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2012-01-03T08:31:50.013
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2012-01-03T08:31:50.013
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I am doing a project which involved in Core Data, and I would like to share something with you about it. It is a clear that before you delete or update a record you need to retrieve that record. Use the employee with empId 12345 as an example, a)Delete <pre><code>NSFetchRequest *request = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@:@"Employee" inManagedObjectContext:self.managedObjectContext]; [request setEntity:entity]; NSPredicate *pred = [NSPredicate predicateWithFormat:[NSString stringWithFormat:@"empId = %d", 12345]]; [request setPredicate:pred]; NSArray *empArray=[self.managedObjectContext executeFetchRequest:request error:nil]; [request release]; if ([empArray count] > 0){ Employee *employee = [empArray objectAtIndex:0]; [self.managedObjectContext deleteObject:employee]; [self.managedObjectContext save:nil]; } </code></pre> b) update <pre><code>NSFetchRequest *request = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@:@"Employee" inManagedObjectContext:self.managedObjectContext]; [request setEntity:entity]; NSPredicate *pred = [NSPredicate predicateWithFormat:[NSString stringWithFormat:@"empId = %d", 12345]]; [request setPredicate:pred]; NSArray *empArray=[self.managedObjectContext executeFetchRequest:request error:nil]; [request release]; if ([empArray count] > 0){ Employee *employee = [empArray objectAtIndex:0]; employee.empSalary=[NSNumber numberWithInt:45000]; employee.empName=@"John"; employee.empDesignation=@"Analysist"; employee.empExp=@"4 Years"; [self.managedObjectContext save:nil]; } </code></pre>
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1. POHow to Update and Delete the required recored of a table usning Core Data
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