Links for Core Data Entity Class, ManagedObjectID & Relationships

Links for Core Data Entity Class, ManagedObjectID & Relationships...

coredata entity class..

1. https://code.tutsplus.com/tutorials/core-data-from-scratch-subclassing-nsmanagedobject--cms-21880

       2.  http://nscookbook.com/2014/03/recipe-33-relational-data-handling-with-core-data/

RelationShips..

      3.  http://christianroman.net/core-data-and-mantle-one-to-many-relationship/

       4.  https://www.packtpub.com/books/content/guide-understanding-core-data-ios

      5.  http://www.techotopia.com/index.php/Working_with_iOS_7_Databases_using_Core_Data

      6.  http://www.techotopia.com/index.php/An_iOS_7_Core_Data_Tutorial

Core Data XCode8.0 & later, ios 10.0 & later version...

Core Data Xcode 8.0 & later, ios 10.0 & later version ...

@property AppDelegate *appDelg;

@property NSEntityDescription *enterTextED;

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view.

    

   _appDelg = (AppDelegate *)[[UIApplication sharedApplication]delegate];

   _enterTextED = [NSEntityDescription entityForName:@"Data" inManagedObjectContext:_appDelg.persistentContainer.viewContext];

}

// To Save Data

-(void) SaveData {

 _appDelg = (AppDelegate *)[[UIApplication sharedApplication]delegate];

   _enterTextED = [NSEntityDescription entityForName:@"Data" inManagedObjectContext:_appDelg.persistentContainer.viewContext];

 NSManagedObject *managedObject = [[NSManagedObject alloc]initWithEntity:_enterTextED insertIntoManagedObjectContext:_appDelg.persistentContainer.viewContext];

        [managedObject setValue:_enterTextTF.text forKey:@"enterText"];

        

    NSError *errorObj;

    [_appDelg.persistentContainer.viewContext save:&errorObj];

}

// To Fetch Data

-(void) FetchData {

_appDelg = (AppDelegate *)[[UIApplication sharedApplication]delegate];

    

    NSFetchRequest * fetchReq = [NSFetchRequest fetchRequestWithEntityName:@"Data"];

    NSError * fetchErrorObj;

    storedData = [_appDelg.persistentContainer.viewContext executeFetchRequest:fetchReq error:&fetchErrorObj];

    NSLog(@"array count is %lu",storedData.count);

}

Core Data Xcode below 8.0 Version Save & Fetch

Core Data Xcode below 8.0 Version Save & Fetch...

@property AppDelegate *appDelg;

@property NSEntityDescription *namesED;

@implementation enterDataViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view.

    self.appDelg = (AppDelegate *)[[UIApplication sharedApplication]delegate];

    self.namesED = [NSEntityDescription entityForName:@"Name" inManagedObjectContext:self.appDelg.managedObjectContext];

}

- (void)saveData {

    

    NSManagedObject *managedObject = [[NSManagedObject alloc]initWithEntity:self.namesED insertIntoManagedObjectContext:self.appDelg.managedObjectContext];

    [managedObject setValue:self.enterText.text forKey:@"enterName"];

    

    NSError *errorObj;

    [self.appDelg.managedObjectContext save:&errorObj];

    

    if (errorObj) {

        UIAlertController *alertCon = [UIAlertController alertControllerWithTitle:@"Error" message:@"Error Occured" preferredStyle:UIAlertControllerStyleAlert];

        UIAlertAction *alertAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:nil];

        [alertCon addAction:alertAction];

    }

    else {

        NSLog(@"Saved successfully..");

    }

    TableViewController *viewC = [self.storyboard instantiateViewControllerWithIdentifier:@"TableViewControllerID"];

    [self.navigationController pushViewController:viewC animated:YES];

}

- (IBAction)getStoredData:(id)sender

{

    

    NSFetchRequest * fetReq = [NSFetchRequest fetchRequestWithEntityName:@"Name"];

    

    NSError * fetchErrorObj;

    NSArray * storedData = [self.appDelg.managedObjectContext executeFetchRequest:fetReq error:&fetchErrorObj];

    NSLog(@"array count is %lu",storedData.count);

    

    for (int i=0; i<storedData.count; i++)

    {

        NSManagedObject * storedManagedObj = [storedData objectAtIndex:i];

        

        if ([[storedManagedObj valueForKey:@"enterName"] isEqualToString:self.enterText.text]) {

            NSLog(@"enterName is %@",[storedManagedObj valueForKey:@"enterName"]);

            

            NSString *savedDataStr = [storedManagedObj valueForKey:@"enterName"];

            _savedDataLbl.text = savedDataStr;

            

            NSMutableArray *array = [NSMutableArray array];

            for (int i = 0; i < [savedDataStr length]; i++) {

                NSString *ch = [savedDataStr substringWithRange:NSMakeRange(i, 1)];

                [array addObject:ch];

                

            }

            NSLog(@"arr -- %@",array);

        }

    }

 }

@end

Updating the Existed Entities And Attributes Core Data in Xcode below 8.0 and Xcode 8.0 & Later versions

Updating the Existed Core Data in Xcode below 8.0...

NSFetchRequest *request = [[NSFetchRequest alloc] init];
NSEntityDescription *sysCounters = [NSEntityDescription entityForName:@ProfileinManagedObjectContext:managedObjectContext];
[request setEntity:sysCounters];

NSPredicate *predicate = [NSPredicate predicateWithFormat:@(p_roomName = %@)",editProfileForString];
[request setPredicate:predicate];

NSError *error = nil;
NSArray *results = [managedObjectContext executeFetchRequest:request error:&error];
for (NSManagedObject *obj in results) {
[obj setValue:txtfDescription.text forKey:@p_description];
[obj setValue:txtfRoomName.text forKey:@p_roomName];
[obj setValue:txtfIp.text forKey:@p_ip];
[obj setValue:txtfPort.text forKey:@p_port];
[obj setValue:txtfUsername.text forKey:@p_username];
[obj setValue:txtfPassword.text forKey:@p_password];
[managedObjectContext save:&error];
}



//Updating the ExistedCore Data in Xcode 8.0 & Later versions

NSFetchRequest *request = [[NSFetchRequest alloc] init];

NSEntityDescription *data = [NSEntityDescription entityForName:@"Data" inManagedObjectContext:_appDelg.persistentContainer.viewContext];

    [request setEntity:data];

    

    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(enterText = %@)",beforeUpdateString];

    [request setPredicate:predicate];

                              

    NSError *error = nil;

    NSArray *results = [_appDelg.persistentContainer.viewContext executeFetchRequest:request error:&error];

    for (NSManagedObject *tempObj in results) {

     [tempObj setValue:_editablePositionString forKey:@"enterText"];

                                  

//   [obj setValue:txtfRoomName.text forKey:@p_roomName];

//   [obj setValue:txtfIp.text forKey:@p_ip];

//   [obj setValue:txtfPort.text forKey:@p_port];

//   [obj setValue:txtfUsername.text forKey:@p_username];

//   [obj setValue:txtfPassword.text forKey:@p_password];

                                  

    [_appDelg.persistentContainer.viewContext save:&error];

       

  }