MySQLNonTransientConnectionException: No operations allowed after connection closed.
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今天碰上了一个离奇的问题，在用同一个Dao存取数据库的时候，这个Dao之前的操作没问题，Dao第二个操作就报异常
MySQLNonTransientConnectionException: No operations allowed after connection closed.
仔细检查了代码，看了这篇博客之后，发现在上一次操作之后，方法中释放了连接。
为了多次利用Connection，我让Dao一个大类共用一个Connection，在结束操作时手动释放连接。
删掉释放链接的语句，程序正常
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