Nonautomatic accessors require you to explicitly retrieve the data.
非自动存取子会要求您明确地撷取资料。
2
Use a nonautomatic accessor if you are binding to a large data field (like a bitmap image) that you might not want to retrieve for every record.
如果您正在系结不想从中撷取每一笔资料的大型资料栏位 （例如点阵图影像），请使用非自动存取子。
3
Finally, there's an important caveat you need to remember: once a database has been created or converted to use automatic storage, it cannot be converted to a nonautomatic storage database.