您还可以通过连接池配置数据源（Data Source）。
You also can configure a Data Source with the connection pool.
通过在运行时运用JNDI，你可以获得连接池的好处和服务器提供的额外的功能。
By using JNDI connections at runtime, you can obtain the benefits of connection pooling and additional application server-provided functionality.
该模块的代码必须通过JNDI查找连接池。
The module's code must look up the connection pool through JNDI.
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