<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
? ? ? ?xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
? ? ? ?xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
? ? ? ?xsi:schemaLocation="http://www.springframework.org/schema/beans
?http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
?http://www.springframework.org/schema/tx
?http://www.springframework.org/schema/tx/spring-tx-2.0.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

<!--聲明事務(wù)管理器-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
? ? <property name="dataSource" ref="myDataSource"/>
</bean>
<!--聲明事務(wù)的注解驅(qū)動
? transaction-manager：事務(wù)管理器對象的id
-->
<tx:annotation-driven transaction-manager="transactionManager"/>

/**使用注解來設(shè)值事務(wù)的屬性(傳播行為,隔離等級,超時,當(dāng)哪些異常發(fā)生的時候觸發(fā)回滾事務(wù))
?* 注意:該注解必須使用在公有函數(shù)上，而且拋出的異常必需繼承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{
? ? /**生成銷售的訂單
? ? ?* */
? ? Sale sale=new Sale();
? ? sale.setGid(goodsId);
? ? sale.setNum(nums);
? ? saleDao.insertSale(sale);

? ? /**修改庫存
? ? ?* */
? ? Goods goods=goodsDao.selectGoodsById(goodsId);
? ? if(goods==null){
? ? ? ? throw new NullPointerException(goodsId+"沒有該商品");
? ? }
? ? if(goods.getAmount()<nums){
? ? ? ? throw new NotEnoughException(goodsId+"庫存不足");
? ? }

? ? /**操作庫存
? ? ?* */
? ? goods.setAmount(nums);
? ? goodsDao.updateGoods(goods);
}