insert ignore into mall_product (`item_id`,`item_url`,`title`,`pic_url`,`price`,`month_sale`,`stock`,`shop_id`,`seller_id`) values (#{itemId},#{itemUrl},#{title},#{picUrl},#{price},#{monthSale},#{stock},#{shopId},#{sellerId}) update mall_product set stock=stock-#{num} where item_id=#{itemId} update mall_product set stock=stock+#{num} where item_id=#{itemId} select * from mall_product order by id desc limit 12 select * from mall_product where item_id=#{itemId}