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。
In this step, changes to the automatically generated code are required to handle one or more of the failure scenarios described previously.
在这一步中，会获得对自动生成代码所做的更改，以处理前面所描述的一个或者多个失败。
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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