14.spring声明事务

1.要开启 Spring 的事务处理功能，在 Spring 的配置文件中创建一个 DataSourceTransactionManager 对象：

<!--配置声明式事务-->
<bean id="transationManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource"/>
</bean>

<!--结合AOP实现事务的织入-->
<!--配置事务通知-->
<tx:advice id="txAdvice" transaction-manager="transationManager">
    <tx:attributes>
        <!--给那些方法配置事务-->
        <!--propagation 配置事务的传播性-->
        <tx:method name="addUser" propagation="REQUIRED"/>
        <tx:method name="delUser" propagation="REQUIRED"/>
        <tx:method name="*" propagation="REQUIRED"/>
    </tx:attributes>
</tx:advice>

<!--配置事务的切入-->
<aop:config>
    <aop:pointcut id="pointCut" expression="execution(* com.zuo.dao.UserMapperImpl.*.*(..))"/>

    <aop:advisor advice-ref="txAdvice" pointcut-ref="pointCut"/>
</aop:config>

事务的管理有两种

  第一种：交由容器管理事务

  （1）配置事务

public class UserMapperImpl2 extends SqlSessionDaoSupport implements UserMapper {

    @Override
    public List<User> UserList() {

        UserMapper mapper = getSqlSession().getMapper(UserMapper.class);

        User addUser = new User(5, "xiaoKUN", "123456");

        mapper.addUser(addUser);

        mapper.delUser(5);

        return mapper.UserList();

    }

    @Override
    public int addUser(User user) {
        return getSqlSession().getMapper(UserMapper.class).addUser(user);
    }

    @Override
    public int delUser(int id) {
        return getSqlSession().getMapper(UserMapper.class).delUser(id);
    }
}

  （2）在spring-dao.xml中配置声明式事务

<!--配置声明式事务-->
<bean id="transationManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource"/>
</bean>

<!--结合AOP实现事务的织入-->
<!--配置事务通知-->
<tx:advice id="txAdvice" transaction-manager="transationManager">
    <tx:attributes>
        <!--给那些方法配置事务-->
        <!--propagation 配置事务的传播性-->
        <tx:method name="addUser" propagation="REQUIRED"/>
        <tx:method name="delUser" propagation="REQUIRED"/>
        <tx:method name="*" propagation="REQUIRED"/>
    </tx:attributes>
</tx:advice>

<!--配置事务的切入-->
<aop:config>
    <aop:pointcut id="pointCut" expression="execution(* com.zuo.dao.UserMapperImpl.*.*(..))"/>

    <aop:advisor advice-ref="txAdvice" pointcut-ref="pointCut"/>
</aop:config>

  （3）测试

public class MyTest {

    @Test
    public void test(){

       ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");

        UserMapper mapper = context.getBean("userMapper2", UserMapper.class);

        List<User> userList = mapper.UserList();

        for (User user : userList) {
            System.out.println(user);
        }

    }

}

  第二种：编程式的事务管理

    定义显式的捕获异常和业务的回滚操作