hibernate 一对多级联保存修改删除

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一对多，一端设置：

一)保存级联

问题：

一方主键数据库中没有，先保存多方时，回报引用暂时态对象错误，

分析：

先不关联多方地保存一方，

解决：

假设一方A，多方B

1）B.setA(A);

2）A.getSetB().add(B);

3）session.save(A);

或：

 // 插入记录

         session.saveOrUpdate(workorder);

         tr.commit();

         session.close();

         session = hibernateDao.getHSession();

         tr = session.beginTransaction();

         // 添加工单历史

         TWorkorderHistory tWorkorderHistory = new TWorkorderHistory(workorder,

                 pureUser, 1L, new Timestamp(new Date().getTime()), Short

                         .parseShort("0"));

         session.saveOrUpdate(tWorkorderHistory);

         workorder.getTWorkorderHistories().add(tWorkorderHistory);

         // 插入记录

         tr.commit();

         session.close();

保存级联

二)修改级联

问题一:

org.hibernate.HibernateException: illegally attempted to associate a proxy with two open Sessions

解决:

参考:http://blog.163.com/chinagujing@yeah/blog/static/170937439201092405558777/

http://littie1987.iteye.com/blog/1039082

 @Override

     public void update(TWorkorderInfo workorder,User pureUser, String note, Short status)

             throws DataAccessException {

         workorder.setStatus(status);

         workorder.setUpdated(new Timestamp(new Date().getTime()));

         //开启事务

         Session session = hibernateDao.getHSession();

         Transaction tr = session.beginTransaction();

         TWorkorderHistory tWorkorderHistory = new TWorkorderHistory();

         tWorkorderHistory.setTWorkorderInfo(workorder);

         tWorkorderHistory.setCreated(new Timestamp(new Date().getTime()));

         tWorkorderHistory.setOptType(status);

         tWorkorderHistory.setNote(note);

         tWorkorderHistory.setPureUser(pureUser);

         tWorkorderHistory.setWorkflowId(1L);

         session.saveOrUpdate(tWorkorderHistory);

         workorder.getTWorkorderHistories().add(tWorkorderHistory);

         session.merge(workorder);

         tr.commit();

         session.close();

     }

更新级联

问题二:

org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: com.bonc.pure.domain.User

分析：

前台忘记传这个User了，一共有两个这样的User对象，后台只set了一个，前台传的是workorder.pureUserByModifier.userName，

struts给new的这个User对象只有userName一个属性，没有userId，而主键关联是需要通过userId的

解决:

<s:hidden name="workorder.pureUserByModifier.userId"></s:hidden>

二) 删除级联

问题:

org.hibernate.HibernateException: illegally attempted to associate a proxy with two open Sessions

解决:

参考:http://www.itzhai.com/hibernate-one-to-many-association-mapping-configuration-and-the-cascade-delete-problem.html

 Session session = hibernateDao.getHSession();

             session.beginTransaction();

             TWorkorderInfo workorder = (TWorkorderInfo) session.load(clazz, workorderCode);

             session.delete(workorder);

             session.beginTransaction().commit();

删除级联