org.hibernate.TransientObjectException: object references an unsaved transient instance
2009-11-12 15:10
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异常1:not-null property references a null or transient value 解决方法:将“一对多”关系中的“一”方,not-null设置为false (参考资料:http://www.thearcmind.com/confluence/pages/viewpage.action?pageId=212) 异常2:org.hibernate.TransientObjectException: object references an unsaved transient instance 解决方法:cascade="save-update,persist" (参考资料:http://www.laliluna.de/254.html) 异常3:org.hibernate.QueryException: could not resolve property 解决方法:"from Category category where category.userID = :userID"修改为"from Category category where userID = :userID"或者"from Category category where category.user.id = :userID" (参考资料:http://www.laliluna.de/277.html) 异常4:could not initialize proxy - the owning Session was closed 解决方法:设置lazy为false (参考资料:http://forum.springframework.org/showthread.php?t=27993) 异常2我在应用中碰到了这样的问题: 有三个表:userInfo deptmentInfo role userInfo 与deptmentInfo为many to one userInfo 与role为many to one 下面为保存UserInfo对象时的代码: DeptmentInfo dept = new DeptmentInfo(); dept.setDeptName(deptName); Role role = new Role(); role.setRoleName(roleName); UserInfo user = new UserInfo(); user.setUserName(userName); user.setUserSex(userSex); user.setDuty(duty); user.setPhone(phone); user.setMobileNum(mobileNum); user.setEmail(email); user.setQq(qq); user.setMsn(msn); user.setAdress(adress); user.setDeptmentInfo(dept); user.setRole(role); dao.save(user); 执行时有错:org.hibernate.TransientObjectException: object references an unsaved transient instance 于是改了UserInfo.hbm.xml的一些地方 如下: <many-to-one name="role" class="com.oa.domain.Role" cascade="save-update,persist" fetch="select"> <column name="ROLE_ID" precision="22" scale="0" /> </many-to-one> <many-to-one name="deptmentInfo" class="com.oa.domain.DeptmentInfo" cascade="save-update,persist" fetch="select"> <column name="DEPT_ID" precision="22" scale="0" /> </many-to-one> 加了上面红色部分的,就OK了,能保存了。 本文转载自:http://hi.baidu.com/wl858621/blog/item/741446d7f3a420d8a144dfdd.html/cmtid/4b83ee0ff6931fe4ab6457fa |
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