Fix JSON.

driver/driver.go

@@ -30,7 +30,6 @@ import (
 	"context"
 	"database/sql"
 	"database/sql/driver"
-	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
@@ -386,12 +385,12 @@ func (s *stmt) setupBindings(args []driver.NamedValue) error {
 				err = s.Stmt.BindBlob(id, a)
 			case sqlite3.ZeroBlob:
 				err = s.Stmt.BindZeroBlob(id, int64(a))
-			case interface{ Value() any }:
-				err = s.Stmt.BindPointer(id, a.Value())
 			case time.Time:
 				err = s.Stmt.BindTime(id, a, sqlite3.TimeFormatDefault)
-			case json.Marshaler:
-				err = s.Stmt.BindJSON(id, a)
+			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:
@@ -408,8 +407,10 @@ func (s *stmt) setupBindings(args []driver.NamedValue) error {
 func (s *stmt) CheckNamedValue(arg *driver.NamedValue) error {
 	switch arg.Value.(type) {
 	case bool, int, int64, float64, string, []byte,
-		sqlite3.ZeroBlob, interface{ Value() any },
-		time.Time, json.Marshaler, nil:
+		sqlite3.ZeroBlob, time.Time,
+		interface{ Pointer() any },
+		interface{ JSON() any },
+		nil:
 		return nil
 	default:
 		return driver.ErrSkip

json.go

@@ -9,26 +9,16 @@ import (
 	"github.com/ncruces/go-sqlite3/internal/util"
 )
 
-// JSON returns:
-// a [json.Marshaler] that can be used as an argument to
-// [database/sql.DB.Exec] and similar methods to
-// store value as JSON; and
-// a [database/sql.Scanner] that can be used as an argument to
-// [database/sql.Row.Scan] and similar methods to
-// decode JSON into value.
+// 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) MarshalJSON() ([]byte, error) {
-	return json.Marshal(j.any)
-}
-
-func (j jsonValue) UnmarshalJSON(data []byte) error {
-	return json.Unmarshal(data, j.any)
-}
+func (j jsonValue) JSON() any { return j.any }
 
 func (j jsonValue) Scan(value any) error {
 	var buf []byte
@@ -52,5 +42,5 @@ func (j jsonValue) Scan(value any) error {
 		panic(util.AssertErr())
 	}
 
-	return j.UnmarshalJSON(buf)
+	return json.Unmarshal(buf, j.any)
 }

pointer.go

@@ -11,4 +11,4 @@ func Pointer[T any](val T) any {
 
 type pointer[T any] struct{ val T }
 
-func (p pointer[T]) Value() any { return p.val }
+func (p pointer[T]) Pointer() any { return p.val }