Database access middleware is the most sophisticated of all kinds. It supports communication in the application and data sources, which can be local or remote and isomorphism or heterogeneous.
数据库访问中间件是所有中间件中最成熟的一种，它支持应用程序和本地或异地的同构或异构数据源进行通信。
In order to build a middleware bridge between the front-end CGI display code and the back-end database and business logic code, an API that allows all necessary data access must be defined.
为了在前端CGI显示代码和后端数据库及业务逻辑代码之间构建一个中间件桥，必须定义一个允许所有必需数据访问的API。
The endpoint URL for database and user registry VMs indicates specific information to access that middleware.
数据库和用户注册表 VM 的端点 URL 指示了用来访问中间件的特定信息。
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