ADD: PRAGMA journal_mode

Author: gjrtimmer

README.md

@@ -80,6 +80,7 @@ Boolean values can be one of:
 | Defer Foreign Keys | `_defer_foreign_keys` \| `_defer_fk` | `boolean` | For more information see [PRAGMA defer_foreign_keys](https://www.sqlite.org/pragma.html#pragma_defer_foreign_keys) |
 | Foreign Keys | `_foreign_keys` \| `_fk` | `boolean` | For more information see [PRAGMA foreign_keys](https://www.sqlite.org/pragma.html#pragma_foreign_keys) |
 | Ignore CHECK Constraints | `_ignore_check_constraints` | `boolean` | For more information see [PRAGMA ignore_check_constraints](https://www.sqlite.org/pragma.html#pragma_ignore_check_constraints) |
+| Journal Mode | `_journal` | <ul><li>DELETE</li><li>TRUNCATE</li><li>PERSIST</li><li>MEMORY</li><li>WAL</li><li>OFF</li></ul> | For more information see [PRAGMA journal_mode](https://www.sqlite.org/pragma.html#pragma_journal_mode) |
 | Mode | `mode` | <ul><li>ro</li><li>rw</li><li>rwc</li><li>memory</li></ul> | Access Mode of the database. For more information see [SQLite Open](https://www.sqlite.org/c3ref/open.html) |
 | Mutex Locking | `_mutex` | <ul><li>no</li><li>full</li></ul> | Specify mutex mode. |
 | Recursive Triggers | `_recursive_triggers` \| `_rt` | `boolean` | For more information see [PRAGMA recursive_triggers](https://www.sqlite.org/pragma.html#pragma_recursive_triggers) |

sqlite3.go

@@ -838,6 +838,10 @@ func errorString(err Error) string {
 //     This pragma enables or disables the enforcement of CHECK constraints.
 //     The default setting is off, meaning that CHECK constraints are enforced by default.
 //
+//   _journal=MODE
+//     Set journal mode for the databases associated with the current connection.
+//     https://www.sqlite.org/pragma.html#pragma_journal_mode
+//
 //   _recursive_triggers=Boolean | _rt=Boolean
 //     Enable or disable recursive triggers.
 //
@@ -863,6 +867,7 @@ func (d *SQLiteDriver) Open(dsn string) (driver.Conn, error) {
 	caseSensitiveLike := -1
 	deferForeignKeys := -1
 	ignoreCheckConstraints := -1
+	journalMode := "DELETE"
 	foreignKeys := -1
 	recursiveTriggers := -1
 
@@ -1022,6 +1027,19 @@ func (d *SQLiteDriver) Open(dsn string) (driver.Conn, error) {
 			}
 		}
 
+		// Journal Mode (_journal)
+		//
+		// https://www.sqlite.org/pragma.html#pragma_journal_mode
+		//
+		if val := params.Get("_journal"); val != "" {
+			switch strings.ToUpper(val) {
+			case "DELETE", "TRUNCATE", "PERSIST", "MEMORY", "WAL", "OFF":
+				journalMode = strings.ToUpper(val)
+			default:
+				return nil, fmt.Errorf("Invalid _journal: %v, expecting value of 'DELETE TRUNCATE PERSIST MEMORY WAL OFF'", val)
+			}
+		}
+
 		// Recursive Triggers (_recursive_triggers)
 		//
 		// https://www.sqlite.org/pragma.html#pragma_recursive_triggers
@@ -1118,6 +1136,13 @@ func (d *SQLiteDriver) Open(dsn string) (driver.Conn, error) {
 		}
 	}
 
+	// Journal Mode
+	// Because default Journal Mode is DELETE this PRAGMA can always be executed.
+	if err := exec(fmt.Sprintf("PRAGMA journal_mode = %s;", journalMode)); err != nil {
+		C.sqlite3_close_v2(db)
+		return nil, err
+	}
+
 	// Recursive Triggers
 	if recursiveTriggers > -1 {
 		if err := exec(fmt.Sprintf("PRAGMA recursive_triggers = %d;", recursiveTriggers)); err != nil {