general database access component 通用数据库访问组件
When an EJB component wants to access a database, a message queue server, or some other transactional resource, it acquires a connection to the resource manager (usually by using JNDI).
当一个EJB组件想访问数据库、消息队列服务器或者其它一些事务性资源时，它需要到资源管理器的连接(通常是使用JNDI)。
If a user is not permitted to access a database that contains a component, allowing the user to access a page with that component does not give him or her access to that database.
如果不允许用户访问包含组件的数据库，那么可以允许他访问含有该组件的页面，但同时又不能访问数据库。
When a component such as a resource adapter on WebSphere Process Server needs database access, it uses a server data source.
当 WebSphere Process Server 上的组件（如资源适配器）需要访问数据库时，它将使用服务器数据源。
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