8.1.拷贝上一章代码

8.2.applicationContext.xml

<!-- 开启spring对注解事务的支持 -->
<tx:annotation-driven transaction-manager="transactionManager"/> 

8.3.service

@Service
@Transactional(readOnly=true,propagation= Propagation.SUPPORTS)
public class UserServiceImpl implements UserService {

    @Autowired
    private UserMapper userMapper;
    /**
     * 转账
     * @param source
     * @param target
     * @param money
     */
    @Override
    @Transactional(readOnly=false,propagation=Propagation.REQUIRED)
    public void updateUser(String source, String target, Float money) {
        userMapper.updateUserOfSub(source, money);
        int a = 6/0;
        userMapper.updateUserOfAdd(target, money);
    }
}

8.4.测试

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")//加载配置文件
public class ServiceTest {
    @Autowired
    private UserService userService;
    /**
     * 转账业务
     */
    @Test
    public void testUpdate(){
        userService.updateUser("张三丰","宋远桥",1F);
    }
}

• 事务回滚：