Core Data 更新某条指定记录数据
一:流程
- 同样需要先查询出指定记录
- 更新指定记录
二:代码:
//更新操作 - (void)updateThePersonData { NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; [fetchRequest setEntity:[NSEntityDescription entityForName:@"Entity" inManagedObjectContext:self.appDelegate.managedObjectContext]]; //更新谁的条件在这里配置; NSString *theName = @"uptest"; [fetchRequest setPredicate:[NSPredicate predicateWithFormat:@"name==%@", theName]]; NSError* error = nil; NSArray* results = [self.appDelegate.managedObjectContext executeFetchRequest:fetchRequest error:&error]; if (results.count > 0) { NSLog(@"%@",results); Entity *entiy = [results objectAtIndex:0]; entiy.address = @"your address is update to JiNan"; } }
上图代码:把 指定名为 uptest的 记录的 地址,更新为 your address is update to JiNan
参考:http://stackoverflow.com/questions/10571786/how-to-update-existing-object-in-core-data