a different object with the same identifier value was already associated with the session解决之道
2011-08-13 02:49
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通常原因及解决之道
1、a different object with the same identifier value was already associated with the session。
错误原因:在hibernate中同一个session里面有了两个相同标识但是是不同实体。
解决方法一:session.clean()
PS:如果在clean操作后面又进行了saveOrUpdate(object)等改变数据状态的操作,有可能会报出"Found two representations of same collection"异常。
解决方法二:session.refresh(object)
PS:当object不是数据库中已有数据的对象的时候,不能使用session.refresh(object)因为该方法是从hibernate的session中去重新取object,如果session中没有这个对象,则会报错所以当你使用saveOrUpdate(object)之前还需要判断一下。
解决方法三:session.merge(object)
PS:Hibernate里面自带的方法,推荐使用。
2、 项目实际操作:
由于Spring中配置的业务层的事务传播属性一般为PROPAGATION_REQUIRED(支持当前事务,如果当前没有事务,就新建一个事务),一般在一个action中单个方法中出现调用了两次业务层的方法,ServiceA.methodA和ServiceB.methodB,由于执行ServiceA.methodA的时候,
ServiceA.methodA已经起了事务,这时调用ServiceB.methodB,ServiceB.methodB看到自己已经运行在ServiceA.methodA
的事务内部,就不再起新的事务。而假如ServiceA.methodA运行的时候发现自己没有在事务中,他就会为自己分配一个事务。故而两个方法方位数据库时的session不一致
解决方法:
将ServiceB.methodB放入ServiceA.methodA中,原则上完全可以实现!!!!!
1、a different object with the same identifier value was already associated with the session。
错误原因:在hibernate中同一个session里面有了两个相同标识但是是不同实体。
解决方法一:session.clean()
PS:如果在clean操作后面又进行了saveOrUpdate(object)等改变数据状态的操作,有可能会报出"Found two representations of same collection"异常。
解决方法二:session.refresh(object)
PS:当object不是数据库中已有数据的对象的时候,不能使用session.refresh(object)因为该方法是从hibernate的session中去重新取object,如果session中没有这个对象,则会报错所以当你使用saveOrUpdate(object)之前还需要判断一下。
解决方法三:session.merge(object)
PS:Hibernate里面自带的方法,推荐使用。
2、 项目实际操作:
由于Spring中配置的业务层的事务传播属性一般为PROPAGATION_REQUIRED(支持当前事务,如果当前没有事务,就新建一个事务),一般在一个action中单个方法中出现调用了两次业务层的方法,ServiceA.methodA和ServiceB.methodB,由于执行ServiceA.methodA的时候,
ServiceA.methodA已经起了事务,这时调用ServiceB.methodB,ServiceB.methodB看到自己已经运行在ServiceA.methodA
的事务内部,就不再起新的事务。而假如ServiceA.methodA运行的时候发现自己没有在事务中,他就会为自己分配一个事务。故而两个方法方位数据库时的session不一致
解决方法:
将ServiceB.methodB放入ServiceA.methodA中,原则上完全可以实现!!!!!
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