外键不仅具有标识记录的标识符，而且还具有标识表的一个类型。
The foreign key has not only an identifier to identify a record, but also a type to identify the table.
使用load方法并传递需要加载的类类型以及记录的标识符值。
You use the load method and pass it the class type you want to load, as well as the identity value for the entry you want.
使用load方法并传递需要加载的类类型以及记录的标识符值。
You use the load method and pass it the class type you want to load, as well as the identity value for the entry you want.
应用推荐