Due to the design of the application server, JMS connections can be closed because the Aged timeout has elapsed, even if JMS sessions created from that connection are involved in a transaction.

由于应用服务器设计的原因，JMS连接可能会因为超过过时超时而关闭，即使从该连接创建的JMS会话涉及一个事务也是如此。

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When the script ends or when a connection is about to be closed, if you have an outstanding transaction, PDO will automatically roll it back.

当脚本结束时，或者当一个连接即将被关闭时，如果有一个未完成的事务，那么 PDO 将自动回滚该事务。

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That is, the real database connections are closed relatively infrequently, but their pooled proxies are acquired and released with every transaction.

也就是说，真正的数据库连接会相对较少关闭，但它们的池代理则会随着每个事务获取或释放。

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