购物车-ShoppingCart-数据层

CREATE TABLE [dbo].[ShoppingCart](
[CartID] [char](36) COLLATE Chinese_PRC_CI_AS NOT NULL,
[ProductID] [int] NOT NULL,
[Quantity] [int] NULL,
[DateAdded] [smalldatetime] NULL,
CONSTRAINT [PK_ShoppingCart] PRIMARY KEY CLUSTERED
(
[CartID] ASC,
[ProductID] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

GO
SET ANSI_PADDING OFF
GO
USE [BalloonShop]
GO
ALTER TABLE [dbo].[ShoppingCart]  WITH CHECK ADD  CONSTRAINT [FK_ShoppingCart_Product] FOREIGN KEY([ProductID])
REFERENCES [dbo].[Product] ([ProductID])

CREATE PROCEDURE [dbo].[ShoppingCartAddItem]
(@CartID char(36),
@ProductID int)
AS
IF EXISTS
(SELECT CartID
FROM ShoppingCart
WHERE ProductID = @ProductID AND CartID = @CartID)
UPDATE ShoppingCart
SET Quantity = Quantity + 1
WHERE ProductID = @ProductID AND CartID = @CartID
ELSE
IF EXISTS (SELECT Name FROM Product WHERE ProductID = @ProductID)
INSERT INTO ShoppingCart (CartID, ProductID, Quantity, DateAdded)
VALUES (@CartID, @ProductID, 1, GETDATE())

CREATE PROCEDURE ShoppingCartRemoveItem
(@CartID char(36),
@ProductID int)
AS
DELETE FROM ShoppingCart
WHERE ProductID = @ProductID AND CartID = @CartID

CREATE PROCEDURE ShoppingCartUpdateItem
(@CartID char(36),
@ProductID int,
@Quantity int)
AS
IF @Quantity <= 0
EXEC ShoppingCartRemoveItem @CartID,@ProductID
ELSE
UPDATE ShoppingCart
SET Quantity = @Quantity,DateAdded = GETDATE()
WHERE ProductID = @ProductID AND CartID = @CartID

CREATE PROCEDURE ShoppingCartGetItems
(@CartID char(36))
AS
SELECT Product.ProductID,Product.Name,Product.Price,ShoppingCart.Quantity,
Product.Price * ShoppingCart.Quantity AS Subtotal
FROM ShoppingCart INNER JOIN Product
ON ShoppingCart.ProductID = Product.ProductID
WHERE ShoppingCart.CartID = @CartID

CREATE PROCEDURE ShoppingCartTotalAmount
(@CartID char(36))
AS
SELECT ISNULL(SUM(Product.Price * ShoppingCart.Quantity),0)
FROM ShoppingCart INNER JOIN Product
ON ShoppingCart.ProductID = Product.ProductID
WHERE ShoppingCart.CartID = @CartID