrrdTIwXQ=
+github.com/jinzhu/now v1.1.5/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
+github.com/ncruces/go-sqlite3 v0.10.5 h1:SPnFFYajDfhTuJNjeNwdOhwVCRSAqB1PdSHsGrdfYjw=
+github.com/ncruces/go-sqlite3 v0.10.5/go.mod h1:8aGu9/G8lLZbvO6TXA0FXTP2liIefFmbpeXuhG4nJLw=
+github.com/ncruces/julianday v1.0.0 h1:fH0OKwa7NWvniGQtxdJRxAgkBMolni2BjDHaWTxqt7M=
+github.com/ncruces/julianday v1.0.0/go.mod h1:Dusn2KvZrrovOMJuOt0TNXL6tB7U2E8kvza5fFc9G7g=
+github.com/tetratelabs/wazero v1.5.0 h1:Yz3fZHivfDiZFUXnWMPUoiW7s8tC1sjdBtlJn08qYa0=
+github.com/tetratelabs/wazero v1.5.0/go.mod h1:0U0G41+ochRKoPKCJlh0jMg1CHkyfK8kDqiirMmKY8A=
+golang.org/x/sys v0.14.0 h1:Vz7Qs629MkJkGyHxUlRHizWJRG2j8fbQKjELVSNhy7Q=
+golang.org/x/sys v0.14.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
+golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
+gorm.io/gorm v1.25.5 h1:zR9lOiiYf09VNh5Q1gphfyia1JpiClIWG9hQaxB/mls=
+gorm.io/gorm v1.25.5/go.mod h1:hbnx/Oo0ChWMn1BIhpy1oYozzpM15i4YPuHDmfYtwg8=

gormlite/migrator.go

@@ -0,0 +1,406 @@
+package gormlite
+
+import (
+	"database/sql"
+	"fmt"
+	"strings"
+
+	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
+	"gorm.io/gorm/migrator"
+	"gorm.io/gorm/schema"
+)
+
+type _Migrator struct {
+	migrator.Migrator
+}
+
+func (m *_Migrator) RunWithoutForeignKey(fc func() error) error {
+	var enabled int
+	m.DB.Raw("PRAGMA foreign_keys").Scan(&enabled)
+	if enabled == 1 {
+		m.DB.Exec("PRAGMA foreign_keys = OFF")
+		defer m.DB.Exec("PRAGMA foreign_keys = ON")
+	}
+
+	return fc()
+}
+
+func (m _Migrator) HasTable(value interface{}) bool {
+	var count int
+	m.Migrator.RunWithValue(value, func(stmt *gorm.Statement) error {
+		return m.DB.Raw("SELECT count(*) FROM sqlite_master WHERE type='table' AND name=?", stmt.Table).Row().Scan(&count)
+	})
+	return count > 0
+}
+
+func (m _Migrator) DropTable(values ...interface{}) error {
+	return m.RunWithoutForeignKey(func() error {
+		values = m.ReorderModels(values, false)
+		tx := m.DB.Session(&gorm.Session{})
+
+		for i := len(values) - 1; i >= 0; i-- {
+			if err := m.RunWithValue(values[i], func(stmt *gorm.Statement) error {
+				return tx.Exec("DROP TABLE IF EXISTS ?", clause.Table{Name: stmt.Table}).Error
+			}); err != nil {
+				return err
+			}
+		}
+
+		return nil
+	})
+}
+
+func (m _Migrator) GetTables() (tableList []string, err error) {
+	return tableList, m.DB.Raw("SELECT name FROM sqlite_master where type=?", "table").Scan(&tableList).Error
+}
+
+func (m _Migrator) HasColumn(value interface{}, name string) bool {
+	var count int
+	m.Migrator.RunWithValue(value, func(stmt *gorm.Statement) error {
+		if stmt.Schema != nil {
+			if field := stmt.Schema.LookUpField(name); field != nil {
+				name = field.DBName
+			}
+		}
+
+		if name != "" {
+			m.DB.Raw(
+				"SELECT count(*) FROM sqlite_master WHERE type = ? AND tbl_name = ? AND (sql LIKE ? OR sql LIKE ? OR sql LIKE ? OR sql LIKE ? OR sql LIKE ?)",
+				"table", stmt.Table, `%"`+name+`" %`, `%`+name+` %`, "%`"+name+"`%", "%["+name+"]%", "%\t"+name+"\t%",
+			).Row().Scan(&count)
+		}
+		return nil
+	})
+	return count > 0
+}
+
+func (m _Migrator) AlterColumn(value interface{}, name string) error {
+	return m.RunWithoutForeignKey(func() error {
+		return m.recreateTable(value, nil, func(ddl *ddl, stmt *gorm.Statement) (*ddl, []interface{}, error) {
+			if field := stmt.Schema.LookUpField(name); field != nil {
+				if ddl.alterColumn(field.DBName, fmt.Sprintf("`%s` ?", field.DBName)) {
+					return nil, nil, fmt.Errorf("field `%s` not found in origin ddl, ddl= '%s'", name, ddl.compile())
+				}
+
+				return ddl, []interface{}{m.FullDataTypeOf(field)}, nil
+			}
+
+			return nil, nil, fmt.Errorf("failed to alter field with name `%s`", name)
+		})
+	})
+}
+
+// ColumnTypes return columnTypes []gorm.ColumnType and execErr error
+func (m _Migrator) ColumnTypes(value interface{}) ([]gorm.ColumnType, error) {
+	columnTypes := make([]gorm.ColumnType, 0)
+	execErr := m.RunWithValue(value, func(stmt *gorm.Statement) (err error) {
+		var (
+			sqls   []string
+			sqlDDL *ddl
+		)
+
+		if err := m.DB.Raw("SELECT sql FROM sqlite_master WHERE type IN ? AND tbl_name = ? AND sql IS NOT NULL order by type = ? desc", []string{"table", "index"}, stmt.Table, "table").Scan(&sqls).Error; err != nil {
+			return err
+		}
+
+		if sqlDDL, err = parseDDL(sqls...); err != nil {
+			return err
+		}
+
+		rows, err := m.DB.Session(&gorm.Session{}).Table(stmt.Table).Limit(1).Rows()
+		if err != nil {
+			return err
+		}
+		defer func() {
+			err = rows.Close()
+		}()
+
+		var rawColumnTypes []*sql.ColumnType
+		rawColumnTypes, err = rows.ColumnTypes()
+		if err != nil {
+			return err
+		}
+
+		for _, c := range rawColumnTypes {
+			columnType := migrator.ColumnType{SQLColumnType: c}
+			for _, column := range sqlDDL.columns {
+				if column.NameValue.String == c.Name() {
+					column.SQLColumnType = c
+					columnType = column
+					break
+				}
+			}
+			columnTypes = append(columnTypes, columnType)
+		}
+
+		return err
+	})
+
+	return columnTypes, execErr
+}
+
+func (m _Migrator) DropColumn(value interface{}, name string) error {
+	return m.recreateTable(value, nil, func(ddl *ddl, stmt *gorm.Statement) (*ddl, []interface{}, error) {
+		if field := stmt.Schema.LookUpField(name); field != nil {
+			name = field.DBName
+		}
+
+		ddl.removeColumn(name)
+		return ddl, nil, nil
+	})
+}
+
+func (m _Migrator) CreateConstraint(value interface{}, name string) error {
+	return m.RunWithValue(value, func(stmt *gorm.Statement) error {
+		constraint, chk, table := m.GuessConstraintAndTable(stmt, name)
+
+		return m.recreateTable(value, &table,
+			func(ddl *ddl, stmt *gorm.Statement) (*ddl, []interface{}, error) {
+				var (
+					constraintName   string
+					constraintSql    string
+					constraintValues []interface{}
+				)
+
+				if constraint != nil {
+					constraintName = constraint.Name
+					constraintSql, constraintValues = buildConstraint(constraint)
+				} else if chk != nil {
+					constraintName = chk.Name
+					constraintSql = "CONSTRAINT ? CHECK (?)"
+					constraintValues = []interface{}{clause.Column{Name: chk.Name}, clause.Expr{SQL: chk.Constraint}}
+				} else {
+					return nil, nil, nil
+				}
+
+				ddl.addConstraint(constraintName, constraintSql)
+				return ddl, constraintValues, nil
+			})
+	})
+}
+
+func (m _Migrator) DropConstraint(value interface{}, name string) error {
+	return m.RunWithValue(value, func(stmt *gorm.Statement) error {
+		constraint, chk, table := m.GuessConstraintAndTable(stmt, name)
+		if constraint != nil {
+			name = constraint.Name
+		} else if chk != nil {
+			name = chk.Name
+		}
+
+		return m.recreateTable(value, &table,
+			func(ddl *ddl, stmt *gorm.Statement) (*ddl, []interface{}, error) {
+				ddl.removeConstraint(name)
+				return ddl, nil, nil
+			})
+	})
+}
+
+func (m _Migrator) HasConstraint(value interface{}, name string) bool {
+	var count int64
+	m.RunWithValue(value, func(stmt *gorm.Statement) error {
+		constraint, chk, table := m.GuessConstraintAndTable(stmt, name)
+		if constraint != nil {
+			name = constraint.Name
+		} else if chk != nil {
+			name = chk.Name
+		}
+
+		m.DB.Raw(
+			"SELECT count(*) FROM sqlite_master WHERE type = ? AND tbl_name = ? AND (sql LIKE ? OR sql LIKE ? OR sql LIKE ? OR sql LIKE ? OR sql LIKE ?)",
+			"table", table, `%CONSTRAINT "`+name+`" %`, `%CONSTRAINT `+name+` %`, "%CONSTRAINT `"+name+"`%", "%CONSTRAINT ["+name+"]%", "%CONSTRAINT \t"+name+"\t%",
+		).Row().Scan(&count)
+
+		return nil
+	})
+
+	return count > 0
+}
+
+func (m _Migrator) CurrentDatabase() (name string) {
+	var null interface{}
+	m.DB.Raw("PRAGMA database_list").Row().Scan(&null, &name, &null)
+	return
+}
+
+func (m _Migrator) BuildIndexOptions(opts []schema.IndexOption, stmt *gorm.Statement) (results []interface{}) {
+	for _, opt := range opts {
+		str := stmt.Quote(opt.DBName)
+		if opt.Expression != "" {
+			str = opt.Expression
+		}
+
+		if opt.Collate != "" {
+			str += " COLLATE " + opt.Collate
+		}
+
+		if opt.Sort != "" {
+			str += " " + opt.Sort
+		}
+		results = append(results, clause.Expr{SQL: str})
+	}
+	return
+}
+
+func (m _Migrator) CreateIndex(value interface{}, name string) error {
+	return m.RunWithValue(value, func(stmt *gorm.Statement) error {
+		if stmt.Schema != nil {
+			if idx := stmt.Schema.LookIndex(name); idx != nil {
+				opts := m.BuildIndexOptions(idx.Fields, stmt)
+				values := []interface{}{clause.Column{Name: idx.Name}, clause.Table{Name: stmt.Table}, opts}
+
+				createIndexSQL := "CREATE "
+				if idx.Class != "" {
+					createIndexSQL += idx.Class + " "
+				}
+				createIndexSQL += "INDEX ?"
+
+				if idx.Type != "" {
+					createIndexSQL += " USING " + idx.Type
+				}
+				createIndexSQL += " ON ??"
+
+				if idx.Where != "" {
+					createIndexSQL += " WHERE " + idx.Where
+				}
+
+				return m.DB.Exec(createIndexSQL, values...).Error
+			}
+		}
+		return fmt.Errorf("failed to create index with name %v", name)
+	})
+}
+
+func (m _Migrator) HasIndex(value interface{}, name string) bool {
+	var count int
+	m.RunWithValue(value, func(stmt *gorm.Statement) error {
+		if stmt.Schema != nil {
+			if idx := stmt.Schema.LookIndex(name); idx != nil {
+				name = idx.Name
+			}
+		}
+
+		if name != "" {
+			m.DB.Raw(
+				"SELECT count(*) FROM sqlite_master WHERE type = ? AND tbl_name = ? AND name = ?", "index", stmt.Table, name,
+			).Row().Scan(&count)
+		}
+		return nil
+	})
+	return count > 0
+}
+
+func (m _Migrator) RenameIndex(value interface{}, oldName, newName string) error {
+	return m.RunWithValue(value, func(stmt *gorm.Statement) error {
+		var sql string
+		m.DB.Raw("SELECT sql FROM sqlite_master WHERE type = ? AND tbl_name = ? AND name = ?", "index", stmt.Table, oldName).Row().Scan(&sql)
+		if sql != "" {
+			if err := m.DropIndex(value, oldName); err != nil {
+				return err
+			}
+			return m.DB.Exec(strings.Replace(sql, oldName, newName, 1)).Error
+		}
+		return fmt.Errorf("failed to find index with name %v", oldName)
+	})
+}
+
+func (m _Migrator) DropIndex(value interface{}, name string) error {
+	return m.RunWithValue(value, func(stmt *gorm.Statement) error {
+		if stmt.Schema != nil {
+			if idx := stmt.Schema.LookIndex(name); idx != nil {
+				name = idx.Name
+			}
+		}
+
+		return m.DB.Exec("DROP INDEX ?", clause.Column{Name: name}).Error
+	})
+}
+
+func buildConstraint(constraint *schema.Constraint) (sql string, results []interface{}) {
+	sql = "CONSTRAINT ? FOREIGN KEY ? REFERENCES ??"
+	if constraint.OnDelete != "" {
+		sql += " ON DELETE " + constraint.OnDelete
+	}
+
+	if constraint.OnUpdate != "" {
+		sql += " ON UPDATE " + constraint.OnUpdate
+	}
+
+	var foreignKeys, references []interface{}
+	for _, field := range constraint.ForeignKeys {
+		foreignKeys = append(foreignKeys, clause.Column{Name: field.DBName})
+	}
+
+	for _, field := range constraint.References {
+		references = append(references, clause.Column{Name: field.DBName})
+	}
+	results = append(results, clause.Table{Name: constraint.Name}, foreignKeys, clause.Table{Name: constraint.ReferenceSchema.Table}, references)
+	return
+}
+
+func (m _Migrator) getRawDDL(table string) (string, error) {
+	var createSQL string
+	m.DB.Raw("SELECT sql FROM sqlite_master WHERE type = ? AND tbl_name = ? AND name = ?", "table", table, table).Row().Scan(&createSQL)
+
+	if m.DB.Error != nil {
+		return "", m.DB.Error
+	}
+	return createSQL, nil
+}
+
+func (m _Migrator) recreateTable(
+	value interface{}, tablePtr *string,
+	getCreateSQL func(ddl *ddl, stmt *gorm.Statement) (sql *ddl, sqlArgs []interface{}, err error),
+) error {
+	return m.RunWithValue(value, func(stmt *gorm.Statement) error {
+		table := stmt.Table
+		if tablePtr != nil {
+			table = *tablePtr
+		}
+
+		rawDDL, err := m.getRawDDL(table)
+		if err != nil {
+			return err
+		}
+
+		originDDL, err := parseDDL(rawDDL)
+		if err != nil {
+			return err
+		}
+
+		createDDL, sqlArgs, err := getCreateSQL(originDDL.clone(), stmt)
+		if err != nil {
+			return err
+		}
+		if createDDL == nil {
+			return nil
+		}
+
+		newTableName := table + "__temp"
+		if err := createDDL.renameTable(newTableName, table); err != nil {
+			return err
+		}
+
+		columns := createDDL.getColumns()
+		createSQL := createDDL.compile()
+
+		return m.DB.Transaction(func(tx *gorm.DB) error {
+			if err := tx.Exec(createSQL, sqlArgs...).Error; err != nil {
+				return err
+			}
+
+			queries := []string{
+				fmt.Sprintf("INSERT INTO `%v`(%v) SELECT %v FROM `%v`", newTableName, strings.Join(columns, ","), strings.Join(columns, ","), table),
+				fmt.Sprintf("DROP TABLE `%v`", table),
+				fmt.Sprintf("ALTER TABLE `%v` RENAME TO `%v`", newTableName, table),
+			}
+			for _, query := range queries {
+				if err := tx.Exec(query).Error; err != nil {
+					return err
+				}
+			}
+			return nil
+		})
+	})
+}

gormlite/sqlite.go

@@ -0,0 +1,260 @@
+// Package gormlite provides a GORM driver for SQLite.
+package gormlite
+
+import (
+	"context"
+	"database/sql"
+	"strconv"
+
+	"gorm.io/gorm"
+	"gorm.io/gorm/callbacks"
+	"gorm.io/gorm/clause"
+	"gorm.io/gorm/logger"
+	"gorm.io/gorm/migrator"
+	"gorm.io/gorm/schema"
+
+	"github.com/ncruces/go-sqlite3"
+	"github.com/ncruces/go-sqlite3/driver"
+)
+
+// Open opens a GORM dialector from a data source name.
+func Open(dsn string) gorm.Dialector {
+	return &_Dialector{DSN: dsn}
+}
+
+// Open opens a GORM dialector from a database handle.
+func OpenDB(db *sql.DB) gorm.Dialector {
+	return &_Dialector{Conn: db}
+}
+
+type _Dialector struct {
+	DSN  string
+	Conn gorm.ConnPool
+}
+
+func (dialector _Dialector) Name() string {
+	return "sqlite"
+}
+
+func (dialector _Dialector) Initialize(db *gorm.DB) (err error) {
+	if dialector.Conn != nil {
+		db.ConnPool = dialector.Conn
+	} else {
+		conn, err := driver.Open(dialector.DSN, func(c *sqlite3.Conn) error {
+			return c.Exec("PRAGMA foreign_keys = ON")
+		})
+		if err != nil {
+			return err
+		}
+		db.ConnPool = conn
+	}
+
+	var version string
+	if err := db.ConnPool.QueryRowContext(context.Background(), "select sqlite_version()").Scan(&version); err != nil {
+		return err
+	}
+	// https://sqlite.org/releaselog/3_35_0.html
+	if compareVersion(version, "3.35.0") >= 0 {
+		callbacks.RegisterDefaultCallbacks(db, &callbacks.Config{
+			CreateClauses:        []string{"INSERT", "VALUES", "ON CONFLICT", "RETURNING"},
+			UpdateClauses:        []string{"UPDATE", "SET", "FROM", "WHERE", "RETURNING"},
+			DeleteClauses:        []string{"DELETE", "FROM", "WHERE", "RETURNING"},
+			LastInsertIDReversed: true,
+		})
+	} else {
+		callbacks.RegisterDefaultCallbacks(db, &callbacks.Config{
+			LastInsertIDReversed: true,
+		})
+	}
+
+	for k, v := range dialector.ClauseBuilders() {
+		db.ClauseBuilders[k] = v
+	}
+	return
+}
+
+func (dialector _Dialector) ClauseBuilders() map[string]clause.ClauseBuilder {
+	return map[string]clause.ClauseBuilder{
+		"INSERT": func(c clause.Clause, builder clause.Builder) {
+			if insert, ok := c.Expression.(clause.Insert); ok {
+				if stmt, ok := builder.(*gorm.Statement); ok {
+					stmt.WriteString("INSERT ")
+					if insert.Modifier != "" {
+						stmt.WriteString(insert.Modifier)
+						stmt.WriteByte(' ')
+					}
+
+					stmt.WriteString("INTO ")
+					if insert.Table.Name == "" {
+						stmt.WriteQuoted(stmt.Table)
+					} else {
+						stmt.WriteQuoted(insert.Table)
+					}
+					return
+				}
+			}
+
+			c.Build(builder)
+		},
+		"LIMIT": func(c clause.Clause, builder clause.Builder) {
+			if limit, ok := c.Expression.(clause.Limit); ok {
+				var lmt = -1
+				if limit.Limit != nil && *limit.Limit >= 0 {
+					lmt = *limit.Limit
+				}
+				if lmt >= 0 || limit.Offset > 0 {
+					builder.WriteString("LIMIT ")
+					builder.WriteString(strconv.Itoa(lmt))
+				}
+				if limit.Offset > 0 {
+					builder.WriteString(" OFFSET ")
+					builder.WriteString(strconv.Itoa(limit.Offset))
+				}
+			}
+		},
+		"FOR": func(c clause.Clause, builder clause.Builder) {
+			if _, ok := c.Expression.(clause.Locking); ok {
+				// SQLite3 does not support row-level locking.
+				return
+			}
+			c.Build(builder)
+		},
+	}
+}
+
+func (dialector _Dialector) DefaultValueOf(field *schema.Field) clause.Expression {
+	if field.AutoIncrement {
+		return clause.Expr{SQL: "NULL"}
+	}
+
+	// doesn't work, will raise error
+	return clause.Expr{SQL: "DEFAULT"}
+}
+
+func (dialector _Dialector) Migrator(db *gorm.DB) gorm.Migrator {
+	return _Migrator{migrator.Migrator{Config: migrator.Config{
+		DB:                          db,
+		Dialector:                   dialector,
+		CreateIndexAfterCreateTable: true,
+	}}}
+}
+
+func (dialector _Dialector) BindVarTo(writer clause.Writer, stmt *gorm.Statement, v interface{}) {
+	writer.WriteByte('?')
+}
+
+func (dialector _Dialector) QuoteTo(writer clause.Writer, str string) {
+	var (
+		underQuoted, selfQuoted bool
+		continuousBacktick      int8
+		shiftDelimiter          int8
+	)
+
+	for _, v := range []byte(str) {
+		switch v {
+		case '`':
+			continuousBacktick++
+			if continuousBacktick == 2 {
+				writer.WriteString("``")
+				continuousBacktick = 0
+			}
+		case '.':
+			if continuousBacktick > 0 || !selfQuoted {
+				shiftDelimiter = 0
+				underQuoted = false
+				continuousBacktick = 0
+				writer.WriteString("`")
+			}
+			writer.WriteByte(v)
+			continue
+		default:
+			if shiftDelimiter-continuousBacktick <= 0 && !underQuoted {
+				writer.WriteString("`")
+				underQuoted = true
+				if selfQuoted = continuousBacktick > 0; selfQuoted {
+					continuousBacktick -= 1
+				}
+			}
+
+			for ; continuousBacktick > 0; continuousBacktick -= 1 {
+				writer.WriteString("``")
+			}
+
+			writer.WriteByte(v)
+		}
+		shiftDelimiter++
+	}
+
+	if continuousBacktick > 0 && !selfQuoted {
+		writer.WriteString("``")
+	}
+	writer.WriteString("`")
+}
+
+func (dialector _Dialector) Explain(sql string, vars ...interface{}) string {
+	return logger.ExplainSQL(sql, nil, `"`, vars...)
+}
+
+func (dialector _Dialector) DataTypeOf(field *schema.Field) string {
+	switch field.DataType {
+	case schema.Bool:
+		return "numeric"
+	case schema.Int, schema.Uint:
+		if field.AutoIncrement {
+			// doesn't check `PrimaryKey`, to keep backward compatibility
+			// https://sqlite.org/autoinc.html
+			return "integer PRIMARY KEY AUTOINCREMENT"
+		} else {
+			return "integer"
+		}
+	case schema.Float:
+		return "real"
+	case schema.String:
+		return "text"
+	case schema.Time:
+		// Distinguish between schema.Time and tag time
+		if val, ok := field.TagSettings["TYPE"]; ok {
+			return val
+		} else {
+			return "datetime"
+		}
+	case schema.Bytes:
+		return "blob"
+	}
+
+	return string(field.DataType)
+}
+
+func (dialectopr _Dialector) SavePoint(tx *gorm.DB, name string) error {
+	tx.Exec("SAVEPOINT " + name)
+	return nil
+}
+
+func (dialectopr _Dialector) RollbackTo(tx *gorm.DB, name string) error {
+	tx.Exec("ROLLBACK TO SAVEPOINT " + name)
+	return nil
+}
+
+func compareVersion(version1, version2 string) int {
+	n, m := len(version1), len(version2)
+	i, j := 0, 0
+	for i < n || j < m {
+		x := 0
+		for ; i < n && version1[i] != '.'; i++ {
+			x = x*10 + int(version1[i]-'0')
+		}
+		i++
+		y := 0
+		for ; j < m && version2[j] != '.'; j++ {
+			y = y*10 + int(version2[j]-'0')
+		}
+		j++
+		if x > y {
+			return 1
+		}
+		if x < y {
+			return -1
+		}
+	}
+	return 0
+}

gormlite/sqlite_test.go

@@ -0,0 +1,96 @@
+package gormlite
+
+import (
+	"fmt"
+	"testing"
+
+	"gorm.io/gorm"
+
+	"github.com/ncruces/go-sqlite3"
+	"github.com/ncruces/go-sqlite3/driver"
+	_ "github.com/ncruces/go-sqlite3/embed"
+)
+
+func TestDialector(t *testing.T) {
+	// This is the DSN of the in-memory SQLite database for these tests.
+	const InMemoryDSN = "file:testdatabase?mode=memory&cache=shared"
+
+	// Custom connection with a custom function called "my_custom_function".
+	db, err := driver.Open(InMemoryDSN, func(conn *sqlite3.Conn) error {
+		return conn.CreateFunction("my_custom_function", 0, sqlite3.DETERMINISTIC,
+			func(ctx sqlite3.Context, arg ...sqlite3.Value) {
+				ctx.ResultText("my-result")
+			})
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	rows := []struct {
+		description  string
+		dialector    gorm.Dialector
+		openSuccess  bool
+		query        string
+		querySuccess bool
+	}{
+		{
+			description:  "Default driver",
+			dialector:    Open(InMemoryDSN),
+			openSuccess:  true,
+			query:        "SELECT 1",
+			querySuccess: true,
+		},
+		{
+			description:  "Custom function",
+			dialector:    Open(InMemoryDSN),
+			openSuccess:  true,
+			query:        "SELECT my_custom_function()",
+			querySuccess: false,
+		},
+		{
+			description:  "Custom connection",
+			dialector:    OpenDB(db),
+			openSuccess:  true,
+			query:        "SELECT 1",
+			querySuccess: true,
+		},
+		{
+			description:  "Custom connection, custom function",
+			dialector:    OpenDB(db),
+			openSuccess:  true,
+			query:        "SELECT my_custom_function()",
+			querySuccess: true,
+		},
+	}
+	for rowIndex, row := range rows {
+		t.Run(fmt.Sprintf("%d/%s", rowIndex, row.description), func(t *testing.T) {
+			db, err := gorm.Open(row.dialector, &gorm.Config{})
+			if !row.openSuccess {
+				if err == nil {
+					t.Errorf("Expected Open to fail.")
+				}
+				return
+			}
+
+			if err != nil {
+				t.Errorf("Expected Open to succeed; got error: %v", err)
+			}
+			if db == nil {
+				t.Errorf("Expected db to be non-nil.")
+			}
+			if row.query != "" {
+				err = db.Exec(row.query).Error
+				if !row.querySuccess {
+					if err == nil {
+						t.Errorf("Expected query to fail.")
+					}
+					return
+				}
+
+				if err != nil {
+					t.Errorf("Expected query to succeed; got error: %v", err)
+				}
+			}
+		})
+	}
+}

gormlite/test.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+cd -P -- "$(dirname -- "$0")"
+
+rm -rf gorm/ tests/
+git clone --filter=blob:none https://github.com/go-gorm/gorm.git
+mv gorm/tests tests
+rm -rf gorm/
+
+patch -p1 -N < tests.patch
+
+cd tests
+go mod edit \
+ -require github.com/ncruces/go-sqlite3/gormlite@v0.0.0 \
+ -replace github.com/ncruces/go-sqlite3/gormlite=../ \
+ -replace github.com/ncruces/go-sqlite3=../../ \
+ -droprequire gorm.io/driver/sqlite \
+ -dropreplace gorm.io/gorm
+go mod tidy && go work use . && go test
+
+cd ..
+rm -rf tests/
+go work use -r .

gormlite/tests.patch

@@ -0,0 +1,22 @@
+diff --git a/tests/.gitignore b/tests/.gitignore
+--- a/tests/.gitignore
++++ b/tests/.gitignore
+@@ -1 +1 @@
+-go.sum
++*
+diff --git a/tests/tests_test.go b/tests/tests_test.go
+--- a/tests/tests_test.go
++++ b/tests/tests_test.go
+@@ -7,9 +7,11 @@ import (
+ 	"path/filepath"
+ 	"time"
+ 
++	_ "github.com/ncruces/go-sqlite3/embed"
++	sqlite "github.com/ncruces/go-sqlite3/gormlite"
++
+ 	"gorm.io/driver/mysql"
+ 	"gorm.io/driver/postgres"
+-	"gorm.io/driver/sqlite"
+ 	"gorm.io/driver/sqlserver"
+ 	"gorm.io/gorm"
+ 	"gorm.io/gorm/logger"

internal/util/const.go

@@ -72,6 +72,7 @@ const (
 	IOERR_ROLLBACK_ATOMIC   = IOERR | (31 << 8)
 	IOERR_DATA              = IOERR | (32 << 8)
 	IOERR_CORRUPTFS         = IOERR | (33 << 8)
+	IOERR_IN_PAGE           = IOERR | (34 << 8)
 	LOCKED_SHAREDCACHE      = LOCKED | (1 << 8)
 	LOCKED_VTAB             = LOCKED | (2 << 8)
 	BUSY_RECOVERY           = BUSY | (1 << 8)

internal/util/error.go

@@ -23,6 +23,7 @@ const (
 	OffsetErr    = ErrorString("sqlite3: invalid offset")
 	TailErr      = ErrorString("sqlite3: multiple statements")
 	IsolationErr = ErrorString("sqlite3: unsupported isolation level")
+	ValueErr     = ErrorString("sqlite3: unsupported value")
 	NoVFSErr     = ErrorString("sqlite3: no such vfs: ")
 )
 

internal/util/func.go

@@ -10,6 +10,32 @@ import (
 type i32 interface{ ~int32 | ~uint32 }
 type i64 interface{ ~int64 | ~uint64 }
 
+type funcVI[T0 i32] func(context.Context, api.Module, T0)
+
+func (fn funcVI[T0]) Call(ctx context.Context, mod api.Module, stack []uint64) {
+	fn(ctx, mod, T0(stack[0]))
+}
+
+func ExportFuncVI[T0 i32](mod wazero.HostModuleBuilder, name string, fn func(context.Context, api.Module, T0)) {
+	mod.NewFunctionBuilder().
+		WithGoModuleFunction(funcVI[T0](fn),
+			[]api.ValueType{api.ValueTypeI32}, nil).
+		Export(name)
+}
+
+type funcVIII[T0, T1, T2 i32] func(context.Context, api.Module, T0, T1, T2)
+
+func (fn funcVIII[T0, T1, T2]) Call(ctx context.Context, mod api.Module, stack []uint64) {
+	fn(ctx, mod, T0(stack[0]), T1(stack[1]), T2(stack[2]))
+}
+
+func ExportFuncVIII[T0, T1, T2 i32](mod wazero.HostModuleBuilder, name string, fn func(context.Context, api.Module, T0, T1, T2)) {
+	mod.NewFunctionBuilder().
+		WithGoModuleFunction(funcVIII[T0, T1, T2](fn),
+			[]api.ValueType{api.ValueTypeI32, api.ValueTypeI32, api.ValueTypeI32}, nil).
+		Export(name)
+}
+
 type funcII[TR, T0 i32] func(context.Context, api.Module, T0) TR
 
 func (fn funcII[TR, T0]) Call(ctx context.Context, mod api.Module, stack []uint64) {

internal/util/handle.go

@@ -0,0 +1,75 @@
+package util
+
+import (
+	"context"
+	"io"
+
+	"github.com/tetratelabs/wazero/experimental"
+)
+
+type handleKey struct{}
+type handleState struct {
+	handles []any
+	empty   int
+}
+
+func NewContext(ctx context.Context) context.Context {
+	state := new(handleState)
+	ctx = experimental.WithCloseNotifier(ctx, state)
+	ctx = context.WithValue(ctx, handleKey{}, state)
+	return ctx
+}
+
+func (s *handleState) CloseNotify(ctx context.Context, exitCode uint32) {
+	for _, h := range s.handles {
+		if c, ok := h.(io.Closer); ok {
+			c.Close()
+		}
+	}
+	s.handles = nil
+	s.empty = 0
+}
+
+func GetHandle(ctx context.Context, id uint32) any {
+	if id == 0 {
+		return nil
+	}
+	s := ctx.Value(handleKey{}).(*handleState)
+	return s.handles[^id]
+}
+
+func DelHandle(ctx context.Context, id uint32) error {
+	if id == 0 {
+		return nil
+	}
+	s := ctx.Value(handleKey{}).(*handleState)
+	a := s.handles[^id]
+	s.handles[^id] = nil
+	s.empty++
+	if c, ok := a.(io.Closer); ok {
+		return c.Close()
+	}
+	return nil
+}
+
+func AddHandle(ctx context.Context, a any) (id uint32) {
+	if a == nil {
+		panic(NilErr)
+	}
+	s := ctx.Value(handleKey{}).(*handleState)
+
+	// Find an empty slot.
+	if s.empty > cap(s.handles)-len(s.handles) {
+		for id, h := range s.handles {
+			if h == nil {
+				s.empty--
+				s.handles[id] = a
+				return ^uint32(id)
+			}
+		}
+	}
+
+	// Add a new slot.
+	s.handles = append(s.handles, a)
+	return -uint32(len(s.handles))
+}

internal/util/mem.go

@@ -14,6 +14,9 @@ func View(mod api.Module, ptr uint32, size uint64) []byte {
 	if size > math.MaxUint32 {
 		panic(RangeErr)
 	}
+	if size == 0 {
+		return nil
+	}
 	buf, ok := mod.Memory().Read(ptr, uint32(size))
 	if !ok {
 		panic(RangeErr)
@@ -21,6 +24,17 @@ func View(mod api.Module, ptr uint32, size uint64) []byte {
 	return buf
 }
 
+func ReadUint8(mod api.Module, ptr uint32) uint8 {
+	if ptr == 0 {
+		panic(NilErr)
+	}
+	v, ok := mod.Memory().ReadByte(ptr)
+	if !ok {
+		panic(RangeErr)
+	}
+	return v
+}
+
 func ReadUint32(mod api.Module, ptr uint32) uint32 {
 	if ptr == 0 {
 		panic(NilErr)
@@ -32,6 +46,16 @@ func ReadUint32(mod api.Module, ptr uint32) uint32 {
 	return v
 }
 
+func WriteUint8(mod api.Module, ptr uint32, v uint8) {
+	if ptr == 0 {
+		panic(NilErr)
+	}
+	ok := mod.Memory().WriteByte(ptr, v)
+	if !ok {
+		panic(RangeErr)
+	}
+}
+
 func WriteUint32(mod api.Module, ptr uint32, v uint32) {
 	if ptr == 0 {
 		panic(NilErr)

internal/util/mem_test.go

@@ -28,6 +28,20 @@ func TestView_overflow(t *testing.T) {
 	t.Error("want panic")
 }
 
+func TestReadUint8_nil(t *testing.T) {
+	defer func() { _ = recover() }()
+	mock := wazerotest.NewModule(wazerotest.NewFixedMemory(wazerotest.PageSize))
+	ReadUint8(mock, 0)
+	t.Error("want panic")
+}
+
+func TestReadUint8_range(t *testing.T) {
+	defer func() { _ = recover() }()
+	mock := wazerotest.NewModule(wazerotest.NewFixedMemory(wazerotest.PageSize))
+	ReadUint8(mock, wazerotest.PageSize)
+	t.Error("want panic")
+}
+
 func TestReadUint32_nil(t *testing.T) {
 	defer func() { _ = recover() }()
 	mock := wazerotest.NewModule(wazerotest.NewFixedMemory(wazerotest.PageSize))
@@ -56,6 +70,20 @@ func TestReadUint64_range(t *testing.T) {
 	t.Error("want panic")
 }
 
+func TestWriteUint8_nil(t *testing.T) {
+	defer func() { _ = recover() }()
+	mock := wazerotest.NewModule(wazerotest.NewFixedMemory(wazerotest.PageSize))
+	WriteUint8(mock, 0, 1)
+	t.Error("want panic")
+}
+
+func TestWriteUint8_range(t *testing.T) {
+	defer func() { _ = recover() }()
+	mock := wazerotest.NewModule(wazerotest.NewFixedMemory(wazerotest.PageSize))
+	WriteUint8(mock, wazerotest.PageSize, 1)
+	t.Error("want panic")
+}
+
 func TestWriteUint32_nil(t *testing.T) {
 	defer func() { _ = recover() }()
 	mock := wazerotest.NewModule(wazerotest.NewFixedMemory(wazerotest.PageSize))

json.go

@@ -0,0 +1,46 @@
+package sqlite3
+
+import (
+	"encoding/json"
+	"strconv"
+	"time"
+	"unsafe"
+
+	"github.com/ncruces/go-sqlite3/internal/util"
+)
+
+// JSON returns a value that can be used as an argument to
+// [database/sql.DB.Exec], [database/sql.Row.Scan] and similar methods to
+// store value as JSON, or decode JSON into value.
+func JSON(value any) any {
+	return jsonValue{value}
+}
+
+type jsonValue struct{ any }
+
+func (j jsonValue) JSON() any { return j.any }
+
+func (j jsonValue) Scan(value any) error {
+	var buf []byte
+
+	switch v := value.(type) {
+	case []byte:
+		buf = v
+	case string:
+		buf = unsafe.Slice(unsafe.StringData(v), len(v))
+	case int64:
+		buf = strconv.AppendInt(nil, v, 10)
+	case float64:
+		buf = strconv.AppendFloat(nil, v, 'g', -1, 64)
+	case time.Time:
+		buf = append(buf, '"')
+		buf = v.AppendFormat(buf, time.RFC3339Nano)
+		buf = append(buf, '"')
+	case nil:
+		buf = append(buf, "null"...)
+	default:
+		panic(util.AssertErr())
+	}
+
+	return json.Unmarshal(buf, j.any)
+}

module.go

@@ -1,352 +0,0 @@
-// Package sqlite3 wraps the C SQLite API.
-package sqlite3
-
-import (
-	"context"
-	"io"
-	"math"
-	"os"
-	"sync"
-
-	"github.com/ncruces/go-sqlite3/internal/util"
-	"github.com/ncruces/go-sqlite3/vfs"
-	"github.com/tetratelabs/wazero"
-	"github.com/tetratelabs/wazero/api"
-)
-
-// Configure SQLite WASM.
-//
-// Importing package embed initializes these
-// with an appropriate build of SQLite:
-//
-//	import _ "github.com/ncruces/go-sqlite3/embed"
-var (
-	Binary []byte // WASM binary to load.
-	Path   string // Path to load the binary from.
-)
-
-var sqlite3 struct {
-	runtime  wazero.Runtime
-	compiled wazero.CompiledModule
-	err      error
-	once     sync.Once
-}
-
-func instantiateModule() (*module, error) {
-	ctx := context.Background()
-
-	sqlite3.once.Do(compileModule)
-	if sqlite3.err != nil {
-		return nil, sqlite3.err
-	}
-
-	cfg := wazero.NewModuleConfig()
-
-	mod, err := sqlite3.runtime.InstantiateModule(ctx, sqlite3.compiled, cfg)
-	if err != nil {
-		return nil, err
-	}
-	return newModule(mod)
-}
-
-func compileModule() {
-	ctx := context.Background()
-	sqlite3.runtime = wazero.NewRuntime(ctx)
-
-	env := vfs.ExportHostFunctions(sqlite3.runtime.NewHostModuleBuilder("env"))
-	_, sqlite3.err = env.Instantiate(ctx)
-	if sqlite3.err != nil {
-		return
-	}
-
-	bin := Binary
-	if bin == nil && Path != "" {
-		bin, sqlite3.err = os.ReadFile(Path)
-		if sqlite3.err != nil {
-			return
-		}
-	}
-	if bin == nil {
-		sqlite3.err = util.BinaryErr
-		return
-	}
-
-	sqlite3.compiled, sqlite3.err = sqlite3.runtime.CompileModule(ctx, bin)
-}
-
-type module struct {
-	ctx context.Context
-	mod api.Module
-	vfs io.Closer
-	api sqliteAPI
-	arg [8]uint64
-}
-
-func newModule(mod api.Module) (m *module, err error) {
-	m = new(module)
-	m.mod = mod
-	m.ctx, m.vfs = vfs.NewContext(context.Background())
-
-	getFun := func(name string) api.Function {
-		f := mod.ExportedFunction(name)
-		if f == nil {
-			err = util.NoFuncErr + util.ErrorString(name)
-			return nil
-		}
-		return f
-	}
-
-	getVal := func(name string) uint32 {
-		g := mod.ExportedGlobal(name)
-		if g == nil {
-			err = util.NoGlobalErr + util.ErrorString(name)
-			return 0
-		}
-		return util.ReadUint32(mod, uint32(g.Get()))
-	}
-
-	m.api = sqliteAPI{
-		free:            getFun("free"),
-		malloc:          getFun("malloc"),
-		destructor:      getVal("malloc_destructor"),
-		errcode:         getFun("sqlite3_errcode"),
-		errstr:          getFun("sqlite3_errstr"),
-		errmsg:          getFun("sqlite3_errmsg"),
-		erroff:          getFun("sqlite3_error_offset"),
-		open:            getFun("sqlite3_open_v2"),
-		close:           getFun("sqlite3_close"),
-		closeZombie:     getFun("sqlite3_close_v2"),
-		prepare:         getFun("sqlite3_prepare_v3"),
-		finalize:        getFun("sqlite3_finalize"),
-		reset:           getFun("sqlite3_reset"),
-		step:            getFun("sqlite3_step"),
-		exec:            getFun("sqlite3_exec"),
-		clearBindings:   getFun("sqlite3_clear_bindings"),
-		bindCount:       getFun("sqlite3_bind_parameter_count"),
-		bindIndex:       getFun("sqlite3_bind_parameter_index"),
-		bindName:        getFun("sqlite3_bind_parameter_name"),
-		bindNull:        getFun("sqlite3_bind_null"),
-		bindInteger:     getFun("sqlite3_bind_int64"),
-		bindFloat:       getFun("sqlite3_bind_double"),
-		bindText:        getFun("sqlite3_bind_text64"),
-		bindBlob:        getFun("sqlite3_bind_blob64"),
-		bindZeroBlob:    getFun("sqlite3_bind_zeroblob64"),
-		columnCount:     getFun("sqlite3_column_count"),
-		columnName:      getFun("sqlite3_column_name"),
-		columnType:      getFun("sqlite3_column_type"),
-		columnInteger:   getFun("sqlite3_column_int64"),
-		columnFloat:     getFun("sqlite3_column_double"),
-		columnText:      getFun("sqlite3_column_text"),
-		columnBlob:      getFun("sqlite3_column_blob"),
-		columnBytes:     getFun("sqlite3_column_bytes"),
-		blobOpen:        getFun("sqlite3_blob_open"),
-		blobClose:       getFun("sqlite3_blob_close"),
-		blobReopen:      getFun("sqlite3_blob_reopen"),
-		blobBytes:       getFun("sqlite3_blob_bytes"),
-		blobRead:        getFun("sqlite3_blob_read"),
-		blobWrite:       getFun("sqlite3_blob_write"),
-		backupInit:      getFun("sqlite3_backup_init"),
-		backupStep:      getFun("sqlite3_backup_step"),
-		backupFinish:    getFun("sqlite3_backup_finish"),
-		backupRemaining: getFun("sqlite3_backup_remaining"),
-		backupPageCount: getFun("sqlite3_backup_pagecount"),
-		changes:         getFun("sqlite3_changes64"),
-		lastRowid:       getFun("sqlite3_last_insert_rowid"),
-		autocommit:      getFun("sqlite3_get_autocommit"),
-	}
-	if err != nil {
-		return nil, err
-	}
-	return m, nil
-}
-
-func (m *module) close() error {
-	err := m.mod.Close(m.ctx)
-	m.vfs.Close()
-	return err
-}
-
-func (m *module) error(rc uint64, handle uint32, sql ...string) error {
-	if rc == _OK {
-		return nil
-	}
-
-	err := Error{code: rc}
-
-	if err.Code() == NOMEM || err.ExtendedCode() == IOERR_NOMEM {
-		panic(util.OOMErr)
-	}
-
-	if r := m.call(m.api.errstr, rc); r != 0 {
-		err.str = util.ReadString(m.mod, uint32(r), _MAX_STRING)
-	}
-
-	if r := m.call(m.api.errmsg, uint64(handle)); r != 0 {
-		err.msg = util.ReadString(m.mod, uint32(r), _MAX_STRING)
-	}
-
-	if sql != nil {
-		if r := m.call(m.api.erroff, uint64(handle)); r != math.MaxUint32 {
-			err.sql = sql[0][r:]
-		}
-	}
-
-	switch err.msg {
-	case err.str, "not an error":
-		err.msg = ""
-	}
-	return &err
-}
-
-func (m *module) call(fn api.Function, params ...uint64) uint64 {
-	copy(m.arg[:], params)
-	err := fn.CallWithStack(m.ctx, m.arg[:])
-	if err != nil {
-		// The module closed or panicked; release resources.
-		m.vfs.Close()
-		panic(err)
-	}
-	return m.arg[0]
-}
-
-func (m *module) free(ptr uint32) {
-	if ptr == 0 {
-		return
-	}
-	m.call(m.api.free, uint64(ptr))
-}
-
-func (m *module) new(size uint64) uint32 {
-	if size > _MAX_ALLOCATION_SIZE {
-		panic(util.OOMErr)
-	}
-	ptr := uint32(m.call(m.api.malloc, size))
-	if ptr == 0 && size != 0 {
-		panic(util.OOMErr)
-	}
-	return ptr
-}
-
-func (m *module) newBytes(b []byte) uint32 {
-	if b == nil {
-		return 0
-	}
-	ptr := m.new(uint64(len(b)))
-	util.WriteBytes(m.mod, ptr, b)
-	return ptr
-}
-
-func (m *module) newString(s string) uint32 {
-	ptr := m.new(uint64(len(s) + 1))
-	util.WriteString(m.mod, ptr, s)
-	return ptr
-}
-
-func (m *module) newArena(size uint64) arena {
-	return arena{
-		m:    m,
-		base: m.new(size),
-		size: uint32(size),
-	}
-}
-
-type arena struct {
-	m    *module
-	ptrs []uint32
-	base uint32
-	next uint32
-	size uint32
-}
-
-func (a *arena) free() {
-	if a.m == nil {
-		return
-	}
-	a.reset()
-	a.m.free(a.base)
-	a.m = nil
-}
-
-func (a *arena) reset() {
-	for _, ptr := range a.ptrs {
-		a.m.free(ptr)
-	}
-	a.ptrs = nil
-	a.next = 0
-}
-
-func (a *arena) new(size uint64) uint32 {
-	if size <= uint64(a.size-a.next) {
-		ptr := a.base + a.next
-		a.next += uint32(size)
-		return ptr
-	}
-	ptr := a.m.new(size)
-	a.ptrs = append(a.ptrs, ptr)
-	return ptr
-}
-
-func (a *arena) bytes(b []byte) uint32 {
-	if b == nil {
-		return 0
-	}
-	ptr := a.new(uint64(len(b)))
-	util.WriteBytes(a.m.mod, ptr, b)
-	return ptr
-}
-
-func (a *arena) string(s string) uint32 {
-	ptr := a.new(uint64(len(s) + 1))
-	util.WriteString(a.m.mod, ptr, s)
-	return ptr
-}
-
-type sqliteAPI struct {
-	free            api.Function
-	malloc          api.Function
-	errcode         api.Function
-	errstr          api.Function
-	errmsg          api.Function
-	erroff          api.Function
-	open            api.Function
-	close           api.Function
-	closeZombie     api.Function
-	prepare         api.Function
-	finalize        api.Function
-	reset           api.Function
-	step            api.Function
-	exec            api.Function
-	clearBindings   api.Function
-	bindNull        api.Function
-	bindCount       api.Function
-	bindIndex       api.Function
-	bindName        api.Function
-	bindInteger     api.Function
-	bindFloat       api.Function
-	bindText        api.Function
-	bindBlob        api.Function
-	bindZeroBlob    api.Function
-	columnCount     api.Function
-	columnName      api.Function
-	columnType      api.Function
-	columnInteger   api.Function
-	columnFloat     api.Function
-	columnText      api.Function
-	columnBlob      api.Function
-	columnBytes     api.Function
-	blobOpen        api.Function
-	blobClose       api.Function
-	blobReopen      api.Function
-	blobBytes       api.Function
-	blobRead        api.Function
-	blobWrite       api.Function
-	backupInit      api.Function
-	backupStep      api.Function
-	backupFinish    api.Function
-	backupRemaining api.Function
-	backupPageCount api.Function
-	changes         api.Function
-	lastRowid       api.Function
-	autocommit      api.Function
-	destructor      uint32
-}

pointer.go

@@ -0,0 +1,14 @@
+package sqlite3
+
+// Pointer returns a pointer to a value
+// that can be used as an argument to
+// [database/sql.DB.Exec] and similar methods.
+//
+// https://sqlite.org/bindptr.html
+func Pointer[T any](val T) any {
+	return pointer[T]{val}
+}
+
+type pointer[T any] struct{ val T }
+
+func (p pointer[T]) Pointer() any { return p.val }

quote.go

@@ -0,0 +1,112 @@
+package sqlite3
+
+import (
+	"bytes"
+	"math"
+	"strconv"
+	"strings"
+	"time"
+	"unsafe"
+
+	"github.com/ncruces/go-sqlite3/internal/util"
+)
+
+// Quote escapes and quotes a value
+// making it safe to embed in SQL text.
+func Quote(value any) string {
+	switch v := value.(type) {
+	case nil:
+		return "NULL"
+	case bool:
+		if v {
+			return "1"
+		} else {
+			return "0"
+		}
+
+	case int:
+		return strconv.Itoa(v)
+	case int64:
+		return strconv.FormatInt(v, 10)
+	case float64:
+		switch {
+		case math.IsNaN(v):
+			return "NULL"
+		case math.IsInf(v, 1):
+			return "9.0e999"
+		case math.IsInf(v, -1):
+			return "-9.0e999"
+		}
+		return strconv.FormatFloat(v, 'g', -1, 64)
+	case time.Time:
+		return "'" + v.Format(time.RFC3339Nano) + "'"
+
+	case string:
+		if strings.IndexByte(v, 0) >= 0 {
+			break
+		}
+
+		buf := make([]byte, 2+len(v)+strings.Count(v, "'"))
+		buf[0] = '\''
+		i := 1
+		for _, b := range []byte(v) {
+			if b == '\'' {
+				buf[i] = b
+				i += 1
+			}
+			buf[i] = b
+			i += 1
+		}
+		buf[i] = '\''
+		return unsafe.String(&buf[0], len(buf))
+
+	case []byte:
+		buf := make([]byte, 3+2*len(v))
+		buf[0] = 'x'
+		buf[1] = '\''
+		i := 2
+		for _, b := range v {
+			const hex = "0123456789ABCDEF"
+			buf[i+0] = hex[b/16]
+			buf[i+1] = hex[b%16]
+			i += 2
+		}
+		buf[i] = '\''
+		return unsafe.String(&buf[0], len(buf))
+
+	case ZeroBlob:
+		if v > ZeroBlob(1e9-3)/2 {
+			break
+		}
+
+		buf := bytes.Repeat([]byte("0"), int(3+2*int64(v)))
+		buf[0] = 'x'
+		buf[1] = '\''
+		buf[len(buf)-1] = '\''
+		return unsafe.String(&buf[0], len(buf))
+	}
+
+	panic(util.ValueErr)
+}
+
+// QuoteIdentifier escapes and quotes an identifier
+// making it safe to embed in SQL text.
+func QuoteIdentifier(id string) string {
+	if strings.IndexByte(id, 0) >= 0 {
+		panic(util.ValueErr)
+	}
+
+	buf := make([]byte, 2+len(id)+strings.Count(id, `"`))
+	buf[0] = '"'
+	i := 1
+	for _, b := range []byte(id) {
+		if b == '"' {
+			buf[i] = b
+			i += 1
+		}
+		buf[i] = b
+		i += 1
+	}
+	buf[i] = '"'
+	return unsafe.String(&buf[0], len(buf))
+}

sqlite.go

@@ -0,0 +1,454 @@
+// Package sqlite3 wraps the C SQLite API.
+package sqlite3
+
+import (
+	"context"
+	"math"
+	"os"
+	"sync"
+
+	"github.com/ncruces/go-sqlite3/internal/util"
+	"github.com/ncruces/go-sqlite3/vfs"
+	"github.com/tetratelabs/wazero"
+	"github.com/tetratelabs/wazero/api"
+)
+
+// Configure SQLite WASM.
+//
+// Importing package embed initializes these
+// with an appropriate build of SQLite:
+//
+//	import _ "github.com/ncruces/go-sqlite3/embed"
+var (
+	Binary []byte // WASM binary to load.
+	Path   string // Path to load the binary from.
+
+	RuntimeConfig wazero.RuntimeConfig
+)
+
+var instance struct {
+	runtime  wazero.Runtime
+	compiled wazero.CompiledModule
+	err      error
+	once     sync.Once
+}
+
+func compileSQLite() {
+	if RuntimeConfig == nil {
+		RuntimeConfig = wazero.NewRuntimeConfig()
+	}
+
+	ctx := context.Background()
+	instance.runtime = wazero.NewRuntimeWithConfig(ctx, RuntimeConfig)
+
+	env := instance.runtime.NewHostModuleBuilder("env")
+	env = vfs.ExportHostFunctions(env)
+	env = exportCallbacks(env)
+	_, instance.err = env.Instantiate(ctx)
+	if instance.err != nil {
+		return
+	}
+
+	bin := Binary
+	if bin == nil && Path != "" {
+		bin, instance.err = os.ReadFile(Path)
+		if instance.err != nil {
+			return
+		}
+	}
+	if bin == nil {
+		instance.err = util.BinaryErr
+		return
+	}
+
+	instance.compiled, instance.err = instance.runtime.CompileModule(ctx, bin)
+}
+
+type sqlite struct {
+	ctx   context.Context
+	mod   api.Module
+	api   sqliteAPI
+	stack [8]uint64
+}
+
+func instantiateSQLite() (sqlt *sqlite, err error) {
+	instance.once.Do(compileSQLite)
+	if instance.err != nil {
+		return nil, instance.err
+	}
+
+	sqlt = new(sqlite)
+	sqlt.ctx = util.NewContext(context.Background())
+
+	sqlt.mod, err = instance.runtime.InstantiateModule(sqlt.ctx,
+		instance.compiled, wazero.NewModuleConfig())
+	if err != nil {
+		return nil, err
+	}
+
+	getFun := func(name string) api.Function {
+		f := sqlt.mod.ExportedFunction(name)
+		if f == nil {
+			err = util.NoFuncErr + util.ErrorString(name)
+			return nil
+		}
+		return f
+	}
+
+	getVal := func(name string) uint32 {
+		g := sqlt.mod.ExportedGlobal(name)
+		if g == nil {
+			err = util.NoGlobalErr + util.ErrorString(name)
+			return 0
+		}
+		return util.ReadUint32(sqlt.mod, uint32(g.Get()))
+	}
+
+	sqlt.api = sqliteAPI{
+		free:            getFun("free"),
+		malloc:          getFun("malloc"),
+		destructor:      getVal("malloc_destructor"),
+		errcode:         getFun("sqlite3_errcode"),
+		errstr:          getFun("sqlite3_errstr"),
+		errmsg:          getFun("sqlite3_errmsg"),
+		erroff:          getFun("sqlite3_error_offset"),
+		open:            getFun("sqlite3_open_v2"),
+		close:           getFun("sqlite3_close"),
+		closeZombie:     getFun("sqlite3_close_v2"),
+		prepare:         getFun("sqlite3_prepare_v3"),
+		finalize:        getFun("sqlite3_finalize"),
+		reset:           getFun("sqlite3_reset"),
+		step:            getFun("sqlite3_step"),
+		exec:            getFun("sqlite3_exec"),
+		interrupt:       getFun("sqlite3_interrupt"),
+		progressHandler: getFun("sqlite3_progress_handler_go"),
+		clearBindings:   getFun("sqlite3_clear_bindings"),
+		bindCount:       getFun("sqlite3_bind_parameter_count"),
+		bindIndex:       getFun("sqlite3_bind_parameter_index"),
+		bindName:        getFun("sqlite3_bind_parameter_name"),
+		bindNull:        getFun("sqlite3_bind_null"),
+		bindInteger:     getFun("sqlite3_bind_int64"),
+		bindFloat:       getFun("sqlite3_bind_double"),
+		bindText:        getFun("sqlite3_bind_text64"),
+		bindBlob:        getFun("sqlite3_bind_blob64"),
+		bindZeroBlob:    getFun("sqlite3_bind_zeroblob64"),
+		bindPointer:     getFun("sqlite3_bind_pointer_go"),
+		columnCount:     getFun("sqlite3_column_count"),
+		columnName:      getFun("sqlite3_column_name"),
+		columnType:      getFun("sqlite3_column_type"),
+		columnInteger:   getFun("sqlite3_column_int64"),
+		columnFloat:     getFun("sqlite3_column_double"),
+		columnText:      getFun("sqlite3_column_text"),
+		columnBlob:      getFun("sqlite3_column_blob"),
+		columnBytes:     getFun("sqlite3_column_bytes"),
+		blobOpen:        getFun("sqlite3_blob_open"),
+		blobClose:       getFun("sqlite3_blob_close"),
+		blobReopen:      getFun("sqlite3_blob_reopen"),
+		blobBytes:       getFun("sqlite3_blob_bytes"),
+		blobRead:        getFun("sqlite3_blob_read"),
+		blobWrite:       getFun("sqlite3_blob_write"),
+		backupInit:      getFun("sqlite3_backup_init"),
+		backupStep:      getFun("sqlite3_backup_step"),
+		backupFinish:    getFun("sqlite3_backup_finish"),
+		backupRemaining: getFun("sqlite3_backup_remaining"),
+		backupPageCount: getFun("sqlite3_backup_pagecount"),
+		changes:         getFun("sqlite3_changes64"),
+		lastRowid:       getFun("sqlite3_last_insert_rowid"),
+		autocommit:      getFun("sqlite3_get_autocommit"),
+		anyCollation:    getFun("sqlite3_anycollseq_init"),
+		createCollation: getFun("sqlite3_create_collation_go"),
+		createFunction:  getFun("sqlite3_create_function_go"),
+		createAggregate: getFun("sqlite3_create_aggregate_function_go"),
+		createWindow:    getFun("sqlite3_create_window_function_go"),
+		aggregateCtx:    getFun("sqlite3_aggregate_context"),
+		userData:        getFun("sqlite3_user_data"),
+		setAuxData:      getFun("sqlite3_set_auxdata_go"),
+		getAuxData:      getFun("sqlite3_get_auxdata"),
+		valueType:       getFun("sqlite3_value_type"),
+		valueInteger:    getFun("sqlite3_value_int64"),
+		valueFloat:      getFun("sqlite3_value_double"),
+		valueText:       getFun("sqlite3_value_text"),
+		valueBlob:       getFun("sqlite3_value_blob"),
+		valueBytes:      getFun("sqlite3_value_bytes"),
+		valuePointer:    getFun("sqlite3_value_pointer_go"),
+		resultNull:      getFun("sqlite3_result_null"),
+		resultInteger:   getFun("sqlite3_result_int64"),
+		resultFloat:     getFun("sqlite3_result_double"),
+		resultText:      getFun("sqlite3_result_text64"),
+		resultBlob:      getFun("sqlite3_result_blob64"),
+		resultZeroBlob:  getFun("sqlite3_result_zeroblob64"),
+		resultPointer:   getFun("sqlite3_result_pointer_go"),
+		resultValue:     getFun("sqlite3_result_value"),
+		resultError:     getFun("sqlite3_result_error"),
+		resultErrorCode: getFun("sqlite3_result_error_code"),
+		resultErrorMem:  getFun("sqlite3_result_error_nomem"),
+		resultErrorBig:  getFun("sqlite3_result_error_toobig"),
+		createModule:    getFun("sqlite3_create_module_go"),
+		declareVTab:     getFun("sqlite3_declare_vtab"),
+		vtabConfig:      getFun("sqlite3_vtab_config_go"),
+		vtabRHSValue:    getFun("sqlite3_vtab_rhs_value"),
+	}
+	if err != nil {
+		return nil, err
+	}
+	return sqlt, nil
+}
+
+func (sqlt *sqlite) close() error {
+	return sqlt.mod.Close(sqlt.ctx)
+}
+
+func (sqlt *sqlite) error(rc uint64, handle uint32, sql ...string) error {
+	if rc == _OK {
+		return nil
+	}
+
+	err := Error{code: rc}
+
+	if err.Code() == NOMEM || err.ExtendedCode() == IOERR_NOMEM {
+		panic(util.OOMErr)
+	}
+
+	if r := sqlt.call(sqlt.api.errstr, rc); r != 0 {
+		err.str = util.ReadString(sqlt.mod, uint32(r), _MAX_NAME)
+	}
+
+	if handle != 0 {
+		if r := sqlt.call(sqlt.api.errmsg, uint64(handle)); r != 0 {
+			err.msg = util.ReadString(sqlt.mod, uint32(r), _MAX_NAME)
+		}
+
+		if sql != nil {
+			if r := sqlt.call(sqlt.api.erroff, uint64(handle)); r != math.MaxUint32 {
+				err.sql = sql[0][r:]
+			}
+		}
+	}
+
+	switch err.msg {
+	case err.str, "not an error":
+		err.msg = ""
+	}
+	return &err
+}
+
+func (sqlt *sqlite) call(fn api.Function, params ...uint64) uint64 {
+	copy(sqlt.stack[:], params)
+	err := fn.CallWithStack(sqlt.ctx, sqlt.stack[:])
+	if err != nil {
+		panic(err)
+	}
+	return sqlt.stack[0]
+}
+
+func (sqlt *sqlite) free(ptr uint32) {
+	if ptr == 0 {
+		return
+	}
+	sqlt.call(sqlt.api.free, uint64(ptr))
+}
+
+func (sqlt *sqlite) new(size uint64) uint32 {
+	if size > _MAX_ALLOCATION_SIZE {
+		panic(util.OOMErr)
+	}
+	ptr := uint32(sqlt.call(sqlt.api.malloc, size))
+	if ptr == 0 && size != 0 {
+		panic(util.OOMErr)
+	}
+	return ptr
+}
+
+func (sqlt *sqlite) newBytes(b []byte) uint32 {
+	if (*[0]byte)(b) == nil {
+		return 0
+	}
+	ptr := sqlt.new(uint64(len(b)))
+	util.WriteBytes(sqlt.mod, ptr, b)
+	return ptr
+}
+
+func (sqlt *sqlite) newString(s string) uint32 {
+	ptr := sqlt.new(uint64(len(s) + 1))
+	util.WriteString(sqlt.mod, ptr, s)
+	return ptr
+}
+
+func (sqlt *sqlite) newArena(size uint64) arena {
+	return arena{
+		sqlt: sqlt,
+		size: uint32(size),
+		base: sqlt.new(size),
+	}
+}
+
+type arena struct {
+	sqlt *sqlite
+	ptrs []uint32
+	base uint32
+	next uint32
+	size uint32
+}
+
+func (a *arena) free() {
+	if a.sqlt == nil {
+		return
+	}
+	a.reset()
+	a.sqlt.free(a.base)
+	a.sqlt = nil
+}
+
+func (a *arena) reset() {
+	for _, ptr := range a.ptrs {
+		a.sqlt.free(ptr)
+	}
+	a.ptrs = nil
+	a.next = 0
+}
+
+func (a *arena) new(size uint64) uint32 {
+	if size <= uint64(a.size-a.next) {
+		ptr := a.base + a.next
+		a.next += uint32(size)
+		return ptr
+	}
+	ptr := a.sqlt.new(size)
+	a.ptrs = append(a.ptrs, ptr)
+	return ptr
+}
+
+func (a *arena) bytes(b []byte) uint32 {
+	if b == nil {
+		return 0
+	}
+	ptr := a.new(uint64(len(b)))
+	util.WriteBytes(a.sqlt.mod, ptr, b)
+	return ptr
+}
+
+func (a *arena) string(s string) uint32 {
+	ptr := a.new(uint64(len(s) + 1))
+	util.WriteString(a.sqlt.mod, ptr, s)
+	return ptr
+}
+
+type sqliteAPI struct {
+	free            api.Function
+	malloc          api.Function
+	errcode         api.Function
+	errstr          api.Function
+	errmsg          api.Function
+	erroff          api.Function
+	open            api.Function
+	close           api.Function
+	closeZombie     api.Function
+	prepare         api.Function
+	finalize        api.Function
+	reset           api.Function
+	step            api.Function
+	exec            api.Function
+	interrupt       api.Function
+	progressHandler api.Function
+	clearBindings   api.Function
+	bindCount       api.Function
+	bindIndex       api.Function
+	bindName        api.Function
+	bindNull        api.Function
+	bindInteger     api.Function
+	bindFloat       api.Function
+	bindText        api.Function
+	bindBlob        api.Function
+	bindZeroBlob    api.Function
+	bindPointer     api.Function
+	columnCount     api.Function
+	columnName      api.Function
+	columnType      api.Function
+	columnInteger   api.Function
+	columnFloat     api.Function
+	columnText      api.Function
+	columnBlob      api.Function
+	columnBytes     api.Function
+	blobOpen        api.Function
+	blobClose       api.Function
+	blobReopen      api.Function
+	blobBytes       api.Function
+	blobRead        api.Function
+	blobWrite       api.Function
+	backupInit      api.Function
+	backupStep      api.Function
+	backupFinish    api.Function
+	backupRemaining api.Function
+	backupPageCount api.Function
+	changes         api.Function
+	lastRowid       api.Function
+	autocommit      api.Function
+	anyCollation    api.Function
+	createCollation api.Function
+	createFunction  api.Function
+	createAggregate api.Function
+	createWindow    api.Function
+	aggregateCtx    api.Function
+	userData        api.Function
+	setAuxData      api.Function
+	getAuxData      api.Function
+	valueType       api.Function
+	valueInteger    api.Function
+	valueFloat      api.Function
+	valueText       api.Function
+	valueBlob       api.Function
+	valueBytes      api.Function
+	valuePointer    api.Function
+	resultNull      api.Function
+	resultInteger   api.Function
+	resultFloat     api.Function
+	resultText      api.Function
+	resultBlob      api.Function
+	resultZeroBlob  api.Function
+	resultPointer   api.Function
+	resultValue     api.Function
+	resultError     api.Function
+	resultErrorCode api.Function
+	resultErrorMem  api.Function
+	resultErrorBig  api.Function
+	createModule    api.Function
+	declareVTab     api.Function
+	vtabConfig      api.Function
+	vtabRHSValue    api.Function
+	destructor      uint32
+}
+
+func exportCallbacks(env wazero.HostModuleBuilder) wazero.HostModuleBuilder {
+	util.ExportFuncII(env, "go_progress", progressCallback)
+	util.ExportFuncVI(env, "go_destroy", destroyCallback)
+	util.ExportFuncVIII(env, "go_func", funcCallback)
+	util.ExportFuncVIII(env, "go_step", stepCallback)
+	util.ExportFuncVI(env, "go_final", finalCallback)
+	util.ExportFuncVI(env, "go_value", valueCallback)
+	util.ExportFuncVIII(env, "go_inverse", inverseCallback)
+	util.ExportFuncIIIIII(env, "go_compare", compareCallback)
+	util.ExportFuncIIIIII(env, "go_vtab_create", vtabModuleCallback(0))
+	util.ExportFuncIIIIII(env, "go_vtab_connect", vtabModuleCallback(1))
+	util.ExportFuncII(env, "go_vtab_disconnect", vtabDisconnectCallback)
+	util.ExportFuncII(env, "go_vtab_destroy", vtabDestroyCallback)
+	util.ExportFuncIII(env, "go_vtab_best_index", vtabBestIndexCallback)
+	util.ExportFuncIIIII(env, "go_vtab_update", vtabUpdateCallback)
+	util.ExportFuncIII(env, "go_vtab_rename", vtabRenameCallback)
+	util.ExportFuncIIIII(env, "go_vtab_find_function", vtabFindFuncCallback)
+	util.ExportFuncII(env, "go_vtab_begin", vtabBeginCallback)
+	util.ExportFuncII(env, "go_vtab_sync", vtabSyncCallback)
+	util.ExportFuncII(env, "go_vtab_commit", vtabCommitCallback)
+	util.ExportFuncII(env, "go_vtab_rollback", vtabRollbackCallback)
+	util.ExportFuncIII(env, "go_vtab_savepoint", vtabSavepointCallback)
+	util.ExportFuncIII(env, "go_vtab_release", vtabReleaseCallback)
+	util.ExportFuncIII(env, "go_vtab_rollback_to", vtabRollbackToCallback)
+	util.ExportFuncIIIIII(env, "go_vtab_integrity", vtabIntegrityCallback)
+	util.ExportFuncIII(env, "go_cur_open", cursorOpenCallback)
+	util.ExportFuncII(env, "go_cur_close", cursorCloseCallback)
+	util.ExportFuncIIIIII(env, "go_cur_filter", cursorFilterCallback)
+	util.ExportFuncII(env, "go_cur_next", cursorNextCallback)
+	util.ExportFuncII(env, "go_cur_eof", cursorEOFCallback)
+	util.ExportFuncIIII(env, "go_cur_column", cursorColumnCallback)
+	util.ExportFuncIII(env, "go_cur_rowid", cursorRowIDCallback)
+	return env
+}

sqlite3/.gitignore

@@ -1,3 +1,4 @@
+ext/
 sqlite3.c
 sqlite3.h
 sqlite3ext.h

sqlite3/deserialize.patch

@@ -1,20 +0,0 @@
---- sqlite3.c.orig
-+++ sqlite3.c
-@@ -60425,7 +60425,7 @@
-   int rc = SQLITE_OK;      /* Return code */
-   int tempFile = 0;        /* True for temp files (incl. in-memory files) */
-   int memDb = 0;           /* True if this is an in-memory file */
--#ifndef SQLITE_OMIT_DESERIALIZE
-+#if 1
-   int memJM = 0;           /* Memory journal mode */
- #else
- # define memJM 0
-@@ -60628,7 +60628,7 @@
-     int fout = 0;                    /* VFS flags returned by xOpen() */
-     rc = sqlite3OsOpen(pVfs, pPager->zFilename, pPager->fd, vfsFlags, &fout);
-     assert( !memDb );
--#ifndef SQLITE_OMIT_DESERIALIZE
-+#if 1
-     pPager->memVfs = memJM = (fout&SQLITE_OPEN_MEMORY)!=0;
- #endif
-     readOnly = (fout&SQLITE_OPEN_READONLY)!=0;

sqlite3/download.sh

@@ -3,32 +3,33 @@ set -euo pipefail
 
 cd -P -- "$(dirname -- "$0")"
 
-curl -#OL "https://sqlite.org/2023/sqlite-amalgamation-3420000.zip"
+curl -#OL "https://sqlite.org/2023/sqlite-amalgamation-3440200.zip"
 unzip -d . sqlite-amalgamation-*.zip
 mv sqlite-amalgamation-*/sqlite3* .
 rm -rf sqlite-amalgamation-*
 
-patch < vfs_find.patch
-patch < deserialize.patch
+cat *.patch | patch --posix
 
+mkdir -p ext/
 cd ext/
-curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.42.0/ext/misc/decimal.c"
-curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.42.0/ext/misc/uint.c"
-curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.42.0/ext/misc/uuid.c"
-curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.42.0/ext/misc/base64.c"
-curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.42.0/ext/misc/regexp.c"
-curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.42.0/ext/misc/series.c"
+curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.44.2/ext/misc/decimal.c"
+curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.44.2/ext/misc/uint.c"
+curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.44.2/ext/misc/uuid.c"
+curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.44.2/ext/misc/base64.c"
+curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.44.2/ext/misc/regexp.c"
+curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.44.2/ext/misc/series.c"
+curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.44.2/ext/misc/anycollseq.c"
 cd ~-
 
 cd ../vfs/tests/mptest/testdata/
-curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.42.0/mptest/mptest.c"
-curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.42.0/mptest/config01.test"
-curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.42.0/mptest/config02.test"
-curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.42.0/mptest/crash01.test"
-curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.42.0/mptest/crash02.subtest"
-curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.42.0/mptest/multiwrite01.test"
+curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.44.2/mptest/mptest.c"
+curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.44.2/mptest/config01.test"
+curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.44.2/mptest/config02.test"
+curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.44.2/mptest/crash01.test"
+curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.44.2/mptest/crash02.subtest"
+curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.44.2/mptest/multiwrite01.test"
 cd ~-
 
 cd ../vfs/tests/speedtest1/testdata/
-curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.42.0/test/speedtest1.c"
+curl -#OL "https://github.com/sqlite/sqlite/raw/version-3.44.2/test/speedtest1.c"
 cd ~-

sqlite3/ext/.gitignore

@@ -1 +0,0 @@
-*.c

sqlite3/func.c

@@ -0,0 +1,44 @@
+#include <stddef.h>
+
+#include "include.h"
+#include "sqlite3.h"
+
+void go_func(sqlite3_context *, int, sqlite3_value **);
+void go_step(sqlite3_context *, int, sqlite3_value **);
+void go_final(sqlite3_context *);
+void go_value(sqlite3_context *);
+void go_inverse(sqlite3_context *, int, sqlite3_value **);
+
+int go_compare(go_handle, int, const void *, int, const void *);
+
+int sqlite3_create_collation_go(sqlite3 *db, const char *name, go_handle app) {
+  int rc = sqlite3_create_collation_v2(db, name, SQLITE_UTF8, app, go_compare,
+                                       go_destroy);
+  if (rc) go_destroy(app);
+  return rc;
+}
+
+int sqlite3_create_function_go(sqlite3 *db, const char *name, int argc,
+                               int flags, go_handle app) {
+  return sqlite3_create_function_v2(db, name, argc, SQLITE_UTF8 | flags, app,
+                                    go_func, /*step=*/NULL, /*final=*/NULL,
+                                    go_destroy);
+}
+
+int sqlite3_create_aggregate_function_go(sqlite3 *db, const char *name,
+                                         int argc, int flags, go_handle app) {
+  return sqlite3_create_window_function(db, name, argc, SQLITE_UTF8 | flags,
+                                        app, go_step, go_final, /*value=*/NULL,
+                                        /*inverse=*/NULL, go_destroy);
+}
+
+int sqlite3_create_window_function_go(sqlite3 *db, const char *name, int argc,
+                                      int flags, go_handle app) {
+  return sqlite3_create_window_function(db, name, argc, SQLITE_UTF8 | flags,
+                                        app, go_step, go_final, go_value,
+                                        go_inverse, go_destroy);
+}
+
+void sqlite3_set_auxdata_go(sqlite3_context *ctx, int i, go_handle aux) {
+  sqlite3_set_auxdata(ctx, i, aux, go_destroy);
+}

sqlite3/include.h

@@ -0,0 +1,12 @@
+#pragma once
+
+#include <assert.h>
+#include <stddef.h>
+
+// https://github.com/JuliaLang/julia/blob/v1.9.4/src/julia.h#L67-L68
+#define container_of(ptr, type, member) \
+  ((type *)((char *)(ptr)-offsetof(type, member)))
+
+typedef void *go_handle;
+void go_destroy(go_handle);
+static_assert(sizeof(go_handle) == 4, "Unexpected size");

sqlite3/isoweek.patch

@@ -0,0 +1,34 @@
+# ISO week date specifiers.
+# https://sqlite.org/forum/forumpost/73d99e4497e8e6a7
+--- sqlite3.c.orig
++++ sqlite3.c
+@@ -1373,6 +1373,29 @@ static void strftimeFunc(
+         sqlite3_str_appendchar(&sRes, 1, c);
+         break;
+       }
++      case 'V':  /* Fall thru */
++      case 'G': {
++        DateTime y = x;
++        computeJD(&y);
++        y.validYMD = 0;
++        /* Adjust date to Thursday this week:
++           The number in parentheses is 0 for Monday, 3 for Thursday */
++        y.iJD += (3 - (((y.iJD+43200000)/86400000) % 7))*86400000;
++        computeYMD(&y);
++        if( cf=='G' ){
++          sqlite3_str_appendf(&sRes,"%04d",y.Y);
++        }else{
++          int nDay;             /* Number of days since 1st day of year */
++          i64 tJD = y.iJD;
++          y.validJD = 0;
++          y.M = 1;
++          y.D = 1;
++          computeJD(&y);
++          nDay = (int)((tJD-y.iJD+43200000)/86400000);
++          sqlite3_str_appendf(&sRes,"%02d",nDay/7+1);
++        }
++        break;
++      }
+       case 'Y': {
+         sqlite3_str_appendf(&sRes,"%04d",x.Y);
+         break;

sqlite3/locking_mode.patch

@@ -0,0 +1,14 @@
+# Use exclusive locking mode for WAL databases with v1 VFSes.
+--- sqlite3.c.orig
++++ sqlite3.c
+@@ -63210,7 +63210,9 @@
+ SQLITE_PRIVATE int sqlite3PagerWalSupported(Pager *pPager){
+   const sqlite3_io_methods *pMethods = pPager->fd->pMethods;
+   if( pPager->noLock ) return 0;
+-  return pPager->exclusiveMode || (pMethods->iVersion>=2 && pMethods->xShmMap);
++  if( pMethods->iVersion>=2 && pMethods->xShmMap ) return 1;
++  pPager->exclusiveMode = 1; 
++  return 1;
+ }
+ 
+ /*

sqlite3/main.c

@@ -1,20 +1,22 @@
-#include <stdbool.h>
-#include <stddef.h>
-
-// Configuration
-#include "sqlite_cfg.h"
 // Amalgamation
 #include "sqlite3.c"
-// VFS
-#include "vfs.c"
 // Extensions
+#include "ext/anycollseq.c"
 #include "ext/base64.c"
 #include "ext/decimal.c"
 #include "ext/regexp.c"
 #include "ext/series.c"
 #include "ext/uint.c"
 #include "ext/uuid.c"
+// Bindings
+#include "func.c"
+#include "pointer.c"
+#include "progress.c"
 #include "time.c"
+#include "vfs.c"
+#include "vtab.c"
+
+sqlite3_destructor_type malloc_destructor = &free;
 
 __attribute__((constructor)) void init() {
   sqlite3_initialize();
@@ -25,4 +27,4 @@ __attribute__((constructor)) void init() {
   sqlite3_auto_extension((void (*)(void))sqlite3_uint_init);
   sqlite3_auto_extension((void (*)(void))sqlite3_uuid_init);
   sqlite3_auto_extension((void (*)(void))sqlite3_time_init);
-}
+}

sqlite3/pointer.c

@@ -0,0 +1,17 @@
+
+#include "include.h"
+#include "sqlite3.h"
+
+#define GO_POINTER_TYPE "github.com/ncruces/go-sqlite3.Pointer"
+
+int sqlite3_bind_pointer_go(sqlite3_stmt *stmt, int i, go_handle app) {
+  return sqlite3_bind_pointer(stmt, i, app, GO_POINTER_TYPE, go_destroy);
+}
+
+void sqlite3_result_pointer_go(sqlite3_context *ctx, go_handle app) {
+  sqlite3_result_pointer(ctx, app, GO_POINTER_TYPE, go_destroy);
+}
+
+go_handle sqlite3_value_pointer_go(sqlite3_value *val) {
+  return sqlite3_value_pointer(val, GO_POINTER_TYPE);
+}

sqlite3/progress.c

@@ -0,0 +1,9 @@
+#include <stddef.h>
+
+#include "sqlite3.h"
+
+int go_progress(void *);
+
+void sqlite3_progress_handler_go(sqlite3 *db, int n) {
+  sqlite3_progress_handler(db, n, go_progress, /*arg=*/NULL);
+}

sqlite3/sqlite_cfg.h

@@ -5,12 +5,28 @@
 #define SQLITE_OS_OTHER 1
 #define SQLITE_BYTEORDER 1234
 
+#define HAVE_INT8_T 1
+#define HAVE_INT16_T 1
+#define HAVE_INT32_T 1
+#define HAVE_INT64_T 1
+#define HAVE_UINT8_T 1
+#define HAVE_UINT16_T 1
+#define HAVE_UINT32_T 1
+#define HAVE_UINT64_T 1
 #define HAVE_STDINT_H 1
 #define HAVE_INTTYPES_H 1
 
+#define HAVE_LOG2 1
+#define HAVE_LOG10 1
 #define HAVE_ISNAN 1
+
 #define HAVE_USLEEP 1
+#define HAVE_NANOSLEEP 1
+
+#define HAVE_GMTIME_R 1
 #define HAVE_LOCALTIME_S 1
+
+#define HAVE_MALLOC_H 1
 #define HAVE_MALLOC_USABLE_SIZE 1
 
 // Recommended Options
@@ -23,12 +39,12 @@
 #define SQLITE_MAX_EXPR_DEPTH 0
 #define SQLITE_OMIT_DECLTYPE
 #define SQLITE_OMIT_DEPRECATED
-#define SQLITE_OMIT_PROGRESS_CALLBACK
 #define SQLITE_OMIT_SHARED_CACHE
 #define SQLITE_OMIT_AUTOINIT
 #define SQLITE_USE_ALLOCA
 
 // Other Options
+
 #define SQLITE_ALLOW_URI_AUTHORITY
 #define SQLITE_ENABLE_BATCH_ATOMIC_WRITE
 #define SQLITE_ENABLE_ATOMIC_WRITE
@@ -36,12 +52,9 @@
 
 // Because WASM does not support shared memory,
 // SQLite disables WAL for WASM builds.
-// We set the default locking mode to EXCLUSIVE instead.
-// https://www.sqlite.org/wal.html#noshm
+// We patch SQLite to use exclusive locking mode instead.
+// https://sqlite.org/wal.html#noshm
 #undef SQLITE_OMIT_WAL
-#ifndef SQLITE_DEFAULT_LOCKING_MODE
-#define SQLITE_DEFAULT_LOCKING_MODE 1
-#endif
 
 // Amalgamated Extensions
 
@@ -54,6 +67,8 @@
 #define SQLITE_ENABLE_RTREE 1
 #define SQLITE_ENABLE_GEOPOLY 1
 
+#define SQLITE_SOUNDEX
+
 // Session Extension
 // #define SQLITE_ENABLE_SESSION
 // #define SQLITE_ENABLE_PREUPDATE_HOOK

sqlite3/time.c

@@ -1,3 +1,4 @@
+#include <stddef.h>
 #include <string.h>
 
 #include "sqlite3.h"
@@ -26,7 +27,63 @@ static int time_collation(void *pArg, int nKey1, const void *pKey1, int nKey2,
   return rc;
 }
 
+static void json_time_func(sqlite3_context *context, int argc,
+                           sqlite3_value **argv) {
+  DateTime x;
+  if (isDate(context, argc, argv, &x)) return;
+  if (x.tzSet && x.tz) {
+    x.iJD += x.tz * 60000;
+    if (!validJulianDay(x.iJD)) return;
+    x.validYMD = 0;
+    x.validHMS = 0;
+  }
+  computeYMD_HMS(&x);
+
+  sqlite3 *db = sqlite3_context_db_handle(context);
+  sqlite3_str *res = sqlite3_str_new(db);
+
+  sqlite3_str_appendf(res, "%04d-%02d-%02dT%02d:%02d:%02d",  //
+                      x.Y, x.M, x.D,                         //
+                      x.h, x.m, (int)(x.iJD / 1000 % 60));
+
+  if (x.useSubsec) {
+    int rem = x.iJD % 1000;
+    if (rem) {
+      sqlite3_str_appendchar(res, 1, '.');
+      sqlite3_str_appendchar(res, 1, '0' + rem / 100);
+      if ((rem %= 100)) {
+        sqlite3_str_appendchar(res, 1, '0' + rem / 10);
+        if ((rem %= 10)) {
+          sqlite3_str_appendchar(res, 1, '0' + rem);
+        }
+      }
+    }
+  }
+
+  if (x.tz) {
+    sqlite3_str_appendf(res, "%+03d:%02d", x.tz / 60, abs(x.tz) % 60);
+  } else {
+    sqlite3_str_appendchar(res, 1, 'Z');
+  }
+
+  int rc = sqlite3_str_errcode(res);
+  if (rc) {
+    sqlite3_result_error_code(context, rc);
+    return;
+  }
+
+  int n = sqlite3_str_length(res);
+  sqlite3_result_text(context, sqlite3_str_finish(res), n, sqlite3_free);
+}
+
 int sqlite3_time_init(sqlite3 *db, char **pzErrMsg,
                       const sqlite3_api_routines *pApi) {
-  return sqlite3_create_collation(db, "time", SQLITE_UTF8, 0, time_collation);
+  sqlite3_create_collation_v2(db, "time", SQLITE_UTF8, /*arg=*/NULL,
+                              time_collation,
+                              /*destroy=*/NULL);
+  sqlite3_create_function_v2(
+      db, "json_time", /*nArg=*/-1,
+      SQLITE_UTF8 | SQLITE_DETERMINISTIC | SQLITE_INNOCUOUS, /*arg=*/NULL,
+      json_time_func, /*step=*/NULL, /*final=*/NULL, /*destroy=*/NULL);
+  return SQLITE_OK;
 }

sqlite3/timezone.patch

@@ -0,0 +1,45 @@
+# Set UTC timezone, compute local offset.
+--- sqlite3.c.orig
++++ sqlite3.c
+@@ -340,6 +340,7 @@ static int setDateTimeToCurrent(sqlite3_context *context, DateTime *p){
+   p->iJD = sqlite3StmtCurrentTime(context);
+   if( p->iJD>0 ){
+     p->validJD = 1;
++    p->tzSet = 1;
+     return 0;
+   }else{
+     return 1;
+@@ -355,6 +356,7 @@ static int setDateTimeToCurrent(sqlite3_context *context, DateTime *p){
+ static void setRawDateNumber(DateTime *p, double r){
+   p->s = r;
+   p->rawS = 1;
++  p->tzSet = 1;
+   if( r>=0.0 && r<5373484.5 ){
+     p->iJD = (sqlite3_int64)(r*86400000.0 + 0.5);
+     p->validJD = 1;
+@@ -731,7 +733,16 @@ static int parseModifier(
+       ** show local time.
+       */
+       if( sqlite3_stricmp(z, "localtime")==0 && sqlite3NotPureFunc(pCtx) ){
+-        rc = toLocaltime(p, pCtx);
++        if( p->tzSet!=0 || p->tz==0 ) {
++          rc = toLocaltime(p, pCtx);
++          i64 iOrigJD = p->iJD;
++          p->tzSet = 0;
++          computeJD(p);
++          p->tz = (p->iJD-iOrigJD)/60000;
++          if( abs(p->tz)>= 900 ) p->tz = 0;
++        } else {
++          rc = 0;
++        }
+       }
+       break;
+     }
+@@ -781,6 +792,7 @@ static int parseModifier(
+           p->validJD = 1;
+           p->tzSet = 1;
+         }
++        p->tz = 0;
+         rc = SQLITE_OK;
+       }
+ #endif

sqlite3/vfs.c

@@ -1,5 +1,8 @@
+#include <stdbool.h>
+#include <stddef.h>
 #include <time.h>
 
+#include "include.h"
 #include "sqlite3.h"
 
 int go_localtime(struct tm *, sqlite3_int64);
@@ -58,7 +61,7 @@ static int go_open_wrapper(sqlite3_vfs *vfs, sqlite3_filename zName,
 
 struct go_file {
   sqlite3_file base;
-  int handle;
+  go_handle handle;
 };
 
 int sqlite3_os_init() {
@@ -81,8 +84,6 @@ int sqlite3_os_init() {
   return sqlite3_vfs_register(&os_vfs, /*default=*/true);
 }
 
-sqlite3_destructor_type malloc_destructor = &free;
-
 int localtime_s(struct tm *const pTm, time_t const *const pTime) {
   return go_localtime(pTm, (sqlite3_int64)*pTime);
 }
@@ -90,22 +91,25 @@ int localtime_s(struct tm *const pTm, time_t const *const pTime) {
 sqlite3_vfs *sqlite3_vfs_find(const char *zVfsName) {
   if (zVfsName) {
     static sqlite3_vfs *go_vfs_list;
-    sqlite3_vfs *found = NULL;
-    for (sqlite3_vfs **next = &go_vfs_list; *next;) {
-      sqlite3_vfs *it = *next;
+
+    for (sqlite3_vfs *it = go_vfs_list; it; it = it->pNext) {
+      if (!strcmp(zVfsName, it->zName) && go_vfs_find(it->zName)) {
+        return it;
+      }
+    }
+
+    for (sqlite3_vfs **ptr = &go_vfs_list; *ptr;) {
+      sqlite3_vfs *it = *ptr;
       if (go_vfs_find(it->zName)) {
-        if (!strcmp(zVfsName, it->zName)) found = it;
-        next = &it->pNext;
+        ptr = &it->pNext;
       } else {
-        *next = it->pNext;
+        *ptr = it->pNext;
         free(it);
       }
     }
-    if (found) {
-      return found;
-    }
+
     if (go_vfs_find(zVfsName)) {
-      sqlite3_vfs *prev = go_vfs_list;
+      sqlite3_vfs *head = go_vfs_list;
       go_vfs_list = malloc(sizeof(sqlite3_vfs) + strlen(zVfsName) + 1);
       char *name = (char *)(go_vfs_list + 1);
       strcpy(name, zVfsName);
@@ -114,7 +118,7 @@ sqlite3_vfs *sqlite3_vfs_find(const char *zVfsName) {
           .szOsFile = sizeof(struct go_file),
           .mxPathname = 512,
           .zName = name,
-          .pNext = prev,
+          .pNext = head,
 
           .xOpen = go_open_wrapper,
           .xDelete = go_delete,
@@ -132,6 +136,5 @@ sqlite3_vfs *sqlite3_vfs_find(const char *zVfsName) {
   return sqlite3_vfs_find_orig(zVfsName);
 }
 
-static_assert(offsetof(struct go_file, handle) == 4, "Unexpected offset");
 static_assert(offsetof(sqlite3_vfs, zName) == 16, "Unexpected offset");
-static_assert(offsetof(sqlite3, u1.isInterrupted) == 280, "Unexpected offset");
+static_assert(offsetof(struct go_file, handle) == 4, "Unexpected offset");

sqlite3/vfs_find.patch

@@ -1,3 +1,4 @@
+# Wrap sqlite3_vfs_find.
 --- sqlite3.c.orig
 +++ sqlite3.c
 @@ -25394,7 +25394,7 @@

sqlite3/vtab.c

@@ -0,0 +1,230 @@
+#include <stddef.h>
+
+#include "include.h"
+#include "sqlite3.h"
+
+#define SQLITE_VTAB_CREATOR_GO /******/ 0x01
+#define SQLITE_VTAB_DESTROYER_GO /****/ 0x02
+#define SQLITE_VTAB_UPDATER_GO /******/ 0x04
+#define SQLITE_VTAB_RENAMER_GO /******/ 0x08
+#define SQLITE_VTAB_OVERLOADER_GO /***/ 0x10
+#define SQLITE_VTAB_CHECKER_GO /******/ 0x20
+#define SQLITE_VTAB_TX_GO /***********/ 0x40
+#define SQLITE_VTAB_SAVEPOINTER_GO /**/ 0x80
+
+int go_vtab_create(sqlite3_module *, int argc, const char *const *argv,
+                   sqlite3_vtab **, char **pzErr);
+int go_vtab_connect(sqlite3_module *, int argc, const char *const *argv,
+                    sqlite3_vtab **, char **pzErr);
+
+int go_vtab_disconnect(sqlite3_vtab *);
+int go_vtab_destroy(sqlite3_vtab *);
+int go_vtab_best_index(sqlite3_vtab *, sqlite3_index_info *);
+int go_cur_open(sqlite3_vtab *, sqlite3_vtab_cursor **);
+
+int go_cur_close(sqlite3_vtab_cursor *);
+int go_cur_filter(sqlite3_vtab_cursor *, int idxNum, const char *idxStr,
+                  int argc, sqlite3_value **argv);
+int go_cur_next(sqlite3_vtab_cursor *);
+int go_cur_eof(sqlite3_vtab_cursor *);
+int go_cur_column(sqlite3_vtab_cursor *, sqlite3_context *, int);
+int go_cur_rowid(sqlite3_vtab_cursor *, sqlite3_int64 *pRowid);
+
+int go_vtab_update(sqlite3_vtab *, int, sqlite3_value **, sqlite3_int64 *);
+int go_vtab_rename(sqlite3_vtab *, const char *zNew);
+int go_vtab_find_function(sqlite3_vtab *, int nArg, const char *zName,
+                          go_handle *pxFunc);
+
+int go_vtab_begin(sqlite3_vtab *);
+int go_vtab_sync(sqlite3_vtab *);
+int go_vtab_commit(sqlite3_vtab *);
+int go_vtab_rollback(sqlite3_vtab *);
+
+int go_vtab_savepoint(sqlite3_vtab *, int);
+int go_vtab_release(sqlite3_vtab *, int);
+int go_vtab_rollback_to(sqlite3_vtab *, int);
+
+int go_vtab_integrity(sqlite3_vtab *, const char *zSchema, const char *zTabName,
+                      int mFlags, char **pzErr);
+
+struct go_module {
+  go_handle handle;
+  sqlite3_module base;
+};
+
+struct go_vtab {
+  go_handle handle;
+  sqlite3_vtab base;
+};
+
+struct go_cursor {
+  go_handle handle;
+  sqlite3_vtab_cursor base;
+};
+
+static void go_mod_destroy(void *pAux) {
+  struct go_module *mod = pAux;
+  void *handle = mod->handle;
+  free(mod);
+  go_destroy(handle);
+}
+
+static int go_vtab_create_wrapper(sqlite3 *db, void *pAux, int argc,
+                                  const char *const *argv,
+                                  sqlite3_vtab **ppVTab, char **pzErr) {
+  struct go_vtab *vtab = calloc(1, sizeof(struct go_vtab));
+  if (vtab == NULL) return SQLITE_NOMEM;
+  *ppVTab = &vtab->base;
+
+  struct go_module *mod = pAux;
+  int rc = go_vtab_create(&mod->base, argc, argv, ppVTab, pzErr);
+  if (rc) {
+    if (*pzErr) *pzErr = sqlite3_mprintf("%s", *pzErr);
+    free(vtab);
+  }
+  return rc;
+}
+
+static int go_vtab_connect_wrapper(sqlite3 *db, void *pAux, int argc,
+                                   const char *const *argv,
+                                   sqlite3_vtab **ppVTab, char **pzErr) {
+  struct go_vtab *vtab = calloc(1, sizeof(struct go_vtab));
+  if (vtab == NULL) return SQLITE_NOMEM;
+  *ppVTab = &vtab->base;
+
+  struct go_module *mod = pAux;
+  int rc = go_vtab_connect(&mod->base, argc, argv, ppVTab, pzErr);
+  if (rc) {
+    free(vtab);
+    if (*pzErr) *pzErr = sqlite3_mprintf("%s", *pzErr);
+  }
+  return rc;
+}
+
+static int go_vtab_disconnect_wrapper(sqlite3_vtab *pVTab) {
+  struct go_vtab *vtab = container_of(pVTab, struct go_vtab, base);
+  int rc = go_vtab_disconnect(pVTab);
+  free(vtab);
+  return rc;
+}
+
+static int go_vtab_destroy_wrapper(sqlite3_vtab *pVTab) {
+  struct go_vtab *vtab = container_of(pVTab, struct go_vtab, base);
+  int rc = go_vtab_destroy(pVTab);
+  free(vtab);
+  return rc;
+}
+
+static int go_cur_open_wrapper(sqlite3_vtab *pVTab,
+                               sqlite3_vtab_cursor **ppCursor) {
+  struct go_cursor *cur = calloc(1, sizeof(struct go_cursor));
+  if (cur == NULL) return SQLITE_NOMEM;
+  *ppCursor = &cur->base;
+
+  int rc = go_cur_open(pVTab, ppCursor);
+  if (rc) free(cur);
+  return rc;
+}
+
+static int go_cur_close_wrapper(sqlite3_vtab_cursor *pCursor) {
+  struct go_cursor *cur = container_of(pCursor, struct go_cursor, base);
+  int rc = go_cur_close(pCursor);
+  free(cur);
+  return rc;
+}
+
+static int go_vtab_find_function_wrapper(
+    sqlite3_vtab *pVTab, int nArg, const char *zName,
+    void (**pxFunc)(sqlite3_context *, int, sqlite3_value **), void **ppArg) {
+  struct go_vtab *vtab = container_of(pVTab, struct go_vtab, base);
+
+  go_handle handle;
+  int rc = go_vtab_find_function(pVTab, nArg, zName, &handle);
+  if (rc) {
+    *pxFunc = go_func;
+    *ppArg = handle;
+  }
+  return rc;
+}
+
+static int go_vtab_integrity_wrapper(sqlite3_vtab *pVTab, const char *zSchema,
+                                     const char *zTabName, int mFlags,
+                                     char **pzErr) {
+  int rc = go_vtab_integrity(pVTab, zSchema, zTabName, mFlags, pzErr);
+  if (rc && *pzErr) *pzErr = sqlite3_mprintf("%s", *pzErr);
+  return rc;
+}
+
+int sqlite3_create_module_go(sqlite3 *db, const char *zName, int flags,
+                             go_handle handle) {
+  struct go_module *mod = malloc(sizeof(struct go_module));
+  if (mod == NULL) {
+    go_destroy(handle);
+    return SQLITE_NOMEM;
+  }
+
+  mod->handle = handle;
+  mod->base = (sqlite3_module){
+      .iVersion = 4,
+      .xConnect = go_vtab_connect_wrapper,
+      .xDisconnect = go_vtab_disconnect_wrapper,
+      .xBestIndex = go_vtab_best_index,
+      .xOpen = go_cur_open_wrapper,
+      .xClose = go_cur_close_wrapper,
+      .xFilter = go_cur_filter,
+      .xNext = go_cur_next,
+      .xEof = go_cur_eof,
+      .xColumn = go_cur_column,
+      .xRowid = go_cur_rowid,
+  };
+  if (flags & SQLITE_VTAB_CREATOR_GO) {
+    mod->base.xCreate = go_vtab_create_wrapper;
+  }
+  if (flags & SQLITE_VTAB_DESTROYER_GO) {
+    mod->base.xDestroy = go_vtab_destroy_wrapper;
+  }
+  if (flags & SQLITE_VTAB_UPDATER_GO) {
+    mod->base.xUpdate = go_vtab_update;
+  }
+  if (flags & SQLITE_VTAB_RENAMER_GO) {
+    mod->base.xRename = go_vtab_rename;
+  }
+  if (flags & SQLITE_VTAB_OVERLOADER_GO) {
+    mod->base.xFindFunction = go_vtab_find_function_wrapper;
+  }
+  if (flags & SQLITE_VTAB_CHECKER_GO) {
+    mod->base.xIntegrity = go_vtab_integrity_wrapper;
+  }
+  if (flags & SQLITE_VTAB_TX_GO) {
+    mod->base.xBegin = go_vtab_begin;
+    mod->base.xSync = go_vtab_sync;
+    mod->base.xCommit = go_vtab_commit;
+    mod->base.xRollback = go_vtab_rollback;
+  }
+  if (flags & SQLITE_VTAB_SAVEPOINTER_GO) {
+    mod->base.xSavepoint = go_vtab_savepoint;
+    mod->base.xRelease = go_vtab_release;
+    mod->base.xRollbackTo = go_vtab_rollback_to;
+  }
+  if (mod->base.xCreate && !mod->base.xDestroy) {
+    mod->base.xDestroy = mod->base.xDisconnect;
+  }
+  if (mod->base.xDestroy && !mod->base.xCreate) {
+    mod->base.xCreate = mod->base.xConnect;
+  }
+
+  return sqlite3_create_module_v2(db, zName, &mod->base, mod, go_mod_destroy);
+}
+
+int sqlite3_vtab_config_go(sqlite3 *db, int op, int constraint) {
+  return sqlite3_vtab_config(db, op, constraint);
+}
+
+static_assert(offsetof(struct go_module, base) == 4, "Unexpected offset");
+static_assert(offsetof(struct go_vtab, base) == 4, "Unexpected offset");
+static_assert(offsetof(struct go_cursor, base) == 4, "Unexpected offset");
+static_assert(sizeof(struct sqlite3_index_info) == 72, "Unexpected size");
+static_assert(sizeof(struct sqlite3_index_orderby) == 8, "Unexpected size");
+static_assert(sizeof(struct sqlite3_index_constraint) == 12, "Unexpected size");
+static_assert(sizeof(struct sqlite3_index_constraint_usage) == 8,
+              "Unexpected size");

sqlite_test.go

@@ -3,6 +3,7 @@ package sqlite3
 import (
 	"bytes"
 	"math"
+	"os"
 	"testing"
 
 	"github.com/ncruces/go-sqlite3/internal/util"
@@ -12,67 +13,73 @@ func init() {
 	Path = "./embed/sqlite3.wasm"
 }
 
-func TestConn_error_OOM(t *testing.T) {
+func Test_sqlite_error_OOM(t *testing.T) {
 	t.Parallel()
 
-	m, err := instantiateModule()
+	sqlite, err := instantiateSQLite()
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer m.close()
+	defer sqlite.close()
 
 	defer func() { _ = recover() }()
-	m.error(uint64(NOMEM), 0)
+	sqlite.error(uint64(NOMEM), 0)
 	t.Error("want panic")
 }
 
-func TestConn_call_closed(t *testing.T) {
+func Test_sqlite_call_closed(t *testing.T) {
 	t.Parallel()
 
-	m, err := instantiateModule()
+	sqlite, err := instantiateSQLite()
 	if err != nil {
 		t.Fatal(err)
 	}
-	m.close()
+	sqlite.close()
 
 	defer func() { _ = recover() }()
-	m.call(m.api.free)
+	sqlite.call(sqlite.api.free)
 	t.Error("want panic")
 }
 
-func TestConn_new(t *testing.T) {
+func Test_sqlite_new(t *testing.T) {
 	t.Parallel()
 
-	m, err := instantiateModule()
+	sqlite, err := instantiateSQLite()
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer m.close()
+	defer sqlite.close()
 
 	t.Run("MaxUint32", func(t *testing.T) {
 		defer func() { _ = recover() }()
-		m.new(math.MaxUint32)
+		sqlite.new(math.MaxUint32)
 		t.Error("want panic")
 	})
 
 	t.Run("_MAX_ALLOCATION_SIZE", func(t *testing.T) {
+		if testing.Short() {
+			t.Skip("skipping in short mode")
+		}
+		if os.Getenv("CI") != "" {
+			t.Skip("skipping in CI")
+		}
 		defer func() { _ = recover() }()
-		m.new(_MAX_ALLOCATION_SIZE)
-		m.new(_MAX_ALLOCATION_SIZE)
+		sqlite.new(_MAX_ALLOCATION_SIZE)
+		sqlite.new(_MAX_ALLOCATION_SIZE)
 		t.Error("want panic")
 	})
 }
 
-func TestConn_newArena(t *testing.T) {
+func Test_sqlite_newArena(t *testing.T) {
 	t.Parallel()
 
-	m, err := instantiateModule()
+	sqlite, err := instantiateSQLite()
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer m.close()
+	defer sqlite.close()
 
-	arena := m.newArena(16)
+	arena := sqlite.newArena(16)
 	defer arena.free()
 
 	const title = "Lorem ipsum"
@@ -80,7 +87,7 @@ func TestConn_newArena(t *testing.T) {
 	if ptr == 0 {
 		t.Fatalf("got nullptr")
 	}
-	if got := util.ReadString(m.mod, ptr, math.MaxUint32); got != title {
+	if got := util.ReadString(sqlite.mod, ptr, math.MaxUint32); got != title {
 		t.Errorf("got %q, want %q", got, title)
 	}
 
@@ -89,7 +96,7 @@ func TestConn_newArena(t *testing.T) {
 	if ptr == 0 {
 		t.Fatalf("got nullptr")
 	}
-	if got := util.ReadString(m.mod, ptr, math.MaxUint32); got != body {
+	if got := util.ReadString(sqlite.mod, ptr, math.MaxUint32); got != body {
 		t.Errorf("got %q, want %q", got, body)
 	}
 
@@ -101,121 +108,130 @@ func TestConn_newArena(t *testing.T) {
 	if ptr == 0 {
 		t.Fatalf("got nullptr")
 	}
-	if got := util.View(m.mod, ptr, uint64(len(title))); string(got) != title {
+	if got := util.View(sqlite.mod, ptr, uint64(len(title))); string(got) != title {
 		t.Errorf("got %q, want %q", got, title)
 	}
 
 	arena.free()
 }
 
-func TestConn_newBytes(t *testing.T) {
+func Test_sqlite_newBytes(t *testing.T) {
 	t.Parallel()
 
-	m, err := instantiateModule()
+	sqlite, err := instantiateSQLite()
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer m.close()
+	defer sqlite.close()
 
-	ptr := m.newBytes(nil)
+	ptr := sqlite.newBytes(nil)
 	if ptr != 0 {
 		t.Errorf("got %#x, want nullptr", ptr)
 	}
 
 	buf := []byte("sqlite3")
-	ptr = m.newBytes(buf)
+	ptr = sqlite.newBytes(buf)
 	if ptr == 0 {
 		t.Fatal("got nullptr, want a pointer")
 	}
 
 	want := buf
-	if got := util.View(m.mod, ptr, uint64(len(want))); !bytes.Equal(got, want) {
+	if got := util.View(sqlite.mod, ptr, uint64(len(want))); !bytes.Equal(got, want) {
 		t.Errorf("got %q, want %q", got, want)
 	}
+
+	ptr = sqlite.newBytes(buf[:0])
+	if ptr == 0 {
+		t.Fatal("got nullptr, want a pointer")
+	}
+
+	if got := util.View(sqlite.mod, ptr, 0); got != nil {
+		t.Errorf("got %q, want nil", got)
+	}
 }
 
-func TestConn_newString(t *testing.T) {
+func Test_sqlite_newString(t *testing.T) {
 	t.Parallel()
 
-	m, err := instantiateModule()
+	sqlite, err := instantiateSQLite()
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer m.close()
+	defer sqlite.close()
 
-	ptr := m.newString("")
+	ptr := sqlite.newString("")
 	if ptr == 0 {
 		t.Error("got nullptr, want a pointer")
 	}
 
 	str := "sqlite3\000sqlite3"
-	ptr = m.newString(str)
+	ptr = sqlite.newString(str)
 	if ptr == 0 {
 		t.Fatal("got nullptr, want a pointer")
 	}
 
 	want := str + "\000"
-	if got := util.View(m.mod, ptr, uint64(len(want))); string(got) != want {
+	if got := util.View(sqlite.mod, ptr, uint64(len(want))); string(got) != want {
 		t.Errorf("got %q, want %q", got, want)
 	}
 }
 
-func TestConn_getString(t *testing.T) {
+func Test_sqlite_getString(t *testing.T) {
 	t.Parallel()
 
-	m, err := instantiateModule()
+	sqlite, err := instantiateSQLite()
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer m.close()
+	defer sqlite.close()
 
-	ptr := m.newString("")
+	ptr := sqlite.newString("")
 	if ptr == 0 {
 		t.Error("got nullptr, want a pointer")
 	}
 
 	str := "sqlite3" + "\000 drop this"
-	ptr = m.newString(str)
+	ptr = sqlite.newString(str)
 	if ptr == 0 {
 		t.Fatal("got nullptr, want a pointer")
 	}
 
 	want := "sqlite3"
-	if got := util.ReadString(m.mod, ptr, math.MaxUint32); got != want {
+	if got := util.ReadString(sqlite.mod, ptr, math.MaxUint32); got != want {
 		t.Errorf("got %q, want %q", got, want)
 	}
-	if got := util.ReadString(m.mod, ptr, 0); got != "" {
+	if got := util.ReadString(sqlite.mod, ptr, 0); got != "" {
 		t.Errorf("got %q, want empty", got)
 	}
 
 	func() {
 		defer func() { _ = recover() }()
-		util.ReadString(m.mod, ptr, uint32(len(want)/2))
+		util.ReadString(sqlite.mod, ptr, uint32(len(want)/2))
 		t.Error("want panic")
 	}()
 
 	func() {
 		defer func() { _ = recover() }()
-		util.ReadString(m.mod, 0, math.MaxUint32)
+		util.ReadString(sqlite.mod, 0, math.MaxUint32)
 		t.Error("want panic")
 	}()
 }
 
-func TestConn_free(t *testing.T) {
+func Test_sqlite_free(t *testing.T) {
 	t.Parallel()
 
-	m, err := instantiateModule()
+	sqlite, err := instantiateSQLite()
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer m.close()
+	defer sqlite.close()
 
-	m.free(0)
+	sqlite.free(0)
 
-	ptr := m.new(1)
+	ptr := sqlite.new(1)
 	if ptr == 0 {
 		t.Error("got nullptr, want a pointer")
 	}
 
-	m.free(ptr)
+	sqlite.free(ptr)
 }

stmt.go

@@ -1,7 +1,9 @@
 package sqlite3
 
 import (
+	"encoding/json"
 	"math"
+	"strconv"
 	"time"
 
 	"github.com/ncruces/go-sqlite3/internal/util"
@@ -9,7 +11,7 @@ import (
 
 // Stmt is a prepared statement object.
 //
-// https://www.sqlite.org/c3ref/stmt.html
+// https://sqlite.org/c3ref/stmt.html
 type Stmt struct {
 	c      *Conn
 	err    error
@@ -20,7 +22,7 @@ type Stmt struct {
 //
 // It is safe to close a nil, zero or closed Stmt.
 //
-// https://www.sqlite.org/c3ref/finalize.html
+// https://sqlite.org/c3ref/finalize.html
 func (s *Stmt) Close() error {
 	if s == nil || s.handle == 0 {
 		return nil
@@ -34,7 +36,7 @@ func (s *Stmt) Close() error {
 
 // Reset resets the prepared statement object.
 //
-// https://www.sqlite.org/c3ref/reset.html
+// https://sqlite.org/c3ref/reset.html
 func (s *Stmt) Reset() error {
 	r := s.c.call(s.c.api.reset, uint64(s.handle))
 	s.err = nil
@@ -43,7 +45,7 @@ func (s *Stmt) Reset() error {
 
 // ClearBindings resets all bindings on the prepared statement.
 //
-// https://www.sqlite.org/c3ref/clear_bindings.html
+// https://sqlite.org/c3ref/clear_bindings.html
 func (s *Stmt) ClearBindings() error {
 	r := s.c.call(s.c.api.clearBindings, uint64(s.handle))
 	return s.c.error(r)
@@ -57,16 +59,16 @@ func (s *Stmt) ClearBindings() error {
 // If an error has occurred, Step returns false;
 // call [Stmt.Err] or [Stmt.Reset] to get the error.
 //
-// https://www.sqlite.org/c3ref/step.html
+// https://sqlite.org/c3ref/step.html
 func (s *Stmt) Step() bool {
 	s.c.checkInterrupt()
 	r := s.c.call(s.c.api.step, uint64(s.handle))
-	if r == _ROW {
+	switch r {
+	case _ROW:
 		return true
-	}
-	if r == _DONE {
+	case _DONE:
 		s.err = nil
-	} else {
+	default:
 		s.err = s.c.error(r)
 	}
 	return false
@@ -75,7 +77,7 @@ func (s *Stmt) Step() bool {
 // Err gets the last error occurred during [Stmt.Step].
 // Err returns nil after [Stmt.Reset] is called.
 //
-// https://www.sqlite.org/c3ref/step.html
+// https://sqlite.org/c3ref/step.html
 func (s *Stmt) Err() error {
 	return s.err
 }
@@ -90,7 +92,7 @@ func (s *Stmt) Exec() error {
 
 // BindCount returns the number of SQL parameters in the prepared statement.
 //
-// https://www.sqlite.org/c3ref/bind_parameter_count.html
+// https://sqlite.org/c3ref/bind_parameter_count.html
 func (s *Stmt) BindCount() int {
 	r := s.c.call(s.c.api.bindCount,
 		uint64(s.handle))
@@ -100,7 +102,7 @@ func (s *Stmt) BindCount() int {
 // BindIndex returns the index of a parameter in the prepared statement
 // given its name.
 //
-// https://www.sqlite.org/c3ref/bind_parameter_index.html
+// https://sqlite.org/c3ref/bind_parameter_index.html
 func (s *Stmt) BindIndex(name string) int {
 	defer s.c.arena.reset()
 	namePtr := s.c.arena.string(name)
@@ -112,7 +114,7 @@ func (s *Stmt) BindIndex(name string) int {
 // BindName returns the name of a parameter in the prepared statement.
 // The leftmost SQL parameter has an index of 1.
 //
-// https://www.sqlite.org/c3ref/bind_parameter_name.html
+// https://sqlite.org/c3ref/bind_parameter_name.html
 func (s *Stmt) BindName(param int) string {
 	r := s.c.call(s.c.api.bindName,
 		uint64(s.handle), uint64(param))
@@ -121,7 +123,7 @@ func (s *Stmt) BindName(param int) string {
 	if ptr == 0 {
 		return ""
 	}
-	return util.ReadString(s.c.mod, ptr, _MAX_STRING)
+	return util.ReadString(s.c.mod, ptr, _MAX_NAME)
 }
 
 // BindBool binds a bool to the prepared statement.
@@ -129,18 +131,19 @@ func (s *Stmt) BindName(param int) string {
 // SQLite does not have a separate boolean storage class.
 // Instead, boolean values are stored as integers 0 (false) and 1 (true).
 //
-// https://www.sqlite.org/c3ref/bind_blob.html
+// https://sqlite.org/c3ref/bind_blob.html
 func (s *Stmt) BindBool(param int, value bool) error {
+	var i int64
 	if value {
-		return s.BindInt64(param, 1)
+		i = 1
 	}
-	return s.BindInt64(param, 0)
+	return s.BindInt64(param, i)
 }
 
 // BindInt binds an int to the prepared statement.
 // The leftmost SQL parameter has an index of 1.
 //
-// https://www.sqlite.org/c3ref/bind_blob.html
+// https://sqlite.org/c3ref/bind_blob.html
 func (s *Stmt) BindInt(param int, value int) error {
 	return s.BindInt64(param, int64(value))
 }
@@ -148,7 +151,7 @@ func (s *Stmt) BindInt(param int, value int) error {
 // BindInt64 binds an int64 to the prepared statement.
 // The leftmost SQL parameter has an index of 1.
 //
-// https://www.sqlite.org/c3ref/bind_blob.html
+// https://sqlite.org/c3ref/bind_blob.html
 func (s *Stmt) BindInt64(param int, value int64) error {
 	r := s.c.call(s.c.api.bindInteger,
 		uint64(s.handle), uint64(param), uint64(value))
@@ -158,7 +161,7 @@ func (s *Stmt) BindInt64(param int, value int64) error {
 // BindFloat binds a float64 to the prepared statement.
 // The leftmost SQL parameter has an index of 1.
 //
-// https://www.sqlite.org/c3ref/bind_blob.html
+// https://sqlite.org/c3ref/bind_blob.html
 func (s *Stmt) BindFloat(param int, value float64) error {
 	r := s.c.call(s.c.api.bindFloat,
 		uint64(s.handle), uint64(param), math.Float64bits(value))
@@ -168,8 +171,11 @@ func (s *Stmt) BindFloat(param int, value float64) error {
 // BindText binds a string to the prepared statement.
 // The leftmost SQL parameter has an index of 1.
 //
-// https://www.sqlite.org/c3ref/bind_blob.html
+// https://sqlite.org/c3ref/bind_blob.html
 func (s *Stmt) BindText(param int, value string) error {
+	if len(value) > _MAX_LENGTH {
+		return TOOBIG
+	}
 	ptr := s.c.newString(value)
 	r := s.c.call(s.c.api.bindText,
 		uint64(s.handle), uint64(param),
@@ -178,12 +184,31 @@ func (s *Stmt) BindText(param int, value string) error {
 	return s.c.error(r)
 }
 
+// BindRawText binds a []byte to the prepared statement as text.
+// The leftmost SQL parameter has an index of 1.
+//
+// https://sqlite.org/c3ref/bind_blob.html
+func (s *Stmt) BindRawText(param int, value []byte) error {
+	if len(value) > _MAX_LENGTH {
+		return TOOBIG
+	}
+	ptr := s.c.newBytes(value)
+	r := s.c.call(s.c.api.bindText,
+		uint64(s.handle), uint64(param),
+		uint64(ptr), uint64(len(value)),
+		uint64(s.c.api.destructor), _UTF8)
+	return s.c.error(r)
+}
+
 // BindBlob binds a []byte to the prepared statement.
 // The leftmost SQL parameter has an index of 1.
 // Binding a nil slice is the same as calling [Stmt.BindNull].
 //
-// https://www.sqlite.org/c3ref/bind_blob.html
+// https://sqlite.org/c3ref/bind_blob.html
 func (s *Stmt) BindBlob(param int, value []byte) error {
+	if len(value) > _MAX_LENGTH {
+		return TOOBIG
+	}
 	ptr := s.c.newBytes(value)
 	r := s.c.call(s.c.api.bindBlob,
 		uint64(s.handle), uint64(param),
@@ -195,7 +220,7 @@ func (s *Stmt) BindBlob(param int, value []byte) error {
 // BindZeroBlob binds a zero-filled, length n BLOB to the prepared statement.
 // The leftmost SQL parameter has an index of 1.
 //
-// https://www.sqlite.org/c3ref/bind_blob.html
+// https://sqlite.org/c3ref/bind_blob.html
 func (s *Stmt) BindZeroBlob(param int, n int64) error {
 	r := s.c.call(s.c.api.bindZeroBlob,
 		uint64(s.handle), uint64(param), uint64(n))
@@ -205,7 +230,7 @@ func (s *Stmt) BindZeroBlob(param int, n int64) error {
 // BindNull binds a NULL to the prepared statement.
 // The leftmost SQL parameter has an index of 1.
 //
-// https://www.sqlite.org/c3ref/bind_blob.html
+// https://sqlite.org/c3ref/bind_blob.html
 func (s *Stmt) BindNull(param int) error {
 	r := s.c.call(s.c.api.bindNull,
 		uint64(s.handle), uint64(param))
@@ -215,7 +240,7 @@ func (s *Stmt) BindNull(param int) error {
 // BindTime binds a [time.Time] to the prepared statement.
 // The leftmost SQL parameter has an index of 1.
 //
-// https://www.sqlite.org/c3ref/bind_blob.html
+// https://sqlite.org/c3ref/bind_blob.html
 func (s *Stmt) BindTime(param int, value time.Time, format TimeFormat) error {
 	if format == TimeFormatDefault {
 		return s.bindRFC3339Nano(param, value)
@@ -234,7 +259,7 @@ func (s *Stmt) BindTime(param int, value time.Time, format TimeFormat) error {
 }
 
 func (s *Stmt) bindRFC3339Nano(param int, value time.Time) error {
-	const maxlen = uint64(len(time.RFC3339Nano))
+	const maxlen = uint64(len(time.RFC3339Nano)) + 5
 
 	ptr := s.c.new(maxlen)
 	buf := util.View(s.c.mod, ptr, maxlen)
@@ -247,9 +272,34 @@ func (s *Stmt) bindRFC3339Nano(param int, value time.Time) error {
 	return s.c.error(r)
 }
 
+// BindPointer binds a NULL to the prepared statement, just like [Stmt.BindNull],
+// but it also associates ptr with that NULL value such that it can be retrieved
+// within an application-defined SQL function using [Value.Pointer].
+// The leftmost SQL parameter has an index of 1.
+//
+// https://sqlite.org/c3ref/bind_blob.html
+func (s *Stmt) BindPointer(param int, ptr any) error {
+	valPtr := util.AddHandle(s.c.ctx, ptr)
+	r := s.c.call(s.c.api.bindPointer,
+		uint64(s.handle), uint64(param), uint64(valPtr))
+	return s.c.error(r)
+}
+
+// BindJSON binds the JSON encoding of value to the prepared statement.
+// The leftmost SQL parameter has an index of 1.
+//
+// https://sqlite.org/c3ref/bind_blob.html
+func (s *Stmt) BindJSON(param int, value any) error {
+	data, err := json.Marshal(value)
+	if err != nil {
+		return err
+	}
+	return s.BindRawText(param, data)
+}
+
 // ColumnCount returns the number of columns in a result set.
 //
-// https://www.sqlite.org/c3ref/column_count.html
+// https://sqlite.org/c3ref/column_count.html
 func (s *Stmt) ColumnCount() int {
 	r := s.c.call(s.c.api.columnCount,
 		uint64(s.handle))
@@ -259,7 +309,7 @@ func (s *Stmt) ColumnCount() int {
 // ColumnName returns the name of the result column.
 // The leftmost column of the result set has the index 0.
 //
-// https://www.sqlite.org/c3ref/column_name.html
+// https://sqlite.org/c3ref/column_name.html
 func (s *Stmt) ColumnName(col int) string {
 	r := s.c.call(s.c.api.columnName,
 		uint64(s.handle), uint64(col))
@@ -268,13 +318,13 @@ func (s *Stmt) ColumnName(col int) string {
 	if ptr == 0 {
 		panic(util.OOMErr)
 	}
-	return util.ReadString(s.c.mod, ptr, _MAX_STRING)
+	return util.ReadString(s.c.mod, ptr, _MAX_NAME)
 }
 
 // ColumnType returns the initial [Datatype] of the result column.
 // The leftmost column of the result set has the index 0.
 //
-// https://www.sqlite.org/c3ref/column_blob.html
+// https://sqlite.org/c3ref/column_blob.html
 func (s *Stmt) ColumnType(col int) Datatype {
 	r := s.c.call(s.c.api.columnType,
 		uint64(s.handle), uint64(col))
@@ -287,7 +337,7 @@ func (s *Stmt) ColumnType(col int) Datatype {
 // Instead, boolean values are retrieved as integers,
 // with 0 converted to false and any other value to true.
 //
-// https://www.sqlite.org/c3ref/column_blob.html
+// https://sqlite.org/c3ref/column_blob.html
 func (s *Stmt) ColumnBool(col int) bool {
 	if i := s.ColumnInt64(col); i != 0 {
 		return true
@@ -298,7 +348,7 @@ func (s *Stmt) ColumnBool(col int) bool {
 // ColumnInt returns the value of the result column as an int.
 // The leftmost column of the result set has the index 0.
 //
-// https://www.sqlite.org/c3ref/column_blob.html
+// https://sqlite.org/c3ref/column_blob.html
 func (s *Stmt) ColumnInt(col int) int {
 	return int(s.ColumnInt64(col))
 }
@@ -306,7 +356,7 @@ func (s *Stmt) ColumnInt(col int) int {
 // ColumnInt64 returns the value of the result column as an int64.
 // The leftmost column of the result set has the index 0.
 //
-// https://www.sqlite.org/c3ref/column_blob.html
+// https://sqlite.org/c3ref/column_blob.html
 func (s *Stmt) ColumnInt64(col int) int64 {
 	r := s.c.call(s.c.api.columnInteger,
 		uint64(s.handle), uint64(col))
@@ -316,7 +366,7 @@ func (s *Stmt) ColumnInt64(col int) int64 {
 // ColumnFloat returns the value of the result column as a float64.
 // The leftmost column of the result set has the index 0.
 //
-// https://www.sqlite.org/c3ref/column_blob.html
+// https://sqlite.org/c3ref/column_blob.html
 func (s *Stmt) ColumnFloat(col int) float64 {
 	r := s.c.call(s.c.api.columnFloat,
 		uint64(s.handle), uint64(col))
@@ -326,7 +376,7 @@ func (s *Stmt) ColumnFloat(col int) float64 {
 // ColumnTime returns the value of the result column as a [time.Time].
 // The leftmost column of the result set has the index 0.
 //
-// https://www.sqlite.org/c3ref/column_blob.html
+// https://sqlite.org/c3ref/column_blob.html
 func (s *Stmt) ColumnTime(col int, format TimeFormat) time.Time {
 	var v any
 	switch s.ColumnType(col) {
@@ -351,7 +401,7 @@ func (s *Stmt) ColumnTime(col int, format TimeFormat) time.Time {
 // ColumnText returns the value of the result column as a string.
 // The leftmost column of the result set has the index 0.
 //
-// https://www.sqlite.org/c3ref/column_blob.html
+// https://sqlite.org/c3ref/column_blob.html
 func (s *Stmt) ColumnText(col int) string {
 	return string(s.ColumnRawText(col))
 }
@@ -360,7 +410,7 @@ func (s *Stmt) ColumnText(col int) string {
 // the value of the result column as a []byte.
 // The leftmost column of the result set has the index 0.
 //
-// https://www.sqlite.org/c3ref/column_blob.html
+// https://sqlite.org/c3ref/column_blob.html
 func (s *Stmt) ColumnBlob(col int, buf []byte) []byte {
 	return append(buf, s.ColumnRawBlob(col)...)
 }
@@ -370,22 +420,11 @@ func (s *Stmt) ColumnBlob(col int, buf []byte) []byte {
 // subsequent calls to [Stmt] methods.
 // The leftmost column of the result set has the index 0.
 //
-// https://www.sqlite.org/c3ref/column_blob.html
+// https://sqlite.org/c3ref/column_blob.html
 func (s *Stmt) ColumnRawText(col int) []byte {
 	r := s.c.call(s.c.api.columnText,
 		uint64(s.handle), uint64(col))
-
-	ptr := uint32(r)
-	if ptr == 0 {
-		r = s.c.call(s.c.api.errcode, uint64(s.c.handle))
-		s.err = s.c.error(r)
-		return nil
-	}
-
-	r = s.c.call(s.c.api.columnBytes,
-		uint64(s.handle), uint64(col))
-
-	return util.View(s.c.mod, ptr, r)
+	return s.columnRawBytes(col, uint32(r))
 }
 
 // ColumnRawBlob returns the value of the result column as a []byte.
@@ -393,24 +432,49 @@ func (s *Stmt) ColumnRawText(col int) []byte {
 // subsequent calls to [Stmt] methods.
 // The leftmost column of the result set has the index 0.
 //
-// https://www.sqlite.org/c3ref/column_blob.html
+// https://sqlite.org/c3ref/column_blob.html
 func (s *Stmt) ColumnRawBlob(col int) []byte {
 	r := s.c.call(s.c.api.columnBlob,
 		uint64(s.handle), uint64(col))
+	return s.columnRawBytes(col, uint32(r))
+}
 
-	ptr := uint32(r)
+func (s *Stmt) columnRawBytes(col int, ptr uint32) []byte {
 	if ptr == 0 {
-		r = s.c.call(s.c.api.errcode, uint64(s.c.handle))
+		r := s.c.call(s.c.api.errcode, uint64(s.c.handle))
 		s.err = s.c.error(r)
 		return nil
 	}
 
-	r = s.c.call(s.c.api.columnBytes,
+	r := s.c.call(s.c.api.columnBytes,
 		uint64(s.handle), uint64(col))
-
 	return util.View(s.c.mod, ptr, r)
 }
 
+// ColumnJSON parses the JSON-encoded value of the result column
+// and stores it in the value pointed to by ptr.
+// The leftmost column of the result set has the index 0.
+//
+// https://sqlite.org/c3ref/column_blob.html
+func (s *Stmt) ColumnJSON(col int, ptr any) error {
+	var data []byte
+	switch s.ColumnType(col) {
+	case NULL:
+		data = append(data, "null"...)
+	case TEXT:
+		data = s.ColumnRawText(col)
+	case BLOB:
+		data = s.ColumnRawBlob(col)
+	case INTEGER:
+		data = strconv.AppendInt(nil, s.ColumnInt64(col), 10)
+	case FLOAT:
+		data = strconv.AppendFloat(nil, s.ColumnFloat(col), 'g', -1, 64)
+	default:
+		panic(util.AssertErr())
+	}
+	return json.Unmarshal(data, ptr)
+}
+
 // Return true if stmt is an empty SQL statement.
 // This is used as an optimization.
 // It's OK to always return false here.

stmt_test.go

@@ -1,8 +1,6 @@
 package sqlite3
 
-import (
-	"testing"
-)
+import "testing"
 
 func Test_emptyStatement(t *testing.T) {
 	t.Parallel()

tests/bradfitz/sql_test.go

@@ -43,7 +43,7 @@ func (t params) mustExec(sql string, args ...interface{}) sql.Result {
 func (sqliteDB) RunTest(t *testing.T, fn func(params)) {
 	db, err := sql.Open("sqlite3", "file:"+
 		filepath.Join(t.TempDir(), "foo.db")+
-		"?_pragma=busy_timeout(10000)&_pragma=locking_mode(normal)&_pragma=synchronous(off)")
+		"?_pragma=busy_timeout(10000)&_pragma=synchronous(off)")
 	if err != nil {
 		t.Fatalf("foo.db open fail: %v", err)
 	}

tests/conn_test.go

@@ -75,8 +75,8 @@ func TestConn_Open_modeof(t *testing.T) {
 }
 
 func TestConn_Close(t *testing.T) {
-	var conn *sqlite3.Conn
-	conn.Close()
+	var db *sqlite3.Conn
+	db.Close()
 }
 
 func TestConn_Close_BUSY(t *testing.T) {
@@ -182,7 +182,7 @@ func TestConn_SetInterrupt(t *testing.T) {
 	defer stmt.Close()
 
 	db.SetInterrupt(ctx)
-	cancel()
+	go cancel()
 
 	// Interrupting works.
 	err = stmt.Exec()

tests/db_test.go

@@ -1,14 +1,20 @@
 package tests
 
 import (
+	"os"
 	"path/filepath"
 	"testing"
 
+	_ "embed"
+
 	"github.com/ncruces/go-sqlite3"
 	_ "github.com/ncruces/go-sqlite3/embed"
 	_ "github.com/ncruces/go-sqlite3/vfs/memdb"
 )
 
+//go:embed testdata/wal.db
+var waldb []byte
+
 func TestDB_memory(t *testing.T) {
 	t.Parallel()
 	testDB(t, ":memory:")
@@ -19,11 +25,28 @@ func TestDB_file(t *testing.T) {
 	testDB(t, filepath.Join(t.TempDir(), "test.db"))
 }
 
+func TestDB_nolock(t *testing.T) {
+	t.Parallel()
+	testDB(t, "file:"+
+		filepath.ToSlash(filepath.Join(t.TempDir(), "test.db"))+
+		"?nolock=1")
+}
+
+func TestDB_wal(t *testing.T) {
+	t.Parallel()
+	wal := filepath.Join(t.TempDir(), "test.db")
+	err := os.WriteFile(wal, waldb, 0666)
+	if err != nil {
+		t.Fatal(err)
+	}
+	testDB(t, wal)
+}
+
 func TestDB_vfs(t *testing.T) {
 	testDB(t, "file:test.db?vfs=memdb")
 }
 
-func testDB(t *testing.T, name string) {
+func testDB(t testing.TB, name string) {
 	db, err := sqlite3.Open(name)
 	if err != nil {
 		t.Fatal(err)

tests/driver_test.go

@@ -2,10 +2,9 @@ package tests
 
 import (
 	"context"
-	"database/sql"
 	"testing"
 
-	_ "github.com/ncruces/go-sqlite3/driver"
+	"github.com/ncruces/go-sqlite3/driver"
 	_ "github.com/ncruces/go-sqlite3/embed"
 )
 
@@ -15,7 +14,7 @@ func TestDriver(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
-	db, err := sql.Open("sqlite3", ":memory:")
+	db, err := driver.Open(":memory:", nil)
 	if err != nil {
 		t.Fatal(err)
 	}

tests/ext_test.go

@@ -4,6 +4,7 @@ import (
 	"testing"
 
 	"github.com/ncruces/go-sqlite3"
+	_ "github.com/ncruces/go-sqlite3/embed"
 )
 
 func Test_base64(t *testing.T) {

tests/func_test.go

@@ -0,0 +1,218 @@
+package tests
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/ncruces/go-sqlite3"
+	_ "github.com/ncruces/go-sqlite3/embed"
+)
+
+func TestCreateFunction(t *testing.T) {
+	t.Parallel()
+
+	db, err := sqlite3.Open(":memory:")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+
+	err = db.CreateFunction("test", 1, sqlite3.INNOCUOUS, func(ctx sqlite3.Context, arg ...sqlite3.Value) {
+		switch arg := arg[0]; arg.Int() {
+		case 0:
+			ctx.ResultInt(arg.Int())
+		case 1:
+			ctx.ResultInt64(arg.Int64())
+		case 2:
+			ctx.ResultBool(arg.Bool())
+		case 3:
+			ctx.ResultFloat(arg.Float())
+		case 4:
+			ctx.ResultText(arg.Text())
+		case 5:
+			ctx.ResultBlob(arg.Blob(nil))
+		case 6:
+			ctx.ResultZeroBlob(arg.Int64())
+		case 7:
+			ctx.ResultTime(arg.Time(sqlite3.TimeFormatUnix), sqlite3.TimeFormatDefault)
+		case 8:
+			var v any
+			if err := arg.JSON(&v); err != nil {
+				ctx.ResultError(err)
+			} else {
+				ctx.ResultJSON(v)
+			}
+		case 9:
+			ctx.ResultValue(arg)
+		case 10:
+			ctx.ResultNull()
+		case 11:
+			ctx.ResultError(sqlite3.FULL)
+		}
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	stmt, _, err := db.Prepare(`SELECT test(value) FROM generate_series(0)`)
+	if err != nil {
+		t.Error(err)
+	}
+	defer stmt.Close()
+
+	if stmt.Step() {
+		if got := stmt.ColumnType(0); got != sqlite3.INTEGER {
+			t.Errorf("got %v, want INTEGER", got)
+		}
+		if got := stmt.ColumnInt(0); got != 0 {
+			t.Errorf("got %v, want 1", got)
+		}
+	}
+
+	if stmt.Step() {
+		if got := stmt.ColumnType(0); got != sqlite3.INTEGER {
+			t.Errorf("got %v, want INTEGER", got)
+		}
+		if got := stmt.ColumnInt64(0); got != 1 {
+			t.Errorf("got %v, want 2", got)
+		}
+	}
+
+	if stmt.Step() {
+		if got := stmt.ColumnType(0); got != sqlite3.INTEGER {
+			t.Errorf("got %v, want INTEGER", got)
+		}
+		if got := stmt.ColumnBool(0); got != true {
+			t.Errorf("got %v, want true", got)
+		}
+	}
+
+	if stmt.Step() {
+		if got := stmt.ColumnType(0); got != sqlite3.FLOAT {
+			t.Errorf("got %v, want FLOAT", got)
+		}
+		if got := stmt.ColumnInt64(0); got != 3 {
+			t.Errorf("got %v, want 3", got)
+		}
+	}
+
+	if stmt.Step() {
+		if got := stmt.ColumnType(0); got != sqlite3.TEXT {
+			t.Errorf("got %v, want TEXT", got)
+		}
+		if got := stmt.ColumnText(0); got != "4" {
+			t.Errorf("got %s, want 4", got)
+		}
+	}
+
+	if stmt.Step() {
+		if got := stmt.ColumnType(0); got != sqlite3.BLOB {
+			t.Errorf("got %v, want BLOB", got)
+		}
+		if got := stmt.ColumnRawBlob(0); string(got) != "5" {
+			t.Errorf("got %s, want 5", got)
+		}
+	}
+
+	if stmt.Step() {
+		if got := stmt.ColumnType(0); got != sqlite3.BLOB {
+			t.Errorf("got %v, want BLOB", got)
+		}
+		if got := stmt.ColumnRawBlob(0); len(got) != 6 {
+			t.Errorf("got %v, want 6", got)
+		}
+	}
+
+	if stmt.Step() {
+		if got := stmt.ColumnType(0); got != sqlite3.TEXT {
+			t.Errorf("got %v, want TEXT", got)
+		}
+		if got := stmt.ColumnTime(0, sqlite3.TimeFormatAuto); got.Unix() != 7 {
+			t.Errorf("got %v, want 7", got)
+		}
+	}
+
+	if stmt.Step() {
+		if got := stmt.ColumnType(0); got != sqlite3.TEXT {
+			t.Errorf("got %v, want TEXT", got)
+		}
+		var got int
+		if err := stmt.ColumnJSON(0, &got); err != nil {
+			t.Error(err)
+		} else if got != 8 {
+			t.Errorf("got %v, want 8", got)
+		}
+	}
+
+	if stmt.Step() {
+		if got := stmt.ColumnType(0); got != sqlite3.INTEGER {
+			t.Errorf("got %v, want INTEGER", got)
+		}
+		if got := stmt.ColumnInt64(0); got != 9 {
+			t.Errorf("got %v, want 9", got)
+		}
+	}
+
+	if stmt.Step() {
+		if got := stmt.ColumnType(0); got != sqlite3.NULL {
+			t.Errorf("got %v, want NULL", got)
+		}
+	}
+
+	if stmt.Step() {
+		t.Error("want error")
+	}
+	if err := stmt.Err(); !errors.Is(err, sqlite3.FULL) {
+		t.Errorf("got %v, want sqlite3.FULL", err)
+	}
+}
+
+func TestAnyCollationNeeded(t *testing.T) {
+	t.Parallel()
+
+	db, err := sqlite3.Open(":memory:")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+
+	err = db.Exec(`CREATE TABLE IF NOT EXISTS users (id INT, name VARCHAR(10))`)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = db.Exec(`INSERT INTO users (id, name) VALUES (0, 'go'), (1, 'zig'), (2, 'whatever')`)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	db.AnyCollationNeeded()
+
+	stmt, _, err := db.Prepare(`SELECT id, name FROM users ORDER BY name COLLATE silly`)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer stmt.Close()
+
+	row := 0
+	ids := []int{0, 2, 1}
+	names := []string{"go", "whatever", "zig"}
+	for ; stmt.Step(); row++ {
+		id := stmt.ColumnInt(0)
+		name := stmt.ColumnText(1)
+
+		if id != ids[row] {
+			t.Errorf("got %d, want %d", id, ids[row])
+		}
+		if name != names[row] {
+			t.Errorf("got %q, want %q", name, names[row])
+		}
+	}
+	if row != 3 {
+		t.Errorf("got %d, want %d", row, len(ids))
+	}
+
+	if err := stmt.Err(); err != nil {
+		t.Fatal(err)
+	}
+}