核心数据错误：在持久存储协调器中获取错误的最常见错误是哪些？

Question

enter code hereIn my Application I am using Sqlite as an externel data base. So, Please Reply.I am using Xcode finding defficult to communicate to the sqlite file and Managed Object Model..


    enter code here



- (NSPersistentStoreCoordinator *)persistentStoreCoordinator
{
    if (__persistentStoreCoordinator != nil)
    {
        return __persistentStoreCoordinator;
    }

    NSURL *storeURL=[[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"CoreDataBountyHunter.sqlite"];

    NSError *error = nil;
    __persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
    if (![__persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error])
    {

  //     
         Typical reasons for an error here include:
         * The persistent store is not accessible;
         * The schema for the persistent store is incompatible with current managed object model.


        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        abort();
    }    

    return __persistentStoreCoordinator;
}

Answer 1

除非您实现自己的商店，否则Core Data不适用于外部SQLite数据库。如果您需要具有预定义模式的外部数据库，则不要尝试将Core Data纳入您的解决方案。而是使用标准C API与您的SQLite数据库进行通信。