在更新数据库后只有几个数据量发生变化时，如何重新加载可变数据？ （IOS）

I have about 200 records that I am redownloading from the server everytime a view controller is displayed as I need to display the most up to date information - related to the 200 customers' balance. Each record also contains other details about the customer which could change too. I have about 200 records that I am redownloadin