a different object with the same identifier value was already associated with the session
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今天在做ssh2的项目的时候，出现了这个错误，一直觉得自己的代码没有错，找了很久。。。。
渣渣的我在绝望的时候，突然弄好了！！！
原来，我在dao层从数据库中获取数据得到一个po对象，然后我在service层有一个方法再将其转化为VO对象
当我要用他时，要将这个VO对象转化为PO对象，进行删除。。。
问题就是出在这里。。。session都关闭了，由Vo对象再转成所谓的PO对象，能再进行数据库的操作吗！！！
简化这其中的繁琐转化，直接要dao直接操作PO对象即可
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