Objective-C + CoreData + MySQL = EntityManagerMysql.h

This is one of my main private projects I'm currently working on. The goal is to use Apple's CoreData Framework and add MySQL as a persistent store. The end result is a static library for iPhone or a Cocoa framework for OS X. The current, rather basic implementation, has almost been finished. Next step is to support NSManagedObjectModel and NSManagedObjectContext to make this a full blown drop in replacement for Apple's current PersistentStoreType implementations. The current implementation is fully unit tested, works beautifully with read only operations and looks promising, but given my current time constrains I'm wondering if this side project will ever be finished...

A quick overview of the proposed protocol and interface.

[EntityManager.h]

@protocol EntityManager

- (NSArray *)findAll:(void (^)(struct NSError *))callbackClosure;
- (NSArray *)findByQuery:(NSString *)predicateQuery
            withCallback:(void (^)(struct NSError *))callbackClosure;
- (void)printAll:(void (^)(struct NSError *))callbackClosure;
- (void)removeAll:(void (^)(struct NSError *))callbackClosure;
- (void)updateByDictionary:(NSDictionary *)entityByDictionary
              withCallback:(void (^)(struct NSError *))callbackClosure;
- (void)removeByDictionary:(NSDictionary *)entityByDictionary
              withCallback:(void (^)(struct NSError *))callbackClosure;
- (void)insertByDictionary:(NSDictionary *)entityByDictionary
              withCallback:(void (^)(struct NSError *))callbackClosure;

@end
      

[EntityManagerMysql.h]

@interface EntityManagerMysql : NSObject<EntityManager> {

 - (id)initConnectionAtServer:(NSString *)server 
                     withUser:(NSString *)user
                 withPassword:(NSString *)password
                 withDatabase:(NSString *)database
             withOptionalPort:(int)port; 
 @end