应用管理员也需要在用户变更时维护其在各个应用中的权限，保持一致。
Application administrators also have to maintain the users' rights when users' identities are changed.
一旦对各个组件进行了单元测试，就很容易在应用程序中组装和连接这些组件。
Once each component is unit tested, it is easier to assemble and wire the components in the application.
虽然应用程序编程人员总能一一建立到各个数据源的连接，但更容易的方式还是在应用程序中只使用一个数据库连接。
While it is true that an application programmer can always establish a separate connection to each individual data source, it is much easier to have a single database connection in the application.
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