In Listing 6, I solved this problem by creating a simple Book class that inherits from DBObject.

在清单6中，通过创建一个继承自dbobject的简单book类，我解决了这个问题。

youdao

In Listing 6, I solved this problem by creating a simple Book class that inherits from DBObject.

在清单6中，通过创建一个继承自dbobject的简单book类，我解决了这个问题。

youdao