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ADD: PRAGMA writable_schema

This commit is contained in:
Gert-Jan Timmer 2018-05-29 14:01:33 +02:00
parent cb041405c6
commit 24cbd402e4
2 changed files with 36 additions and 4 deletions
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1
README.md
View File

@ -92,6 +92,7 @@ Boolean values can be one of:
| 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) |
| Time Zone Location | `_loc` | auto | Specify location of time format. |
| Transaction Lock | `_txlock` | <ul><li>immediate</li><li>deferred</li><li>exclusive</li></ul> | Specify locking behavior for transactions. |
| 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. |
## DSN Examples

39
sqlite3.go
View File

@ -830,6 +830,11 @@ func errorString(err Error) string {
// Specify locking behavior for transactions. XXX can be "immediate",
// "deferred", "exclusive".
//
// _auto_vacuum=X | _vacuum=X
// 0 | none - Auto Vacuum disabled
// 1 | full - Auto Vacuum FULL
// 2 | incremental - Auto Vacuum Incremental
//
// _busy_timeout=XXX"| _timeout=XXX
// Specify value for sqlite3_busy_timeout.
//
@ -870,10 +875,12 @@ func errorString(err Error) string {
// Change the setting of the "synchronous" flag.
// https://www.sqlite.org/pragma.html#pragma_synchronous
//
// _vacuum=X
// 0 | none - Auto Vacuum disabled
// 1 | full - Auto Vacuum FULL
// 2 | incremental - Auto Vacuum Incremental
// _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.
//
//
func (d *SQLiteDriver) Open(dsn string) (driver.Conn, error) {
if C.sqlite3_threadsafe() == 0 {
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) {
recursiveTriggers := -1
secureDelete := "DEFAULT"
synchronousMode := "NORMAL"
writableSchema := -1
pos := strings.IndexRune(dsn, '?')
if pos >= 1 {
@ -1162,6 +1170,21 @@ func (d *SQLiteDriver) Open(dsn string) (driver.Conn, error) {
}
}
// Writable Schema (_writeable_schema)
//
// https://www.sqlite.org/pragma.html#pragma_writeable_schema
//
if val := params.Get("_writable_schema"); val != "" {
switch strings.ToLower(val) {
case "0", "no", "false", "off":
writableSchema = 0
case "1", "yes", "true", "on":
writableSchema = 1
default:
return nil, fmt.Errorf("Invalid _writable_schema: %v, expecting boolean value of '0 1 false true no yes off on'", val)
}
}
if !strings.HasPrefix(dsn, "file:") {
dsn = dsn[:pos]
}
@ -1287,6 +1310,14 @@ func (d *SQLiteDriver) Open(dsn string) (driver.Conn, error) {
return nil, err
}
// Writable Schema
if writableSchema > -1 {
if err := exec(fmt.Sprintf("PRAGMA writable_schema = %d;", writableSchema)); err != nil {
C.sqlite3_close_v2(db)
return nil, err
}
}
conn := &SQLiteConn{db: db, loc: loc, txlock: txlock}
if len(d.Extensions) > 0 {