如何加快使用Core Data将新对象插入实体的速度

Question

这是我的代码,它采用一些JSON数据并将其插入Core Data room实体:

for (NSDictionary *room in rooms)
    {
        NSDictionary *thisroom = [room objectForKey:@"room"];
        NSString *roomidstring = [thisroom objectForKey:@"roomid"];
        int roomid = [roomidstring intValue];
        NSString *roomname = [thisroom objectForKey:@"roomname"];
        NSString *buildingidstring = [thisroom objectForKey:@"buildingid"];
        int buildingid = [buildingidstring intValue];

        // import into database
        NSManagedObject *roomInfo = [NSEntityDescription insertNewObjectForEntityForName:@"room" inManagedObjectContext:context];
        [roomInfo setValue:[NSNumber numberWithInteger:roomid] forKey:@"roomid"];
        [roomInfo setValue:roomname forKey:@"roomname"];
        [roomInfo setValue:[NSNumber numberWithInteger:buildingid] forKey:@"buildingid"];
         if (![context save:&error]) {
            NSLog(@"Whoops, couldn't save: %@", [error localizedDescription]);
        }
    }

插入约900个物体时速度极慢.有没有办法让这个更高效和/或加快速度？

谢谢!

Answer 1

是的,在完成循环之前不要保存,或者如果内存有问题则分批保存.保存操作非常昂贵,因此您应该避免经常在像这样的紧密循环中保存.

for (NSDictionary *room in rooms)
{
    NSDictionary *thisroom = [room objectForKey:@"room"];
    NSString *roomidstring = [thisroom objectForKey:@"roomid"];
    int roomid = [roomidstring intValue];
    NSString *roomname = [thisroom objectForKey:@"roomname"];
    NSString *buildingidstring = [thisroom objectForKey:@"buildingid"];
    int buildingid = [buildingidstring intValue];

    // import into database
    NSManagedObject *roomInfo = [NSEntityDescription insertNewObjectForEntityForName:@"room" inManagedObjectContext:context];
    [roomInfo setValue:[NSNumber numberWithInteger:roomid] forKey:@"roomid"];
    [roomInfo setValue:roomname forKey:@"roomname"];
    [roomInfo setValue:[NSNumber numberWithInteger:buildingid] forKey:@"buildingid"];
}


if (![context save:&error]) {
     NSLog(@"Whoops, couldn't save: %@", [error localizedDescription]);
}