Invalid state, the Connection object is closed.
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解决了此问题：
如果数据库有值，用hibernate查询会报错：
Invalid state, the Connection object is closed.没数据的话，不报错。
原因：
某字段设了char(32),保存汉子，如果10几个汉子了，会导致hibernate认为取出的是不全数据，进而关闭连接。
换成varchar(300)就好了。
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