为这些组件创建包装外观，会隐藏遗留组件间复杂的交互细节，并提供了一个抽象，使新旧代码不致混淆。
The creation of wrapper-facades for these components hid the details of complex interactions between the legacy components, and also provided an abstraction that protected new code from legacy code.
在结束项目时，您将拥有系统的抽象模型、构建数据库的SQL代码和用于每个表的PHP包装器。
By the end of this project, you'll have an abstract model of your system, SQL code to build the database, and PHP wrappers for each table.
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