Spring使用注解方式处理事务

<? xml version = "1.0" encoding = "UTF-8" ?>

< beans xmlns = "http://HdhCmsTestspringframework.org/schema/beans"

        xmlns:xsi = "http://HdhCmsTestw3.org/2001/XMLSchema-instance"

        xmlns:tx = "http://HdhCmsTestspringframework.org/schema/tx" xmlns:context = "http://HdhCmsTestspringframework.org/schema/context"

        xsi:schemaLocation="http://HdhCmsTestspringframework.org/schema/beans

  http://HdhCmsTestspringframework.org/schema/beans/spring-beans-2.0.xsd

  http://HdhCmsTestspringframework.org/schema/tx

  http://HdhCmsTestspringframework.org/schema/tx/spring-tx-2.0.xsd http://HdhCmsTestspringframework.org/schema/context https://HdhCmsTestspringframework.org/schema/context/spring-context.xsd">

<!--声明事务管理器-->

< bean id = "transactionManager" class = "org.springframework.jdbc.datasource.DataSourceTransactionManager" >

    < property name = "dataSource" ref = "myDataSource" />

</ bean >

<!--声明事务的注解驱动

   transaction-manager：事务管理器对象的id

-->

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

/**使用注解来设值事务的属性(传播行为,隔离等级,超时,当哪些异常发生的时候触发回滚事务)

  * 注意:该注解必须使用在公有函数上，而且抛出的异常必需继承RuntimeException

  * */

@Transactional (propagation = Propagation.REQUIRED,

isolation = Isolation.DEFAULT,timeout = 20 ,

rollbackFor = {NullPointerException. class ,NotEnoughException. class })

public void buyGoods( int goodsId, int nums)

        throws NullPointerException, NotEnoughException{

    /**生成销售的订单

      * */

    Sale sale= new Sale();

    sale.setGid(goodsId);

    sale.setNum(nums);

    saleDao.insertSale(sale);

    /**修改库存

      * */

    Goods goods=goodsDao.selectGoodsById(goodsId);

    if (goods== null ){

        throw new NullPointerException(goodsId+ "没有该商品" );

    }

    if (goods.getAmount()<nums){

        throw new NotEnoughException(goodsId+ "库存不足" );

    }

    /**操作库存

      * */

    goods.setAmount(nums);

    goodsDao.updateGoods(goods);

}