如何使用ADO.NET中的存儲過程在同一表中添加多行？

Question

這是我的表設計：

CREATE TABLE Member 
(
    Member_No UNIQUEIDENTIFIER DEFAULT NEWID() PRIMARY KEY, 
    Name VARCHAR(50) NOT NULL, 
    Email VARCHAR(50) NOT NULL, 
    Phone BIGINT NOT NULL, 
    Username VARCHAR(50) NOT NULL, 
    Password VARCHAR(50) NOT NULL 
) 

CREATE TABLE Toy 
(
    Toy_No UNIQUEIDENTIFIER DEFAULT NEWID() PRIMARY KEY, 
    Toy_Image VARBINARY(MAX) NOT NULL, 
    Toy_Name VARCHAR(50) NOT NULL, 
    Anime_Image VARBINARY(MAX) NOT NULL, 
    Anime_Name VARCHAR(50) NOT NULL, 
    Toy_Distributor_Image VARBINARY(MAX) NOT NULL, 
    Toy_Distributor VARCHAR(50) NOT NULL, 
    Price INTEGER NOT NULL, 
    Quantity INTEGER NOT NULL 
) 

CREATE TABLE Cart 
(
    Cart_No UNIQUEIDENTIFIER DEFAULT NEWID() PRIMARY KEY, 
    Toy_No UNIQUEIDENTIFIER NOT NULL, 
    Member_No UNIQUEIDENTIFIER NOT NULL, 
    Total_Quantity INTEGER, 
    Total_Price INTEGER, 

    CONSTRAINT FK_ToyNo 
     FOREIGN KEY(Toy_No) REFERENCES Toy(Toy_No), 
    CONSTRAINT FK_MemberNo 
     FOREIGN KEY(Member_No) REFERENCES Member(Member_No) 
) 

CREATE TABLE Toy_Purchase 
(
    Toy_Purchase_No UNIQUEIDENTIFIER DEFAULT NEWID() PRIMARY KEY, 
    Cart_No UNIQUEIDENTIFIER NOT NULL, 
    Toy_No UNIQUEIDENTIFIER NOT NULL, 
    Member_No UNIQUEIDENTIFIER NOT NULL, 
    Total_Quantity INTEGER NOT NULL, 
    Total_Price INTEGER NOT NULL, 
    Credit_Card_No BIGINT NOT NULL, 
    Purchase_Date DATETIME DEFAULT GETDATE() NOT NULL, 

    CONSTRAINT FK_CartNo 
     FOREIGN KEY(Cart_No) REFERENCES Cart(Cart_No), 
    CONSTRAINT FkToyNo 
     FOREIGN KEY(Toy_No) REFERENCES Toy(Toy_No), 
    CONSTRAINT FkMemberNo 
     FOREIGN KEY(Member_No) REFERENCES Member(Member_No) 
) 

這裏要注意的一件重要的事情是，通過存儲過程記錄在Total_Quantity價值觀和Cart表Total_Price將Total_Quantity和Toy_Purchase表Total_Price傳遞並插入所謂的PurchaseToys，我將在最後展示。

這是我的存儲過程，名爲AddToCart，我將選擇具有一個或多個數量的不同玩具，然後添加到購物車。

CREATE PROCEDURE AddToCart 
    @CartNo UNIQUEIDENTIFIER OUTPUT, 
    @ToyNo UNIQUEIDENTIFIER OUTPUT, 
    @MemberNo UNIQUEIDENTIFIER OUTPUT, 
    @TotalQuantity INTEGER, 
    @TotalPrice INTEGER OUTPUT 
AS 
BEGIN 
    SET @CartNo = NEWID() 
    SET @ToyNo = (SELECT Toy_No FROM Toy) 
    SET @MemberNo = (SELECT Member_No FROM Member) 
    SET @TotalPrice = @TotalQuantity*(SELECT Price FROM Toy WHERE Toy_No=@ToyNo) 

    INSERT INTO Cart(Cart_No, Toy_No, Member_No, Total_Quantity, Total_Price) 
    VALUES(@CartNo, @ToyNo, @MemberNo, @TotalQuantity, @TotalPrice) 
END 

這就是我所謂的DisplayCart的存儲過程，它會顯示的，我已經加入到我的購物車購買前玩具項的列表。

CREATE PROCEDURE DisplayCart 
AS 
BEGIN 
    SELECT 
     Toy_Image, Toy_Name, Total_Quantity, Total_Price 
    FROM 
     Toy, Cart 
    WHERE 
     Toy.Toy_No = Cart.Toy_No 
END 

這是我的存儲過程，名爲PurchaseToys。只有在我輸入我的信用卡號碼後，纔會執行此程序，然後單擊網站上的確認付款按鈕。

CREATE PROCEDURE PurchaseToys 
    @ToyPurhcaseNo UNIQUEIDENTIFIER OUTPUT, 
    @CartNo UNIQUEIDENTIFIER OUTPUT, 
    @ToyNo UNIQUEIDENTIFIER OUTPUT, 
    @MemberNo UNIQUEIDENTIFIER OUTPUT, 
    @TotalQuantity INTEGER OUTPUT, 
    @TotalPrice INTEGER OUTPUT, 
    @CreditCardNo BIGINT, 
    @PurchaseDate DATETIME OUTPUT 
AS 
BEGIN 
    SET @ToyPurhcaseNo = NEWID() 
    SET @CartNo = (SELECT Cart_No FROM Cart) 
    SET @ToyNo = (SELECT Toy_No FROM Toy) 
    SET @MemberNo = (SELECT Member_No FROM Member) 
    SET @TotalQuantity = (SELECT Total_Quantity FROM Cart WHERE Cart_No = @CartNo) -- I'm planning to pass the value of Total_Quantity in Toy_Purchase table from Total_Quantity of Cart table 
    SET @TotalPrice = (SELECT Total_Price FROM Cart WHERE Cart_No = @CartNo) -- I'm planning to pass the value of Total_Price in Toy_Purchase table from Total_Price of Cart table 
    SET @PurchaseDate = GETDATE() 

    INSERT INTO Toy_Purchase (Toy_Purchase_No, Cart_No, Toy_No, Member_No, Total_Quantity, Total_Price, Credit_Card_No, Purchase_Date) 
    VALUES (@ToyPurhcaseNo, @CartNo, @ToyNo, @MemberNo, @TotalQuantity, @TotalPrice, @CreditCardNo, @PurchaseDate) 

    UPDATE Toy 
    SET Quantity = Quantity - Total_Price 
    FROM Toy, Toy_Purchase 
    WHERE Toy.Toy_No = Toy_Purchase.Toy_No 
END 

一般來說，如果你看一下所謂的PurchaseToys此存儲過程的邏輯，它會在Toy_Purchase表只插入一行和Toy表Quantity列值將減少爲只有單一的玩具。

但是，我想根據我選擇的玩具數量在Toy_Purchase表中插入多行。例如，如果我購買了2種不同的玩具，則存儲過程應在Toy_Purchase表中插入2行，Toy表中的Quantity列值將減少2個不同的玩具。

如果我購買了4種不同的玩具，存儲過程應該在Toy_Purchase表中插入4行，玩具表中的Quantity列值將針對4種不同的玩具減少。

那麼如何確保在Toy_Purchase表中插入多行，並且通過ADO.NET中的存儲過程可以減少不同選定玩具數量的Quantity列值？

Answer 1

如果你想避免爲每一行調用存儲過程，你可以選擇很少的選項。

您可以使用C＃中的SQLBulkCopy方法，您可以將數據作爲參數傳遞給表。 如果您仍希望讓存儲過程在數據級別執行其餘操作（您仍然可以更新數量列），請使用可將數據表作爲參數傳遞給存儲過程的表值參數。

SQL：

CREATE PROCEDURE [PurchaseToys] 
    @tblPurchaseOrders Toy_Purchase READONLY AS 
BEGIN 
    SET NOCOUNT ON; 

    INSERT INTO Toy_Purchase(column1, column2, ..) 
     SELECT 
      column1, column2,.. 
     FROM @tblPurchaseOrders 

     --Do what else you want to do here.. 
END 

C＃：

using (SqlConnection con = new SqlConnection(Connectionstring)) 
{ 
    using (SqlCommand cmd = new SqlCommand("PurchaseToys")) 
    { 
     cmd.CommandType = CommandType.StoredProcedure; 
     cmd.Connection = con; 

     cmd.Parameters.AddWithValue("@tblPurchaseOrders", dt); // dt -> data to be inserted 

     con.Open(); 
     cmd.ExecuteNonQuery(); 
     con.Close(); 
    } 
} 

另一種選擇是循環通過在C＃中的每個記錄，並調用存儲過程。