如果您是使用前端的本地应用程序编程接口(Application Programming Interface, API)调用与数据库相连接，那么改变后端实现就比较困难。
If you connect to your database with native Application Programming Interface (API) calls in your front end, it becomes difficult to change the back end implementation.
身份与权限服务模块，实现对身份与权限数据库的各种操作，并向身份与权限管理模块和授权决策模块提供本地和远程接口。
The identity and access service module achieves all kinds of operations of the database and provides local and remote interfaces for the modules of identity and access management and authorization.
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