將數據添加到數據庫的部分（asp.net）

Question

我有幾頁預訂和每頁保存數據。例如，第一頁將目的地添加到數據庫，第二頁選擇乘客數量。

我有一個表來存儲所有這一切：

CREATE TABLE [dbo].[Transactions] (
[cardNumber ] NCHAR (10) NULL, 
[Cost]  NCHAR (10) NULL, 
[Passengers] NCHAR (10) NULL, 
[Destination] NCHAR (10) NULL 
); 

在目標頁面，我用下面的代碼輸入目的地到數據庫：

protected void Button2_Click1(object sender, EventArgs e) 
{ 
    try 
    { 
     SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["DatabaseConnectionString"].ConnectionString); 

     conn.Open(); 
     string insert = "insert into Transactions (Destination) values (@Destination)"; 

     SqlCommand com = new SqlCommand(insert, conn); 

     com.Parameters.AddWithValue("@Destination", DropDownList1.SelectedItem); 

     com.ExecuteNonQuery(); 
     conn.Close(); 
    } 
    catch (Exception ex) 
    { 
     Response.Write("Error: " + ex.ToString()); 
    } 

    Response.Redirect("Booking.aspx"); 
} 

在接下來的頁面我有相對相同的代碼輸入乘客數量：

protected void Button2_Click(object sender, EventArgs e) 
{ 
    try 
    { 
     SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["DatabaseConnectionString"].ConnectionString); 

     conn.Open(); 

     string insert = "insert into Transactions (Passengers) values (@Passengers)"; 

     SqlCommand com = new SqlCommand(insert, conn); 
     com.Parameters.AddWithValue("@Passengers", DropDownList1.SelectedItem); 

     com.ExecuteNonQuery(); 
     conn.Close(); 
    } 
    catch(Exception ex) 
    { 
     Response.Write("Error: " + ex.ToString()); 
    } 

    Response.Redirect("Payment.aspx"); 

} 

但做完這個沒有d ata進入數據庫。如果有人知道我可以一次將數據輸入數據庫，請告訴我。

如果不能這樣做，並有一個更好的方式做到這一點，請讓我知道。

謝謝大家的時間。

Answer 1

你應該在你的表上有一個專用主​​鍵列，我推薦一個自動增量整數。

CREATE TABLE [dbo].[Transactions] 
(
    [ID]   INT NOT NULL PRIMARY KEY IDENTITY(1,1), 
    [CardNumber] NCHAR (10) NULL, 
    [Cost]  NCHAR (10) NULL, 
    [Passengers] NCHAR (10) NULL, 
    [Destination] NCHAR (10) NULL 
); 

然後，使用存儲過程，而不是臨時SQL。

CREATE PROCEDURE TransactionSave 
(
    @ID int = null, 
    @CardNumber nchar(10) = null, 
    @Cost nchar(10) = null, 
    @Passengers nchar(10) = null, 
    @Destination nchar(10) = null 
) 
AS 
BEGIN 

DECLARE @ExistingID int 
SELECT @ExistingID = ID FROM Transaction WHERE ID = @ID 

IF @ExistingID is null 
BEGIN 
    --Insert 
    INSERT INTO Transaction (CardNumber, Cost, Passengers, Destination) 
    VALUES (@CardNumber, @Cost, @Passengers, @Destination) 

    SELECT CAST(SCOPE_IDENTITY() AS INT) AS 'TransactionID' 
END 
ELSE 
BEGIN 
    --Update 
    UPDATE Transaction 
    SET 
     CardNumber = ISNULL(@CardNumber, CardNumber), 
     Cost = ISNULL(@Cost, Cost), 
     Passengers = ISNULL(@Passengers, Passengers), 
     Destination = ISNULL(@Destination, Destination), 
    WHERE ID = @ExistingID 

    SELECT @ExistingID AS 'TransactionID' 
END 

END 

然後，在後面的代碼，你需要保留你正在從事的交易的ID值，以確保您更新正確的行：

protected void Button2_Click(object sender, EventArgs e) 
{ 
    int transactionID = hfID.Value; 

    try 
    { 
     using(SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["DatabaseConnectionString"].ConnectionString)) 
     { 
      SqlCommand cmd = new SqlCommand("TransactionSave", conn); 

      cmd.Parameters.AddWithValue("@ID", transactionID); 
      cmd.Parameters.AddWithValue("@Passengers", DropDownList1.SelectedValue); 

      transactionID = cmd.ExecuteScalar(); 
      hfID.Value = transactionID; 
     } 
    } 
    catch(Exception ex) 
    { 
     Response.Write("Error: " + ex.ToString()); 
    } 
}