objective-c - español - core data swift 4

¿Cómo obtener todos los registros de CoreData Base utilizando NSManagedObjectSubClass?

Question

Estoy tratando de implementar CoreData en la aplicación ios , ahora quiero obtener todos los registros de la entidad 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

Agregar registros a datos básicos

-(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 ");
}
}

Recuperación de todos los valores de Core Data igual que select * from 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;
}

UTILIZANDO el evento (Instancia de MUSTAHFA) ¿cómo se puede recuperar todo el registro de la base de datos?

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
}