If a user connection starts a transaction and disconnects before committing or rolling back the transaction, and a connection thereafter reuses the same thread, the previous transaction still stays open.

• 如果一个用户连接启动了一个事务并在提交或回滚事务前断开,并且随后的一个连接重用了此同一线程,则前一事务仍保持打开状态。