mirror of
https://github.com/ncruces/go-sqlite3.git
synced 2026-01-12 05:59:14 +00:00
Refactor.
This commit is contained in:
Nuno Cruces
224
conn.go
224
conn.go
@@ -2,7 +2,9 @@ package sqlite3
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import (
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"context"
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"fmt"
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"math"
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"runtime"
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)
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// Conn is a database connection handle.
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@@ -91,6 +93,64 @@ func (c *Conn) Close() error {
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return c.mem.mod.Close(c.ctx)
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}
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// Exec is a convenience function that allows an application to run
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// multiple statements of SQL without having to use a lot of code.
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//
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// https://www.sqlite.org/c3ref/exec.html
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func (c *Conn) Exec(sql string) error {
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c.checkInterrupt()
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defer c.arena.reset()
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sqlPtr := c.arena.string(sql)
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r, err := c.api.exec.Call(c.ctx, uint64(c.handle), uint64(sqlPtr), 0, 0, 0)
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if err != nil {
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panic(err)
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}
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return c.error(r[0])
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}
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// Prepare calls [Conn.PrepareFlags] with no flags.
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func (c *Conn) Prepare(sql string) (stmt *Stmt, tail string, err error) {
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return c.PrepareFlags(sql, 0)
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}
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// PrepareFlags compiles the first SQL statement in sql;
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// tail is left pointing to what remains uncompiled.
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// If the input text contains no SQL (if the input is an empty string or a comment),
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// both stmt and err will be nil.
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//
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// https://www.sqlite.org/c3ref/prepare.html
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func (c *Conn) PrepareFlags(sql string, flags PrepareFlag) (stmt *Stmt, tail string, err error) {
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if emptyStatement(sql) {
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return nil, "", nil
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}
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defer c.arena.reset()
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stmtPtr := c.arena.new(ptrlen)
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tailPtr := c.arena.new(ptrlen)
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sqlPtr := c.arena.string(sql)
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r, err := c.api.prepare.Call(c.ctx, uint64(c.handle),
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uint64(sqlPtr), uint64(len(sql)+1), uint64(flags),
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uint64(stmtPtr), uint64(tailPtr))
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if err != nil {
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panic(err)
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}
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stmt = &Stmt{c: c}
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stmt.handle = c.mem.readUint32(stmtPtr)
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i := c.mem.readUint32(tailPtr)
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tail = sql[i-sqlPtr:]
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if err := c.error(r[0], sql); err != nil {
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return nil, "", err
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}
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if stmt.handle == 0 {
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return nil, "", nil
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}
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return
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}
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// GetAutocommit tests the connection for auto-commit mode.
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//
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// https://www.sqlite.org/c3ref/get_autocommit.html
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@@ -102,6 +162,31 @@ func (c *Conn) GetAutocommit() bool {
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return r[0] != 0
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}
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// LastInsertRowID returns the rowid of the most recent successful INSERT
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// on the database connection.
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//
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// https://www.sqlite.org/c3ref/last_insert_rowid.html
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func (c *Conn) LastInsertRowID() uint64 {
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r, err := c.api.lastRowid.Call(c.ctx, uint64(c.handle))
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if err != nil {
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panic(err)
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}
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return r[0]
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}
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// Changes returns the number of rows modified, inserted or deleted
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// by the most recently completed INSERT, UPDATE or DELETE statement
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// on the database connection.
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//
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// https://www.sqlite.org/c3ref/changes.html
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func (c *Conn) Changes() uint64 {
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r, err := c.api.changes.Call(c.ctx, uint64(c.handle))
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if err != nil {
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panic(err)
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}
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return r[0]
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}
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// SetInterrupt interrupts a long-running query when a context is done.
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//
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// Subsequent uses of the connection will return [INTERRUPT]
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@@ -187,87 +272,74 @@ func (c *Conn) checkInterrupt() bool {
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return true
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}
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// Exec is a convenience function that allows an application to run
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// multiple statements of SQL without having to use a lot of code.
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// Savepoint creates a named SQLite transaction using SAVEPOINT.
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//
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// https://www.sqlite.org/c3ref/exec.html
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func (c *Conn) Exec(sql string) error {
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c.checkInterrupt()
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defer c.arena.reset()
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sqlPtr := c.arena.string(sql)
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r, err := c.api.exec.Call(c.ctx, uint64(c.handle), uint64(sqlPtr), 0, 0, 0)
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if err != nil {
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panic(err)
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}
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return c.error(r[0])
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}
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// Prepare calls [Conn.PrepareFlags] with no flags.
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func (c *Conn) Prepare(sql string) (stmt *Stmt, tail string, err error) {
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return c.PrepareFlags(sql, 0)
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}
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// PrepareFlags compiles the first SQL statement in sql;
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// tail is left pointing to what remains uncompiled.
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// If the input text contains no SQL (if the input is an empty string or a comment),
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// both stmt and err will be nil.
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// On success Savepoint returns a release func that will call
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// either RELEASE or ROLLBACK depending on whether the parameter *error
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// points to a nil or non-nil error.
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//
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// https://www.sqlite.org/c3ref/prepare.html
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func (c *Conn) PrepareFlags(sql string, flags PrepareFlag) (stmt *Stmt, tail string, err error) {
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if emptyStatement(sql) {
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return nil, "", nil
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}
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defer c.arena.reset()
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stmtPtr := c.arena.new(ptrlen)
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tailPtr := c.arena.new(ptrlen)
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sqlPtr := c.arena.string(sql)
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r, err := c.api.prepare.Call(c.ctx, uint64(c.handle),
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uint64(sqlPtr), uint64(len(sql)+1), uint64(flags),
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uint64(stmtPtr), uint64(tailPtr))
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if err != nil {
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panic(err)
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}
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stmt = &Stmt{c: c}
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stmt.handle = c.mem.readUint32(stmtPtr)
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i := c.mem.readUint32(tailPtr)
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tail = sql[i-sqlPtr:]
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if err := c.error(r[0], sql); err != nil {
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return nil, "", err
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}
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if stmt.handle == 0 {
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return nil, "", nil
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}
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return
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}
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// LastInsertRowID returns the rowid of the most recent successful INSERT
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// on the database connection.
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// This is meant to be deferred:
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//
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// https://www.sqlite.org/c3ref/last_insert_rowid.html
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func (c *Conn) LastInsertRowID() uint64 {
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r, err := c.api.lastRowid.Call(c.ctx, uint64(c.handle))
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if err != nil {
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panic(err)
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}
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return r[0]
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}
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// Changes returns the number of rows modified, inserted or deleted
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// by the most recently completed INSERT, UPDATE or DELETE statement
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// on the database connection.
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// func doWork(conn *sqlite3.Conn) (err error) {
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// defer conn.Savepoint()(&err)
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//
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// https://www.sqlite.org/c3ref/changes.html
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func (c *Conn) Changes() uint64 {
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r, err := c.api.changes.Call(c.ctx, uint64(c.handle))
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if err != nil {
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panic(err)
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// // ... do work in the transaction
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// }
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func (conn *Conn) Savepoint() (release func(*error)) {
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name := "sqlite3.Savepoint" // names can be reused
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var pc [1]uintptr
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if n := runtime.Callers(2, pc[:]); n > 0 {
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frames := runtime.CallersFrames(pc[:n])
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frame, _ := frames.Next()
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if frame.Function != "" {
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name = frame.Function
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}
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}
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err := conn.Exec(fmt.Sprintf("SAVEPOINT %q;", name))
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if err != nil {
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return func(errp *error) {
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if *errp == nil {
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*errp = err
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}
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}
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}
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return func(errp *error) {
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recovered := recover()
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if recovered != nil {
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defer panic(recovered)
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}
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if conn.GetAutocommit() {
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// There is nothing to commit/rollback.
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return
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}
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if *errp == nil && recovered == nil {
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// Success path.
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// RELEASE the savepoint successfully.
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*errp = conn.Exec(fmt.Sprintf("RELEASE %q;", name))
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if *errp == nil {
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return
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}
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// Possible interrupt, fall through to the error path.
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}
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// Error path.
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// Always ROLLBACK even if the connection has been interrupted.
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old := conn.SetInterrupt(context.Background())
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defer conn.SetInterrupt(old)
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err := conn.Exec(fmt.Sprintf("ROLLBACK TO %q;", name))
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if err != nil {
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panic(err)
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}
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err = conn.Exec(fmt.Sprintf("RELEASE %q;", name))
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if err != nil {
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panic(err)
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}
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}
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return r[0]
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}
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func (c *Conn) error(rc uint64, sql ...string) error {
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