通过

SqlDataSourceView.DeleteCommand 属性

  • 参考

定义

命名空间:
System.Web.UI.WebControls
程序集:
System.Web.dll

获取或设置 SqlDataSourceView 对象用于从基础数据库中删除数据的 SQL 字符串。

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

属性值

String

SqlDataSourceView 删除数据所用的 SQL 字符串。

示例

下面的代码示例演示如何设置 DeleteCommand 文本以从 Northwind 数据库 Orders 表中删除订单。 数据从 Orders 表中检索并显示在 控件中 GridView 。 GridView当 属性设置为 true 时AutoGenerateDeleteButton， 将自动呈现一个“删除”按钮，并在单击“删除”按钮时自动填充DeleteParameters集合并调用 Delete 方法。 最后，由于此示例删除数据，因此添加了一个事件处理程序，以尝试在执行删除操作之前将数据库备份到磁盘。

<%@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>

注解

由于不同的数据库产品使用不同类型的 SQL，因此 SQL 字符串的语法取决于当前正在使用的 ADO.NET 提供程序，该提供程序由 ProviderName 属性标识。

如果 SQL 字符串是一个参数化查询或命令，则参数的占位符还取决于所使用的 ADO.NET 提供程序。 例如，如果提供程序是 System.Data.SqlClient，这是 类的默认提供程序 SqlDataSource ，则 参数的占位符为 '@parameterName'。 但是，如果提供程序设置为 System.Data.Odbc 或 System.Data.OleDb，则参数的占位符为 '?'。 有关参数化 SQL 查询和命令的详细信息，请参阅 对 SqlDataSource 控件使用参数。

DeleteCommand可以是 SQL 字符串，也可以是存储过程的名称（如果基础数据库支持存储过程）。

属性的值 DeleteCommand 存储在视图状态中。

适用于

另请参阅