I would strongly suggest that you go back to the first article to review the basic function of these objects.

我强烈建议重新阅读一下第一篇文章，以回顾这些对象的基本功能。

youdao

You should also review the Resources at the end of this tutorial for more information about database objects and programming methods.

还应查阅本教程最后的 参考资料，获取关于数据库对象和编程方法的更多信息。

youdao

We'll start with a review of the DAO design pattern and data access objects.

我们将以对DAO设计模式和数据访问对象的概述开始。

youdao