@limuyan44 代码有好几层，那我贴一下
MiaoshaController.java
@RequestMapping(value=”/do_miaosha”, method= RequestMethod.POST)
@ResponseBody
public Result<OrderInfo> miaosha(Model model,MiaoshaUser user,
@RequestParam(“goodsId”)long goodsId) {
model.addAttribute(“user”, user);
if(user == null) {
return Result.error(CodeMsg.SESSION_ERROR);
}
//判断库存
GoodsVo goods = goodsService.getGoodsVoByGoodsId(goodsId);//10 个商品，req1 req2
int stock = goods.getStockCount();
if(stock <= 0) {
return Result.error(CodeMsg.MIAO_SHA_OVER);
}
//判断是否已经秒杀到了
MiaoshaOrder order = orderService.getMiaoshaOrderByUserIdGoodsId(user.getId(), goodsId);
if(order != null) {
return Result.error(CodeMsg.REPEATE_MIAOSHA);
}
//减库存 下订单 写入秒杀订单
OrderInfo orderInfo = miaoshaService.miaosha(user, goods); //我提问的操作在这个函数里面
return Result.success(orderInfo);
}
MiaoshaService.java 中，上文的 miaoshaService.miaosha
@Transactional
public OrderInfo miaosha(MiaoshaUser user, GoodsVo goods) {
//减库存 下订单 写入秒杀订单
goodsService.reduceStock(goods);
//order_info maiosha_order
return orderService.createOrder(user, goods);
}
GoodsService.java 中，上文的 goodsService.reduceStock
public void reduceStock(GoodsVo goods) {
MiaoshaGoods g = new MiaoshaGoods();
g.setGoodsId(goods.getId());
goodsDao.reduceStock(g);
}
GoodsDao.java 中，上文的 goodsDao.reduceStock
@Update(“update miaosha_goods set stock_count = stock_count – 1 where goods_id = #{goodsId} and stock_count > 0”)
public int reduceStock(MiaoshaGoods g);
OrderService 上上上段代码最后一句，中的 orderService.createOrder
@Transactional
public OrderInfo createOrder(MiaoshaUser user, GoodsVo goods) {
OrderInfo orderInfo = new OrderInfo();
orderInfo.setCreateDate(new Date());
orderInfo.setDeliveryAddrId(0L);
orderInfo.setGoodsCount(1);
orderInfo.setGoodsId(goods.getId());
orderInfo.setGoodsName(goods.getGoodsName());
orderInfo.setGoodsPrice(goods.getMiaoshaPrice());
orderInfo.setOrderChannel(1);
orderInfo.setStatus(0);
orderInfo.setUserId(user.getId());
long orderId = orderDao.insert(orderInfo);
System.out.println();
MiaoshaOrder miaoshaOrder = new MiaoshaOrder();
miaoshaOrder.setGoodsId(goods.getId());
miaoshaOrder.setOrderId(orderId);
miaoshaOrder.setUserId(user.getId());
orderDao.insertMiaoshaOrder(miaoshaOrder);
redisService.set(OrderKey.getMiaoshaOrderByUidGid, “”+user.getId()+”_”+goods.getId(), miaoshaOrder);
return orderInfo;
}
我觉得这两句话虽然在一个事务里，但是第一句里用了 where，虽然库存已经没了，但是没有报异常，导致 return 那句的订单还是可以生成。
//减库存 下订单 写入秒杀订单
goodsService.reduceStock(goods);
//order_info maiosha_order
return orderService.createOrder(user, goods);