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再谈 a different object with the same identifier val

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a different object with the same identifier value was already associated with the session


刚才自己调试程序时出现这个异常。
后来google 百度都说是session.clean()一下。而我的问题与这个不同,虽然抛出的异常相同。
现在解决了。做个记录,如果有和我相同问题的人希望对其有所帮助。

问题原因:我有两个表,wp和zjyj。(物品表 和 专家意见表)
这两个表的关系是 zjyj 和 wp 是多对一的关系。
我在增加物品同时需要对 专家意见表中建立一条只有 id 和 wpid 的记录。所以我开始的代码是
IWpService service = (IWpService) BeanUtil.getBean("wpService");
Wp wp = new Wp();
wp.setStatus(1);
Zjyj zjyj = new Zjyj();
zjyj.setWp(wp);
service.saveWp(wp);// 保存物品
这样目的是将wp和zjyj的表内容填写完毕后直接保存。
可是其中没有注意到wp表在没有保存是id是不能确定的。

所以应该改成下面
IWpService service = (IWpService) BeanUtil.getBean("wpService");
Wp wp = new Wp();
wp.setStatus(1);
service.saveWp(wp);// 保存物品
Zjyj zjyj = new Zjyj();
IZjyjDao zjyjDao = (IZjyjDao) BeanUtil.getBean("zjyjService");
zjyj.setWp(wp);
zjyjDao.save(zjyj);
大家可以断点测试一下。会发现。
在wp保存了后,wp对象中的wpid就赋值了。
接下来在保存zjyj。就没有问题。

 

 

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