保存的對象列表將引發休眠異常

Question

當我通過調用saveListOfPageChooserElement保存對象List時，它將引發以下異常

而當我通過調用saveOrUpdate保存單個實例時，則可以正常工作。

但是為了提高性能，我想一次保存一個List批而不是單個對象。

誰能建議一次保存整個列表有什么問題？

 List<Abc> listabc = widgetCopyDAO
                    .fetchabcByPageId(id);


    for (Abc abc: listabc ) {
                abc.setLastUpdatedBy(null);
                abc.setLastUpdatedOn(null);
                abc.setCreatedBy(widgetCopyDTO.getUserName());
                abc.setCreatedOn(new Date());
                abc.setPageChooser(new PageChooser(chooser.getId()));



                abc.setId(0l);
                issuePageWidgetDAO.saveOrUpdate(abc);
            }
//  widgetCopyDAO.saveListOfPageChooserElement(listabc);


public void saveOrUpdate(Abc abc) {
        if (abc.getId() == 0) {
            Long id = (Long) this.getHibernateTemplate().save(
                    abc);
            abc.setId(id);
        } else {
            this.getHibernateTemplate().update(abc);
        }
    }


public void saveListOfPageChooserElement(
            List<Abc> listabc) {
        this.getHibernateTemplate().saveOrUpdateAll(listabc);

    }

例外是

org.springframework.orm.hibernate3.HibernateSystemException: identifier of an instance of com.mct.model.Abc was altered from 138 to 0; nested exception is org.hibernate.HibernateException: identifier of an instance of com.mct.model.Abc was altered from 138 to 0
    at org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:676)
    at org.springframework.orm.hibernate3.HibernateAccessor.convertHibernateAccessException(HibernateAccessor.java:412)
    at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:424)
    at org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374)
    at org.springframework.orm.hibernate3.HibernateTemplate.findByCriteria(HibernateTemplate.java:1055)
    at org.springframework.orm.hibernate3.HibernateTemplate.findByCriteria(HibernateTemplate.java:1048)
    at com.mct.dao.WidgetCopyDAO.fetchPageChooserWithImagesByChooser(WidgetCopyDAO.java:82)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
    at org.springframework.aop.framework.adapter.ThrowsAdviceInterceptor.invoke(ThrowsAdviceInterceptor.java:126)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
    at org.springframework.aop.framework.adapter.AfterReturningAdviceInterceptor.invoke(AfterReturningAdviceInterceptor.java:50)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
    at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:50)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
    at $Proxy58.fetchPageChooserWithImagesByChooser(Unknown Source)
    at com.mct.service.widgethelper.ChooserWidget.copyWidget(ChooserWidget.java:676)
    at com.mct.service.widgethelper.ChooserWidget.copyAllWidgets(ChooserWidget.java:634)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown 

Answer 1

您在列表中設置所有對象的ht Ids：

abc.setId(0l);

這就是導致錯誤的原因。 您不能自己更改自動生成的ID。

刪除此行。

Answer 2

在休眠狀態下，您無法手動設置Id（自動生成），如下所示。

abc.setId(0l);

刪除此行上方，然后重試。

Answer 3

問題似乎是此行：

abc.setId(0l);

您正在清除從數據庫中加載的實體的ID。