在应用程序层和数据库层中都按原样维护和操作业务数据信息，而且您将第3部分中看到，甚至在客户机层中也是如此。
The business data information is maintained and manipulated intact in both the application and database layers, and as you will see in Part 3, even in the client layer.
现在大多数应用程序代码都在数据库服务器中维护和运行。
Most of the application code is now maintained and run in the database server.
您可以将所有必要应用程序数据存储在一个SQL数据库中，生成一个易于维护的文件。
You can store all your necessary application data inside an SQL database, resulting in a single file that is easy to maintain.
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