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SqlDataSourceView.DeleteCommand 屬性

  • 參考

定義

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

取得或設定 SQL 字串，SqlDataSourceView 會用來刪除基礎資料庫的資料。

public:
 property System::String ^ DeleteCommand { System::String ^ get(); void set(System::String ^ value); };
public string DeleteCommand { get; set; }
member this.DeleteCommand : string with get, set
Public Property DeleteCommand As String

屬性值

String

SQL 字串，SqlDataSourceView 會用來刪除資料。

範例

下列程式碼範例示範如何設定 DeleteCommand 文字，以從 Northwind 資料庫 Orders 資料表中刪除訂單。 資料是從 Orders 資料表擷取，並顯示在 控制項中 GridView 。 當 屬性設定為 true 時，會自動 AutoGenerateDeleteButtonGridView 轉譯Delete按鈕，並在按一下 [刪除] 按鈕時自動填 DeleteParameters 入集合並呼叫 Delete 方法。 最後，由於此範例會刪除資料，因此會新增事件處理常式，以在執行刪除作業之前，嘗試將資料庫備份至磁片。

<%@Page  Language="C#" %>
<%@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">
private void OnRecordDeleting(Object source, SqlDataSourceCommandEventArgs e) {    
    // Cancel the delete operation if the checkbox is not checked.
    if (! CheckBox1.Checked) {
        e.Cancel = true;
        Label1.Text = "The command was cancelled because the CheckBox was not checked.";
    }
 }

private void OnRecordDeleted(object source, SqlDataSourceStatusEventArgs e) {
    Label1.Text = e.AffectedRows + " row(s) were deleted";
}
</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="SELECT * FROM Orders"            
            DeleteCommand="DELETE FROM [Order Details] WHERE OrderID=@OrderID;DELETE FROM Orders WHERE OrderID=@OrderID;"
            OnDeleting="OnRecordDeleting"
            OnDeleted="OnRecordDeleted">
        </asp:SqlDataSource>
        <br />
       <asp:CheckBox 
         id="CheckBox1" 
         runat="server"
         autopostback="true"
         text="Check To Delete Data" />
        <br />
        <br />

        <asp:GridView
            id="GridView1"
            runat="server"
            AutoGenerateColumns="False"
            DataKeyNames="OrderID"
            AutoGenerateDeleteButton="True"
            AllowPaging="True"
            PageSize="20"
            DataSourceID="SqlDataSource1">
            <Columns>
                <asp:BoundField HeaderText="Order ID" DataField="OrderID" />
                <asp:BoundField HeaderText="Customer" DataField="CustomerID" />
                <asp:BoundField HeaderText="Order Placed" DataField="OrderDate" />
                <asp:BoundField HeaderText="Order Shipped" DataField="ShippedDate" />
            </Columns>
        </asp:GridView>

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

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

<%@Page  Language="VB" %>
<%@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">
 Sub On_Record_Deleting(ByVal source As Object, ByVal e As SqlDataSourceCommandEventArgs)
     ' Cancel the delete operation if the checkbox is not checked.
     If Not CheckBox1.Checked 
            e.Cancel = True
            Label1.Text = "The command was cancelled because the CheckBox was not checked."
     End If

End Sub 'On_Record_Deleting

Sub On_Record_Deleted(ByVal source As Object, ByVal e As SqlDataSourceStatusEventArgs)
    Label1.Text = e.AffectedRows & " row(s) were deleted"

End Sub
    
</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="SELECT * FROM Orders"
            DeleteCommand="DELETE FROM [Order Details] WHERE OrderID=@OrderID;DELETE FROM Orders WHERE OrderID=@OrderID;"
            OnDeleting="On_Record_Deleting"
            OnDeleted="On_Record_Deleted">
        </asp:SqlDataSource>
        <br />

       <asp:CheckBox 
         id="CheckBox1" 
         runat="server"
         autopostback="true"
         text="Check To Delete Data" />
        <br />
        <br />

        <asp:GridView
            id="GridView1"
            runat="server"
            AutoGenerateColumns="False"
            DataKeyNames="OrderID"
            AutoGenerateDeleteButton="True"
            AllowPaging="True"
            PageSize="20"
            DataSourceID="SqlDataSource1">
            <Columns>
                <asp:BoundField HeaderText="Order ID" DataField="OrderID" />
                <asp:BoundField HeaderText="Customer" DataField="CustomerID" />
                <asp:BoundField HeaderText="Order Placed" DataField="OrderDate" />
                <asp:BoundField HeaderText="Order Shipped" DataField="ShippedDate" />
            </Columns>
        </asp:GridView>

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

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

備註

由於不同的資料庫產品使用不同的 SQL，SQL 字串的語法須視目前所使用的 ADO.NET 提供者 (可由 ProviderName 屬性識別) 而定。

如果 SQL 字串是參數型查詢或命令，參數的替代符號亦須視目前所使用的 ADO.NET 提供者而定。 例如，如果提供者是 System.Data.SqlClient ，這是類別的預設提供者 SqlDataSource ，則參數的預留位置為 '@parameterName' 。 不過，如果提供者設定 System.Data.Odbc 為 或 System.Data.OleDb ，則 參數的預留位置為 '?' 。 如需參數化 SQL 查詢和命令的詳細資訊，請參閱 搭配 SqlDataSource 控制項使用參數。

如果基礎資料庫支援預存程式，則 DeleteCommand 可以是 SQL 字串或預存程式的名稱。

屬性的值 DeleteCommand 會儲存在檢視狀態中。

適用於

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