使用org.postgresql.ds.PGPoolingDataSource
这是一个例子：
/documentation/head/ds-ds.html
我已经使用JDBC4驱动程序检查了这个例子,它工作正常.
然而在这个链接的文档中,由于它的局限性,他们不鼓励使用postgreSQL池数据源：
The pooling data-source implementation provided here is not the most feature-rich in the world. Among other things, connections are never closed until the pool itself is closed; there is no way to shrink the pool. As well, connections requested for users other than the default configured user are not pooled. Its error handling sometimes cannot remove a broken connection from the pool. In general it is not recommended to use the PostgreSQL˘ provided connection pool. Check your application server or check out the excellent jakarta commons DBCP project.
他们建议使用DBCP连接池：/proper/commons-dbcp/
检查一下,它更好 – 只需下载库文件,将它们放在一个类中并导入到项目中,从上述链接的文档中包含如何在代码中使用的示例.
大多数(所有？)应用服务器实现自己的连接池,如果您正在使用应用程序服务器,这是最好的选择.
对于示例,Tomcat 7具有自己的连接池的实现,比DBCP更好,检查文档：/tomcat-7.0-doc/jdbc-pool.html
