事务的超时回滚

@Transactional（
            propagation=propagation.REQUIRES_NEW,
            //设置事务传播属性
            isolation=Isolation.READ_COMMITTED,
            //设置隔离级别
            timeout=2
                              //设置事务超时时间
                           ）

@Transactional(timeout = 2)
public void buyGoodsByTxTimeout(int user_id, int goods_id, int num) {
    //查询到商品价格
    Float goods_price = goodsDao.queryPriceById02(goods_id);
    //购买商品，减去余额
    goodsDao.updateBalance02(user_id, goods_price * num);
    System.out.println("====超时start====");
    try {
        Thread.sleep(4000);
        //休眠4秒
    } catch (InterruptedException e) {
      e.printStackTrace();
    }
    System.out.println("====超时end====");
    //更新库存
    goodsDao.updateAmount02(goods_id, num);
}

//测试购买商品(使用了声明式事务， 测试事务超时回滚)
@Test
public void buyGoodsByTxTimeoutTest() {
    ApplicationContext ioc = new ClassPathXmlApplicationContext("tx_ioc.xml");
    GoodsService bean = ioc.getBean(GoodsService.class);
    bean.buyGoodsByTxTimeout(1, 1, 1);
    System.out.println("------ok--------");
}