即以游客身份登錄網(wǎng)站時以cookie的方式存儲購物車，而以登錄用戶的身份進入時將購物車信息存儲到數(shù)據(jù)庫中去，若是先以游客身份完成購物再登錄繼續(xù)購物，則將cookies購物車存入數(shù)據(jù)庫；
其中涉及到的存儲過程主要如下：
一：已登錄會員添加商品到購物車功能：
復制代碼 代碼如下:
/* @store_sum表示要添加的商品數(shù)量,添加同時確認購物車中自己已有的數(shù)量與將要加入的數(shù)量之和是否超過庫存 */
CREATE proc ncp_Cart_Add
(
@store_id int,
@store_sum int=1,
@member_id int
)
as
DECLARE @Amount int
DECLARE @NowAmount int
Begin
select @Amount=(select amount from ncp_store where id=@store_id)
IF EXISTS(SELECT 1 FROM [ncp_cart] WHERE store_id=@store_id and member_id=@member_id)
Begin
select @NowAmount=(select store_sum+@store_sum from ncp_cart WHERE store_id=@store_id and member_id=@member_id)
if @NowAmount>@Amount
return 0
else
UPDATE [ncp_cart] SET store_sum=store_sum+@store_sum,addtime=getDate() where store_id=@store_id and member_id=@member_id
return 1
End
ELSE
Begin
select @NowAmount=(select store_sum from ncp_cart WHERE store_id=@store_id and member_id=@member_id)
if @NowAmount>@Amount
return 0
else
INSERT INTO [ncp_cart](store_id,store_sum,member_id) values(@store_id,@store_sum,@member_id)
return 1
END
End
GO
二：購物車的刪除功能
復制代碼 代碼如下:
/* type 為1是全部刪 0時只刪一個 */
CREATE PROCEDURE ncp_Cart_Del
@type int=0,
@store_id int ,
@member_id int
AS
begin
if @type=0
delete from [ncp_cart] where store_id=@store_id and member_id=@member_id
else
delete from [ncp_cart] where member_id=@member_id
End
GO
