springmvc 事务注册有很多种方法,在此我只mark 用注解方式添加transaction不生效的解决办法。

springmvc 注解方法添加事务步骤:

1.在 spring的 root-context.xml (WEB-INF/)文件中添加事物管理:

<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" p:dataSource-ref="mysqlDataSource">
</bean>

或者

<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" >
<property name="dataSource" ref="mysqlDataSource"/>
</bean>

2.添加注解驱动

<tx:annotation-driven transaction-manager="txManager"/>

3.在需要添加事物管理的java类上添加@Transactional

@Service
public class HomeServiceImpl implements HomeService {
@Autowired
private HomeDao homeDao; public static final Logger LOGGER = LoggerFactory.getLogger(HomeServiceImpl.class);
/**
* note:need add throw RuntimeException
*/
@Transactional
@Override
public int updateAgeNonException() throws Exception {
try {
Map<String,Integer> map = new HashMap<String,Integer>();
map.put("age", 10);
homeDao.updateAge(map);
map.put("age", 30);
homeDao.updateAge(map);
} catch (Exception e) {
LOGGER.error("debug ****", e);
throw new RuntimeException();
}
return 0;
}
@Override
public int updateAgeException() throws Exception {
try {
Map<String,Integer> map = new HashMap<String,Integer>();
map.put("age", 10);
homeDao.updateAge(map);
//exception
System.out.println(2/0);
map.put("age", 30);
homeDao.updateAge(map);
} catch (Exception e) { LOGGER.error("debug ****", e); throw new RuntimeException();
}
return 0;
}
public List<String> queryData() {
return homeDao.queryData();
}
}

事物添加以上3步就ok了。

启动server运行一下,看事物是否生效。一般情况下是不会生效的。

原因在于,service方法被注入了2次。解决办法:

1.在root-context.xml 中添加包扫描,扫描所有需要注入的包

<context:component-scan base-package="com.ck.fm.*"></context:component-scan> 

2.在servlet-context.xml配置文件中,包扫描的时候排除扫描service

<context:component-scan base-package="com.ck.fm.*" >
<!-- prevented Service injected twice -->
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Service" />
</context:component-scan>