https://developer.apple.com/library/ios/releasenotes/DataManagement/WhatsNew_CoreData_iOS/
I am having trouble in disabling journal mode.
My code is:
static NSManagedObjectContext *managedObjectContext(){
static NSManagedObjectContext *context = nil;
if (context != nil) {
return context;
}
NSString * const NSSQLitePragmasOption;
NSSQLitePragmasOption : @{ @"journal_mode" : @"DELETE" };
@autoreleasepool {
context = [[NSManagedObjectContext alloc] init];
NSPersistentStoreCoordinator *coordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:managedObjectModel()];
[context setPersistentStoreCoordinator:coordinator];
NSString *STORE_TYPE = NSSQLiteStoreType;
NSString *path = @"ExerciseDB";
NSURL *url = [NSURL fileURLWithPath:[path stringByAppendingPathExtension:@"sqlite"]];
NSError *error;
NSPersistentStore *newStore = [coordinator addPersistentStoreWithType:STORE_TYPE configuration:nil URL:url options:NSSQLitePragmasOption error:&error];
if (newStore == nil) {
NSLog(@"Store Configuration Failure %@", ([error localizedDescription] != nil) ? [error localizedDescription] : @"Unknown Error");
}
}
return context;
}
How would I go about disabling journal mode WAL.
Thanks
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()
}
来源:https://stackoverflow.com/questions/20062197/how-to-disable-wal-journal-mode