Refine the code: Change the automatically generated code according to the use case.

修改代码：根据用例来更改自动生成的代码。

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Technically, this step need not occur first, but it needs to occur early; it should be obvious that you should create the database before any application code, even automatically generated code.

技术上这个步骤不必最先进行，不过需要在早期完成；应该在编写任何应用程序代码(甚至是自动生成的代码)之前创建数据库，这应该是显然的。

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