swift2.0 + Xcode7
CoreData中的Request
－ 普通的NSFetchRequest
－ 异步的NSAsynchronousFetchRequest
－ 批量的NSBatchUpdateRequest
resulteType
• NSManagedObjectResultType: Returns managed objects (default value).
• NSCountResultType: Returns the count of the objects that match the fetch request.
• NSDictionaryResultType: This is a catch-all return type for returning the results of different calculations.
• NSManagedObjectIDResultType: Returns unique identifiers instead of full- fledged managed objects.
context－ConcurrencyType
NSManagedObjectContextConcurrencyType.ConfinementConcurrencyType // 默认
NSManagedObjectContextConcurrencyType.PrivateQueueConcurrencyType // 多线程
NSManagedObjectContextConcurrencyType.MainQueueConcurrencyType // 主线程并发