两次遇到这个问题a different object with the same identifier value
第一次是要修改数据库里的记录，因为之前已经将该条记录取到了session缓存中，用update（游离态对象）方法时发生错误，一个游离态对象和一个持久态对象，具有相同OID，因此报错。
解决办法用merge（游离态对象），该方法应该是根据游离态对象的OID，执行select语句，将游离态对象转成了持久化对象，之后update（）；
第二次是要删除数据库记录，一样session中已经有该OID的持久化对象，我却执行了delete（游离态对象），报错。
解决：先根据游离态对象OID从session中get持久化对象，并赋值给游离态对象，这样游离转持久，之后执行delete就可以了。
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