ShoppingCart

代码

1 CREATE TABLE [dbo].ShoppingCart
2 (
3 CartID INT IDENTITY(1,1) NOT NULL PRIMARY KEY,
4 UserID INT NOT NULL,
5 ProductID INT NOT NULL,
6 Quantity INT NOT NULL
7 )
8 GO
9
10 CREATE PROC AddToShoppingCart
11 (
12 @UserID INT,
13 @ProductID INT
14 )
15 AS
16 DECLARE @ProductName VARCHAR(100),@UnitPrice MONEY
17 IF EXISTS(SELECT * FROM ShoppingCart WHERE ProductID = @ProductID AND UserID = @UserID)
18 BEGIN
19 UPDATE
20 ShoppingCart
21 SET
22 Quantity = Quantity + 1
23 WHERE
24 ProductID = @ProductID
25 AND
26 UserID = @UserID
27 END
28 ELSE
29 BEGIN
30 SELECT
31 @ProductName = ProductName,@UnitPrice = UnitPrice
32 FROM
33 Product
34 WHERE
35 ProductID = @ProductID
36
37 INSERT INTO ShoppingCart(UserID,ProductID,Quantity) VALUES(@UserID,@ProductID,1)
38 END
39 GO