Spring配置事务在DAO层和业务逻辑层

Spring配置事务在DAO层和Service层

Spring通过AOP实现声明式事务管理。通常通过TransactionProxyFactoryBean设置Spring事务代理。我们需要一个目标对象包装在事务代理中。这个目标对象一般是一个普通Java对象的bean。当我们定义TransactionProxyFactoryBean时，必须提供一个相关的 PlatformTransactionManager的引用和事务属性。 事务属性含有上面描述的事务定义。

PlatformTransactionManager：

HibernateTransactionManager需要一个SessionFactory的引用

JtaTransactionManager

一．把事务放置在了DAO层：

<!—hibernateTransactionManager-->

<bean id="transactionManager"

       class="org.springframework.orm.hibernate3.HibernateTransactionManager">

       <property name="sessionFactory">

              <ref local="sessionFactory" />

       </property>

</bean>

<!—DAO层接口实现-->

<bean id="companyDAOTarget"

       class="com.vstsoft.querycompany.dao.impl.CompanyDAOImpl">

       <property name="sessionFactory">

              <ref local="sessionFactory" />

       </property>

</bean>

<!—spring对DAO层的事务代理-->

<bean id="companyDAOProxy"

       class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">

       <property name="transactionManager">

              <ref bean="transactionManager" />

       </property>

       <property name="target">

              <ref local="companyDAOTarget" />

       </property>

       <property name="transactionAttributes">

              <props>

              <prop key="insert*">PROPAGATION_REQUIRED</prop>

              <prop key="delete*">PROPAGATION_REQUIRED</prop>

              <prop key="find*">

              PROPAGATION_REQUIRED,readOnly

              </prop>

              </props>

       </property>

</bean>

<!—业务层接口实现，把DAO注入到Service里面-->

<bean name="companyManageTarget"

       class="com.vstsoft.querycompany.service.impl.CompanyManageTarget">

       <property name="companyDAO">

              <ref bean="companyDAOProxy" />

       </property>

</bean>

<!—spring对Service层的代理-->

<bean id="companyManageProxy"

       class="org.springframework.aop.framework.ProxyFactoryBean">

       <property name="proxyInterfaces">

              <value>com.vstsoft.querycompany.service.CompanyManage</value>

       </property>

       <property name="target">

              <ref bean="companyManageTarget" />

       </property>

</bean>

<!—配置struts访问，把service层注入到action里面-->

<bean name="/company"

       class="com.vstsoft.querycompany.web.action.CompanyAction" singleton="false">

       <property name="companyManage">

              <ref local="companyManageProxy" />

       </property>

</bean>

二．把事务放置在了Service层：

<!—jtaTransactionManager-->

<bean id="jtaTransactionManager"

       class="org.springframework.transaction.jta.JtaTransactionManager" />

<!—DAO层接口实现-->

<bean id="companyDAOTarget"

       class="com.vstsoft.querycompany.dao.impl.CompanyDAOImpl">

       <property name="sessionFactory">

              <ref local="sessionFactory" />

       </property>

</bean>

<!—spring对DAO层的代理-->

<bean id="companyDAOProxy"

       class="org.springframework.aop.framework.ProxyFactoryBean">

       <property name="proxyInterfaces">

              <value>com.vstsoft.querycompany.dao.CompanyDAO</value>

       </property>

       <property name="target">

              <ref bean="companyDAOTarget" />

       </property>

</bean>

<!—业务层接口实现，把DAO注入到Service里面-->

<bean name="companyManageTarget"

       class="com.vstsoft.querycompany.service.impl.CompanyManageTarget">

       <property name="companyDAO">

              <ref bean="companyDAOProxy" />

       </property>

</bean>

<!—spring代理业务层的事务管理-->

<bean id="companyManageProxy"

       class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">

       <property name="transactionManager">

              <ref local="jtaTransactionManager" />

       </property>

       <property name="transactionAttributes">

              <props>

                     <prop key="set*">PROPAGATION_REQUIRED</prop>

                     <prop key="find*">PROPAGATION_REQUIRED,readOnly</prop>

              </props>

       </property>

       <property name="target">

              <ref bean="companyManageTarget" />

       </property>

</bean>

<!—配置struts访问，把service层注入到action里面-->

<bean name="/company"

       class="com.vstsoft.querycompany.web.action.CompanyAction" singleton="false">

       <property name="companyManage">

              <ref local="companyManageProxy" />

       </property>

</bean>

在service层的接口实现CompanyManageImpl里面有个setData方法：按顺序执行数据查询，数据删除，数据插入数据库行为，如果哪一步出异常（运行时异常），事务回滚，只有所有行为都没成功，事务提交。