iOS CoreData简单的增删改查

增

增加数据操作.png

查

    NSFetchRequest *request = [Person fetchRequest];
    
    //对查询结果排序
    //NSSortDescriptor *descriptor = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];
    //request.sortDescriptors = @[descriptor];
    
    //查询条件
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name like %@",@"*ll"];

    request.predicate = predicate;

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


    for (Person *p in arr) {
        NSLog(@"名字：%@,年龄：%d,身份证：%@",p.name,p.age,card.no);
    }

改

for (Person *p in arr) {
       p.age = 18;
    }
//保存
 [context save:&error];

删

for (Person *p in arr) {
        //删除
        [context deleteObject:p];
    }