Question

采用以下代码:

MyEntity e = dao.getEntity(1);
e.setProp1(someVal);
e.setProp2(otherVal);

MyEntity eOld = dao.getEntity(1);

如果我照此办理,那么(因为Hibernate检测到它为 d脏)就会得到更新,eOld将拥有同样的财产价值(prop1,pro2)a。是否有办法使这一继承实体处于持续状态(如数据库中)?

Answer 1

实际上,我已经找到了解决办法。

I had already tried evicting eOld but that doesn t make since, I need to evict e before retrieving eOld and after the compare (for auditing) reattach (merge) e to the session again. It seems to work in any case.

Answer 2

Try:

<property name="defaultAutoCommit" value="false" />

或可替代使用<代码>detach,并在准备就绪时重新投入使用。

dao.detach(e);
...
e.setProp1("AnotherVal"); //not propatated to the database
dao.merge(cat);  // update

友情链接