spring整合mybatis是如何配置事务的?

http://czj4451.iteye.com/blog/2037759

mybatis的事务管理：

一、单独使用mybatis组件，使用SqlSession来处理事务：

public class MyBatisTxTest {

  private static SqlSessionFactory sqlSessionFactory;
  private static Reader reader;

  @BeforeClass
  public static void setUpBeforeClass() throws Exception {
    try {
      reader = Resources.getResourceAsReader("Configuration.xml");
      sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
    } finally {
      if (reader != null) {
        reader.close();
      }
    }
  }

  @Test
  public void updateUserTxTest() {
    SqlSession session = sqlSessionFactory.openSession(false); // 打开会话，事务开始

    try {
      IUserMapper mapper = session.getMapper(IUserMapper.class);
      User user = new User(9, "Test transaction");
      int affectedCount = mapper.updateUser(user); // 因后面的异常而未执行commit语句
      User user = new User(10, "Test transaction continuously");
      int affectedCount2 = mapper.updateUser(user2); // 因后面的异常而未执行commit语句
      int i = 2 / 0; // 触发运行时异常
      session.commit(); // 提交会话，即事务提交
    } finally {
      session.close(); // 关闭会话，释放资源
    }
  }
}

测试会发现数据没有被修改

和Spring集成后，使用Spring的事务管理：

 <!-- 数据源 -->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource" lazy-init="true">
        <property name="driverClassName">
            <value>org.logicalcobwebs.proxool.ProxoolDriver</value>
    </property>
    <property name="url">
        <value>proxool.gcld</value>
    </property>
</bean>

<!-- sessionFactory -->
<bean id="sessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
     <property name="configLocation" value="classpath:mybatis-config.xml">
         </property>
    <property name="dataSource" ref="dataSource"/>
</bean>

<!-- 事务管理器 -->  
<bean id="txManager"  
    class="org.springframework.jdbc.datasource.DataSourceTransactionManager">  
        <property name="dataSource" ref="dataSource" />  
</bean>  

<!-- 事务注解驱动，标注@Transactional的类和方法将具有事务性 -->  
<tx:annotation-driven transaction-manager="txManager" />  

<bean id="userService" class="com.john.hbatis.service.UserService" />  

@Service("userService")
public class UserService {

  @Autowired
  IUserMapper mapper;

  public int batchUpdateUsersWhenException() { // 非事务性
    User user = new User(9, "Before exception");
    int affectedCount = mapper.updateUser(user); // 执行成功
    User user2 = new User(10, "After exception");
    int i = 1 / 0; // 抛出运行时异常
    int affectedCount2 = mapper.updateUser(user2); // 未执行
    if (affectedCount == 1 && affectedCount2 == 1) {
      return 1;
    }
    return 0;
  }

  @Transactional
  public int txUpdateUsersWhenException() { // 事务性
    User user = new User(9, "Before exception");
    int affectedCount = mapper.updateUser(user); // 因后面的异常而回滚
    User user2 = new User(10, "After exception");
    int i = 1 / 0; // 抛出运行时异常，事务回滚
    int affectedCount2 = mapper.updateUser(user2); // 未执行
    if (affectedCount == 1 && affectedCount2 == 1) {
      return 1;
    }
    return 0;
  }
}

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = { "classpath:beans-da-tx.xml" })
public class SpringIntegrateTxTest {

  @Resource
  UserService userService;

  @Test
  public void updateUsersExceptionTest() {
    userService.batchUpdateUsersWhenException();
  }

  @Test
  public void txUpdateUsersExceptionTest() {
    userService.txUpdateUsersWhenException();
  }
}

================================================================================

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

@Transactional
public void blabla(){
}