spring与hibernate 集成

最新推荐文章于 2019-05-25 16:06:14 发布

最新推荐文章于 2019-05-25 16:06:14 发布 · 166 阅读

文章标签：

#Hibernate #Spring #AOP #Bean #DAO

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本文探讨了在Spring框架下使用Hibernate操作数据库时遇到的“collection is not associated with any session”异常。通过对比两种获取对象的方法，分析了事务管理与Session管理的关系，并提供了解决方案。

public ExamQuestionEx getInitialed(Integer quesId) {
		ExamQuestionEx q = new ExamQuestionEx();
		String hql = "from ExamQuestionEx where id = ? ";
 		/*List<ExamQuestionEx> list = this.getHibernateTemplate().find(hql,quesId);
		if(list!=null&&list.size()>0){
			q = list.get(0);
		}else{
			return null;
		}*/
		q = (ExamQuestionEx) this.getSession().get(ExamQuestionEx.class, quesId);
		
		if(!Hibernate.isInitialized(q.getAnswers())){
			Hibernate.initialize(q.getAnswers());
		}
		if(!Hibernate.isInitialized(q.getOptions())){
			Hibernate.initialize(q.getOptions());
		}
		return q;
	}

用

List<ExamQuestionEx> list = this.getHibernateTemplate().find(hql,quesId);
		if(list!=null&&list.size()>0){
			q = list.get(0);
		}else{
			return null;
		}

替换

q = (ExamQuestionEx) this.getSession().get(ExamQuestionEx.class, quesId);

会报错

org.hibernate.HibernateException: collection is not associated with any session

上述方法为dao层方法。

spring的配置为：

    <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory"/>
    </bean>
	<tx:advice id="txAdvice" transaction-manager="transactionManager">
		<tx:attributes>
			<tx:method name="save*" propagation="REQUIRED"/>
			<tx:method name="send*" propagation="REQUIRED"/>
			<tx:method name="add*" propagation="REQUIRED"/>
			<tx:method name="create*" propagation="REQUIRED"/>
			<tx:method name="del*" propagation="REQUIRED"/>
			<tx:method name="remove*" propagation="REQUIRED"/>
			<tx:method name="update*" propagation="REQUIRED"/>
			<tx:method name="get*" propagation="SUPPORTS" read-only="true"/>
			<tx:method name="search*" propagation="SUPPORTS" read-only="true"/>
		</tx:attributes>
	</tx:advice>
	<aop:config>
		<aop:pointcut id="affectMethods" expression="execution(* com.buisoft.eit.service.impl.*.*(..))"/>
		<aop:advisor advice-ref="txAdvice" pointcut-ref="affectMethods"/>
	</aop:config>

事务指向到service方法。