iphone: core data(database) storage

In constant.m

NSString *const kEntityNameUser = @"User";

In constant.h

extern NSString *const kEntityNameUser;

In manager file

- (void)createNewUser :(NSString *)username

                      :(NSString *)password

                      

{

    

    User *newUser = [NSEntityDescription insertNewObjectForEntityForName:kEntityNameUser inManagedObjectContext:self.context];

  

       newUser.username=username;

    newUser.password=password;

    

    [self save];

}

-(void)save {

    NSError *error;

    [self.context save:&error];

}