共用方式為

SqlDataSourceStatusEventArgs.Command 屬性

  • 參考

定義

命名空間:
System.Web.UI.WebControls
組件:
System.Web.dll

取得送出至資料庫的資料庫命令。

public:
 property System::Data::Common::DbCommand ^ Command { System::Data::Common::DbCommand ^ get(); };
public System.Data.Common.DbCommand Command { get; }
member this.Command : System.Data.Common.DbCommand
Public ReadOnly Property Command As DbCommand

屬性值

DbCommand

DbCommand 物件，表示送出至資料庫的資料庫命令。

範例

下列程式碼範例示範如何在搭配預存程式使用 SqlDataSource 控制項時檢查輸出參數的值。 SelectParameters集合包含預存程式所使用的參數 SqlDataSource ，並且包含將資訊從 Web 表單傳遞至預存程式的參數，以及將資訊傳回表單的參數所組成。 此程式碼範例是提供給 類別之較大範例的 SqlDataSourceStatusEventArgs 一部分。

<%@Page  Language="C#" %>
<%@Import Namespace="System.Data" %>
<%@Import Namespace="System.Data.Common" %>
<%@Import Namespace="System.Data.SqlClient" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
// Clicking the Submit button explicitly refreshes the data 
// by calling the Select() method.
private void Submit(Object source, EventArgs e) {
  SqlDataSource1.Select(DataSourceSelectArguments.Empty);
}

// This event handler is called after the Select() method is executed.
private void OnSelectedHandler(Object source, SqlDataSourceStatusEventArgs e) {

  IDbCommand cmd = e.Command; 
  
  Label1.Text = "Parameter return values: ";

  foreach (SqlParameter param in cmd.Parameters) {
    //  Extract the value of the parameter.
    Label1.Text += param.ParameterName + " - " + param.Value.ToString();
  }
}
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>ASP.NET Example</title>
</head>
<body>
    <form id="form1" runat="server">
        <asp:sqldatasource
            id="SqlDataSource1"
            runat="server"
            datasourcemode="DataSet"
            connectionstring="<%$ ConnectionStrings:MyNorthwind%>"
            selectcommand="getordertotal"
            onselected="OnSelectedHandler">
            <selectparameters>
              <asp:querystringparameter name="empId" querystringfield="empId" />
              <asp:parameter name="total" type="Int32" direction="Output" defaultvalue="0" />
              <asp:parameter name="_ret" type="Int32" direction="ReturnValue" defaultvalue="0" />
            </selectparameters>
        </asp:sqldatasource>
        <!--
          CREATE PROCEDURE dbo.getordertotal
            @empId int,
            @total int OUTPUT
          as
            set nocount on
            select @total    = count(1) from orders where employeeid=@empid;
            select * from orders where employeeID = @empId ;
            return (-1000);
          GO
        -->

        <asp:gridview
          id="GridView1"
          runat="server"
          allowpaging="True"
          pagesize="5"
          datasourceid="SqlDataSource1" />

        <asp:button
          id="Button1"
          runat="server"
          onclick="Submit"
          text="Refresh Data" />

        <asp:label id="Label1" runat="server" />

    </form>
  </body>
</html>

<%@Page  Language="VB" %>
<%@Import Namespace="System.Data" %>
<%@Import Namespace="System.Data.Common" %>
<%@Import Namespace="System.Data.SqlClient" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
' Clicking the Submit button explicitly refreshes the data 
' by calling the Select() method.
Private Sub Submit(source As Object, e As EventArgs)
  
  SqlDataSource1.Select(DataSourceSelectArguments.Empty)
  
End Sub ' Submit

' This event handler is called after the Select() method is executed.
Private Sub OnSelectedHandler(source As Object, e As SqlDataSourceStatusEventArgs)

  Dim cmd As IDbCommand 
  cmd = e.Command
  Dim param As SqlParameter
  
  Label1.Text = "Parameter return values: "
  
  For Each param In cmd.Parameters
    
    ' Extract the name and value of the parameter.
    Label1.Text = Label1.Text & param.ParameterName & " - " & _
                  param.Value.ToString()

  Next

End Sub ' OnSelectedHandler
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>ASP.NET Example</title>
</head>
<body>
    <form id="form1" runat="server">
        <asp:sqldatasource
            id="SqlDataSource1"
            runat="server"
            datasourcemode="DataSet"
            connectionstring="<%$ ConnectionStrings:MyNorthwind%>"
            selectcommand="getordertotal"
            onselected="OnSelectedHandler">
            <selectparameters>
              <asp:querystringparameter name="empId" querystringfield="empId" />
              <asp:parameter name="total" type="Int32" direction="Output" defaultvalue="0" />
              <asp:parameter name="_ret" type="Int32" direction="ReturnValue" defaultvalue="0" />
            </selectparameters>
        </asp:sqldatasource>
        <!--
          CREATE PROCEDURE dbo.getordertotal
            @empId int,
            @total int OUTPUT
          as
            set nocount on
            select @total    = count(1) from orders where employeeid=@empid;
            select * from orders where employeeID = @empId ;
            return (-1000);
          GO
        -->

        <asp:gridview
          id="GridView1"
          runat="server"
          allowpaging="True"
          pagesize="5"
          datasourceid="SqlDataSource1" />

        <asp:button
          id="Button1"
          runat="server"
          onclick="Submit"
          text="Refresh Data" />

        <asp:label id="Label1" runat="server" />

    </form>
  </body>
</html>

備註

您可以處理 Selected 、 InsertedUpdated 、 或 Deleted 事件，以檢查和操作 控制項提交至資料庫之後 SqlDataSource 的屬性 DbCommand 。 屬性 Command 可讓您在透過其 Parameters 屬性執行資料庫作業之後，存取任何輸出參數中的傳回值和值，以及 CommandText 屬性，其代表提交至資料庫的 SQL 查詢、命令或預存程式名稱。

任何輸出參數都是來自具有 InputOutput 物件屬性 Parameter 之 或 Output 值 Direction 的參數。 傳回值來自具有 ReturnValue 值的參數。

適用於

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