如何通過在C＃列表下拉到存儲過程在SQLSERVER的價值

Question

我有一個表：

和乘以最後的結果如下：

一程序的定義如下：（必須將下拉列表的值與數據庫中的值相乘，然後將它們水平相加，並在最終結果中顯示resault。

CREATE PROCEDURE [dbo].[Cstored]  
AS 
BEGIN 
    SET NOCOUNT ON; 
DECLARE @Ta int 
DECLARE @Em int 
DECLARE @Ma int 
DECLARE @Sa int 

SET @Em = 8 >>>> need to be set by user selection in dropdows list 
SET @Ta= 6  >>>> need to be set by user selection in dropdows list 
SET @Sa= 5  >>>> need to be set by user selection in dropdows list 
SET @Ma = 7 >>>> need to be set by user selection in dropdows list 

SELECT 
    Namec, 
    Tar*@Ta AS val1, 
    Emk*@Em as val2, 
    Mas*@Ma as val3, 
    San*@Sa As val4, 
    (Tar*@Ta)+(Emk*@Em)+(Mas*@Ma)+(San*@Sa) as finalresult 
FROM Cdetail 
END 

正如你可以在屏幕截圖中看到的那樣，它在數據庫中運行良好，但是該值已在手動設置中。我希望它通過用戶選擇來設置。

SET @Em = 8 

它是數據庫，但我創建了ASP網頁一些下拉列表，以便用戶如下選擇值：

<form id="form1" runat="server"> 
     <asp:DropDownList ID="DropDownList1" runat="server" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" > 
      <asp:ListItem Value="@Em">Emk</asp:ListItem> 
      <asp:ListItem Value="@Ta">Tar</asp:ListItem> 
      <asp:ListItem Value="@Sa">San</asp:ListItem> 
      <asp:ListItem Value="@Ma">Mas</asp:ListItem> 
     </asp:DropDownList> 
     <br /> 
     <asp:DropDownList ID="DropDownList2" runat="server" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged"> 
      <asp:ListItem Value="@Em">Emk</asp:ListItem> 
      <asp:ListItem Value="@Ta">Tar</asp:ListItem> 
      <asp:ListItem Value="@Sa">San</asp:ListItem> 
      <asp:ListItem Value="@Ma">Mas</asp:ListItem> 
     </asp:DropDownList> 
     <br /> 
     <asp:DropDownList ID="DropDownList3" runat="server" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged"> 
      <asp:ListItem Value="@Em">Emk</asp:ListItem> 
      <asp:ListItem Value="@Ta">Tar</asp:ListItem> 
      <asp:ListItem Value="@Sa">San</asp:ListItem> 
      <asp:ListItem Value="@Ma">Mas</asp:ListItem> 
     </asp:DropDownList> 
     <br /> 
     <asp:DropDownList ID="DropDownList4" runat="server" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged"> 
      <asp:ListItem Value="@Em">Emk</asp:ListItem> 
      <asp:ListItem Value="@Ta">Tar</asp:ListItem> 
      <asp:ListItem Value="@Sa">San</asp:ListItem> 
      <asp:ListItem Value="@Ma">Mas</asp:ListItem> 
     </asp:DropDownList> 

每個下拉菜單需要有一個默認值如下：

DropDownList1.SelectedValue = 8; 
DropDownList2.SelectedValue = 7; 
DropDownList3.SelectedValue = 6; 
DropDownList4.SelectedValue = 5; 

這意味着下拉1中選擇的值必須發送到存儲過程的數字8（DD2數字7等等），然後設置變量然後乘以相關的v在數據庫中。 ，之後從上到下顯示gridview中finalresult的值。

我試着用下面的代碼，但它不起作用，我不知道如何發送下拉值來存儲過程，並根據選擇提供每個項目。

protected void Button1_Click(object sender, EventArgs e) 
     { 
      DropDownList1.SelectedValue = 8; 
      DropDownList2.SelectedValue = 7; 
      DropDownList3.SelectedValue = 6; 
      DropDownList4.SelectedValue = 5; 

      SqlConnection sqlCon = new SqlConnection(System.Configuration.ConfigurationManager.AppSettings["carConnectionString"]); 
      sqlCon.Open(); 
      SqlCommand scCommand = new SqlCommand("Carstored", sqlCon); 
      scCommand.CommandType = CommandType.StoredProcedure; 
      scCommand.Parameters.AddWithValue("????", DropDownList1); 
      scCommand.Parameters.AddWithValue("????", DropDownList2); 
      scCommand.Parameters.AddWithValue("????", DropDownList3); 
      scCommand.Parameters.AddWithValue("????", DropDownList4); 
      using (SqlDataAdapter sda = new SqlDataAdapter(scCommand)) 
      { 
       DataTable dt = new DataTable(); 
       sda.Fill(dt); 
       GridView1.DataSource = dt; 
       GridView1.DataBind(); 

我想，如果用戶在dropdow 1選擇Emk，8數相乘（X）至所有Emk的值在表，並且如果用戶在dropdow 2選擇Tar，7數相乘（X），將值表中的所有Tar。

Answer 1

您無需在存儲過程中聲明變量，聲明參數：

CREATE PROCEDURE [dbo].[Cstored]  
(
    @Ta int, 
    @Em int, 
    @Ma int, 
    @Sa int 
) 
AS 
BEGIN 
    SET NOCOUNT ON; 

    SELECT 
    Namec, 
    Tar*@Ta AS val1, 
    Emk*@Em as val2, 
    Mas*@Ma as val3, 
    San*@Sa As val4, 
    (Tar*@Ta)+(Emk*@Em)+(Mas*@Ma)+(San*@Sa) as finalresult 
    FROM Cdetail 
END 

然後，在你的C＃代碼，做這樣的事情：

DataTable dt; 
using(var sqlCon = new SqlConnection(System.Configuration.ConfigurationManager.AppSettings["carConnectionString"])) 
{ 
    sqlCon.Open(); 
    using(var scCommand = new SqlCommand("Carstored", sqlCon)) 
    { 
     scCommand.CommandType = CommandType.StoredProcedure; 
     scCommand.Parameters.Add("@Ta", SqlDbType.Int).Value = DropDownList1.SelectedValue; 
     scCommand.Parameters.Add("@Em", SqlDbType.Int).Value = DropDownList2.SelectedValue; 
     scCommand.Parameters.Add("@Ma", SqlDbType.Int).Value = DropDownList3.SelectedValue; 
     scCommand.Parameters.Add("@Sa", SqlDbType.Int).Value = DropDownList4.SelectedValue; 
     using (SqlDataAdapter sda = new SqlDataAdapter(scCommand)) 
     { 
      dt = new DataTable(); 
      sda.Fill(dt); 
     } 
    } 
}