Làm thế nào để lấy tất cả các bản ghi Từ CoreData Base bằng NSManagedObjectSubClass?

Question

Tôi cố gắng để thực hiện CoreData trong ios Application, Bây giờ tôi muốn Fetch tất cả hồ sơ từ Entity MUSTHAFA

My NSManagedObjectedSubClass is MUSTAHFA 

MUSTHAFA.m

#import <Foundation/Foundation.h> 
#import <CoreData/CoreData.h> 

@interface MUSTHAFA : NSManagedObject { 
@private 
} 
@property (nonatomic, retain) NSString * FirstName; 
@property (nonatomic, retain) NSNumber * Age; 
@property (nonatomic, retain) NSString * Location; 
@property (nonatomic, retain) NSString * LastName; 

@end 

#import "MUSTHAFA.h" 


@implementation MUSTHAFA 
@dynamic FirstName; 
@dynamic Age; 
@dynamic Location; 
@dynamic LastName; 

@end 

Thêm Records để Core Data

-(void)AddRecordToCoreData{ 

    //NSLog(@"______ ADD Core Data Implementaion"); 
    MUSTHAFA *event = (MUSTHAFA *)[NSEntityDescription insertNewObjectForEntityForName:@"MUSTHAFA" inManagedObjectContext:managedObjectContext]; 
    [event setLastName:@"JOHN"]; 
    [event setFirstName:@"JOSE "]; 
    [event setLocation:@"IDUKKI "]; 
    [event setAge:[NSNumber numberWithInt:25]];  
    NSError *error; 
    if (![managedObjectContext save:&error]) 
     {  
     NSLog(@"Error..%@",error); 
    } 
     else 
     { 
     NSLog(@"Data added to MUSTHAFA "); 
     }  
} 

Lấy tất cả các giá trị từ dữ liệu lõi giống như chọn * từ dbTable;

-(void)FetchRecordFromCoreData:(id)data1{ 

    //NSLog(@"______ Fetch Core Data Implementaion"); 
    MUSTHAFA *event = (MUSTHAFA *)[NSEntityDescription insertNewObjectForEntityForName:@"MUSTHAFA" inManagedObjectContext:managedObjectContext]; 

    //USING event how can fetch all record from Data base; 


} 

Sự kiện USING (Instance of MUSTAHFA) cách lấy tất cả bản ghi từ cơ sở dữ liệu?

Answer 1

NSManagedObjectContext *context = //Get it from AppDelegate 

NSFetchRequest *request = [[NSFetchRequest alloc]initWithEntityName:@"MUSTHAFA"]; 

NSError *error = nil; 

NSArray *results = [context executeFetchRequest:request error:&error]; 

if (error != nil) { 

    //Deal with failure 
} 
else { 

    //Deal with success 
} 

[request release]; 

Answer 2

AppDelegate *delegate = [UIApplication sharedApplication].delegate; 

NSManagedObjectContext *context =[delegate managedObjectContext]; 

NSFetchRequest *request = [[NSFetchRequest alloc]initWithEntityName:@"Channels"]; 

NSError *error = nil; 
NSArray *results = [context executeFetchRequest:request error:&error]; 

ChannelDBArray=[[NSMutableArray alloc]init]; 

for (NSManagedObject *obj in results) { 


    NSArray *keys = [[[obj entity] attributesByName] allKeys]; 
    NSDictionary *dictionary = [obj dictionaryWithValuesForKeys:keys]; 

} 
if (error != nil) { 

    //Deal with failure 
} 
else { 

    //Deal with success 
}