id,user_id,business_id,goods_id,num select cart.*, business.name as businessName, goods.img as goodsImg, goods.name as goodsName, goods.price as goodsPrice, goods.unit as goodUnit from cart left join business on cart.business_id = business.id left join goods on cart.goods_id = goods.id and id= #{id} and user_id = #{userId} and business_id = #{businessId} and goods_id = #{goodsId} and num = #{num} select from cart where id = #{id} delete from cart where id = #{id} insert into cart id, user_id, business_id, goods_id, num, #{id}, #{userId}, #{businessId}, #{goodsId}, #{num}, update cart user_id = #{userId}, business_id = #{businessId}, goods_id = #{goodsId}, num = #{num}, where id = #{id}