动态增删改查

      <asp:gridview id="CustomersGridView"
        datasourceid="CustomersSqlDataSource"
        autogeneratecolumns="true"
        allowpaging="true"
        onrowdatabound="CustomersGridView_RowDataBound"
        runat="server">
      </asp:gridview>

      <!-- This example uses Microsoft SQL Server and connects  -->
      <!-- to the Northwind sample database. Use an ASP.NET     -->
      <!-- expression to retrieve the connection string value   -->
      <!-- from the Web.config file.                            -->
      <asp:sqldatasource id="CustomersSqlDataSource" 
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
        runat="server">
      </asp:sqldatasource>

 

 

selectcommand="查询语句"       以及insertcommand,updatecommand,     
这个查询语句能实现动态查询吗？前提是不知道数据库有多少列 。