数据库访问组件odbc已经遭受到性能上的尴尬。
The database access, ODBC, has suffered from performance stigma.
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)。
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).
最后,当用户尝试访问EJB组件时,就会运行为特定数据库而部署的代码。
Finally, when someone attempts to access the Entity EJB components, the code deployed for the given database will then be run.
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