SpringBoot事务的简单运用

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参考文章1：https://blog.youkuaiyun.com/qq_34337272/article/details/80394121
参考文章2：https://www.cnblogs.com/jinjian91/p/10549125.html
参考文章3：https://blog.youkuaiyun.com/justry_deng/article/details/80828180

通用配置
添加下面依赖,sprongboot 会默认开启事务管理

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>

或在启动类添加

@EnableTransactionManagement

开启事务

一、声明式事务
使用事务：

@Transaction
public void test(String userName){
    //...
}

捕获到异常将自动进行回滚，其只能捕获到运行时异常

spring事务失效的几种场景https://blog.youkuaiyun.com/Jiangbohao_/article/details/107182301

@Transactional 注解参数详解https://blog.youkuaiyun.com/weixin_44259720/article/details/110138972

二、编程式事务
使用事务：
在需要的服务类里添加：

	//事务使用的接口
    @Resource
    DataSourceTransactionManager dataSourceTransactionManager;
    @Resource
    TransactionDefinition transactionDefinition;

//手动开启事务！
TransactionStatus transactionStatus = dataSourceTransactionManager.getTransaction(transactionDefinition);

//事务回滚
//最好是放在catch 里面,防止程序异常而事务一直卡在哪里未提交
dataSourceTransactionManager.rollback(transactionStatus);
//提交事务
dataSourceTransactionManager.commit(transactionStatus);

伪代码仅供参考：

@Service
public class OrderMainService {

    //事务使用的接口
    @Resource
    DataSourceTransactionManager dataSourceTransactionManager;
    @Resource
    TransactionDefinition transactionDefinition;


    @Resource
    OrderGoodsMapper orderGoodsMapper;
    @Resource
    UserCartMapper userCartMapper;
    @Resource
    GoodsInfoMapper goodsInfoMapper;
    @Resource
    private OrderMainMapper orderMainMapper;

    public CommonResult<Integer> addOrder(OrderData orderData) {

        //手动开启事务！
        TransactionStatus transactionStatus = dataSourceTransactionManager.getTransaction(transactionDefinition);

        //遍历，判断商品库存是否充足
        for (OrderGoods orderGoods : orderData.getOrderGoodsList()) {
            //订购数量
            int goodsCount;
            //查询商品信息
            GoodsInfo goodsInfo;
            //判断物品库存是否充足
            if (goodsInfo.getGoodsRemainCount() - goodsCount >= 0) {
                //更新商品库存信息
                goodsInfo.setGoodsRemainCount(goodsInfo.getGoodsRemainCount() - goodsCount);
                goodsInfoMapper.editGoods(goodsInfo);
            } else {
                //事务回滚
                dataSourceTransactionManager.rollback(transactionStatus);
                //订单中只要有一项商品库存不足就取消订单
                return new CommonResult<>("商品库存不足", null);
            }
        }

        //订单中所有商品库存都足够则更新数据库中商品信息
        //提交事务
        dataSourceTransactionManager.commit(transactionStatus);

        //...
        Integer influence = new Integer(1);
        return new CommonResult<>("success",influence);
    }
}