How to disable WAL journal mode

亡梦爱人 提交于 2019-11-27 01:59:41

To disable WAL mode, set the journal_mode to DELETE

NSMutableDictionary *pragmaOptions = [NSMutableDictionary dictionary];
[pragmaOptions setObject:@"DELETE" forKey:@"journal_mode"];

NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption, [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, pragmaOptions, NSSQLitePragmasOption, nil];
[_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:options error:&error]

From Apple Technical Documentation: Technical Q&A QA1809

NSDictionary *options = @{NSSQLitePragmasOption:@{@"journal_mode":@"DELETE"}};
if (! [persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType
                                            configuration:nil
                                            URL:storeURL
                                            options:options
                                            error:&error]) {
    // error handling.
}

For Swift 2 it would be the following:

    let dict: [NSObject : AnyObject] = [
        NSSQLitePragmasOption: ["journal_mode":"DELETE"]
    ]

    do {
        try coordinator.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: url, options: dict)
    } catch {
        // Report any error we got.
        var dict = [String: AnyObject]()
        dict[NSLocalizedDescriptionKey] = "Failed to initialize the application's saved data"
        dict[NSLocalizedFailureReasonErrorKey] = failureReason

        dict[NSUnderlyingErrorKey] = error as! NSError
        let wrappedError = NSError(domain: "YOUR_ERROR_DOMAIN", code: 9999, userInfo: dict)
        // Replace this with code to handle the error appropriately.
        // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
        NSLog("Unresolved error \(wrappedError), \(wrappedError.userInfo)")
        abort()
    }
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