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Commit 24cbd40

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ADD: PRAGMA writable_schema
1 parent cb04140 commit 24cbd40

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2 files changed

+36
-4
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2 files changed

+36
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‎README.md‎

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@@ -92,6 +92,7 @@ Boolean values can be one of:
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| Synchronous | `_synchronous` \| `_sync` | <ul><li>0 \| OFF</li><li>1 \| NORMAL</li><li>2 \| FULL</li><li>3 \| EXTRA</li></ul> | For more information see [PRAGMA synchronous](https://www.sqlite.org/pragma.html#pragma_synchronous) |
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| Time Zone Location | `_loc` | auto | Specify location of time format. |
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| Transaction Lock | `_txlock` | <ul><li>immediate</li><li>deferred</li><li>exclusive</li></ul> | Specify locking behavior for transactions. |
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| Writable Schema | `_writable_schema` | `Boolean` | When this pragma is on, the SQLITE_MASTER tables in which database can be changed using ordinary UPDATE, INSERT, and DELETE statements. Warning: misuse of this pragma can easily result in a corrupt database file. |
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## DSN Examples
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‎sqlite3.go‎

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@@ -830,6 +830,11 @@ func errorString(err Error) string {
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// Specify locking behavior for transactions. XXX can be "immediate",
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// "deferred", "exclusive".
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//
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// _auto_vacuum=X | _vacuum=X
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// 0 | none - Auto Vacuum disabled
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// 1 | full - Auto Vacuum FULL
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// 2 | incremental - Auto Vacuum Incremental
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//
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// _busy_timeout=XXX"| _timeout=XXX
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// Specify value for sqlite3_busy_timeout.
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//
@@ -870,10 +875,12 @@ func errorString(err Error) string {
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// Change the setting of the "synchronous" flag.
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// https://www.sqlite.org/pragma.html#pragma_synchronous
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//
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// _vacuum=X
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// 0 | none - Auto Vacuum disabled
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// 1 | full - Auto Vacuum FULL
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// 2 | incremental - Auto Vacuum Incremental
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// _writable_schema=Boolean
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// When this pragma is on, the SQLITE_MASTER tables in which database
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// can be changed using ordinary UPDATE, INSERT, and DELETE statements.
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// Warning: misuse of this pragma can easily result in a corrupt database file.
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//
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//
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func (d *SQLiteDriver) Open(dsn string) (driver.Conn, error) {
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if C.sqlite3_threadsafe() == 0 {
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return nil, errors.New("sqlite library was not compiled for thread-safe operation")
@@ -899,6 +906,7 @@ func (d *SQLiteDriver) Open(dsn string) (driver.Conn, error) {
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recursiveTriggers := -1
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secureDelete := "DEFAULT"
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synchronousMode := "NORMAL"
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writableSchema := -1
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pos := strings.IndexRune(dsn, '?')
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if pos >= 1 {
@@ -1162,6 +1170,21 @@ func (d *SQLiteDriver) Open(dsn string) (driver.Conn, error) {
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}
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}
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// Writable Schema (_writeable_schema)
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//
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// https://www.sqlite.org/pragma.html#pragma_writeable_schema
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//
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if val := params.Get("_writable_schema"); val != "" {
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switch strings.ToLower(val) {
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case "0", "no", "false", "off":
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writableSchema = 0
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case "1", "yes", "true", "on":
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writableSchema = 1
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default:
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return nil, fmt.Errorf("Invalid _writable_schema: %v, expecting boolean value of '0 1 false true no yes off on'", val)
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}
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}
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if !strings.HasPrefix(dsn, "file:") {
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dsn = dsn[:pos]
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}
@@ -1287,6 +1310,14 @@ func (d *SQLiteDriver) Open(dsn string) (driver.Conn, error) {
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return nil, err
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}
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// Writable Schema
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if writableSchema > -1 {
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if err := exec(fmt.Sprintf("PRAGMA writable_schema = %d;", writableSchema)); err != nil {
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C.sqlite3_close_v2(db)
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return nil, err
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}
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}
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conn := &SQLiteConn{db: db, loc: loc, txlock: txlock}
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if len(d.Extensions) > 0 {

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