疑问一：针对以下代码
Shop tempShop = shopDao.queryByShopId(shop.getShopId());
if (tempShop.getShopImg() != null) {
ImageUtil.deleteFileOrPath(tempShop.getShopImg());
}
上面这段代码可以修改吗？第一行删掉，另外两行修改如下，可以达到精简的效果：
if (shop.getShopImg()!=null){
ImageUtil.deleteFileOrPath(shop.getShopImg());
}

疑问二：针对以下代码
//2.更新店铺信息
shop.setLastEditTime(new Date());
int effetedNum = shopDao.updateShop(shop);
if (effetedNum <= 0) {
return new ShopExecution(ShopStateEnum.INNER_ERROR);
} else {
shop=shopDao.queryByShopId(shop.getShopId());
return new ShopExecution(ShopStateEnum.SUCCESS, shop);
}
如果出现effetedNum <= 0成立，事务将不会回退，返回一个ShopExecution对象，而此时店铺图片已换、但数据库中图片名称未修改成功，怎么办？另外，倒数第二行的代码（ shop=shopDao.queryByShopId(shop.getShopId());）是不是没有必要？