A trusted context is an object that gives users a specific set of privileges and is available when the user connects to the database through a trusted connection.
受信任上下文是一个对象，它为用户提供一组特定的特权，当用户通过一个受信任的连接连接到数据库时，便可以使用它。
User mapping - a user mapping has to be defined for each user who wants to access the remote database using the previously defined server object.
用户映射-对于希望用前面定义的服务器对象访问远程数据库的每个用户，都必须创建一个用户映射。
The main layers of the application are a database, a persistence framework, a database access object, and user interface (UI) controller and view layers.
应用程序的主要层是数据库、持久性框架、数据库访问对象和用户界面(UI)控制器及视图层。
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