3層代碼的asp.net中的sqldatasource不支持更新

Question

我使用3層代碼隱藏和存儲過程來更新gridview。 我在顯示時遇到麻煩，（ 除非指定了UpdateCommand，否則數據源'SqlDataSource2'不支持更新。 ）但是對數據庫進行了更新。 這是我的代碼

<asp:gridview runat="server" AutoGenerateColumns="False" CellPadding="4" OnRowCommand = "GVEditRate_Command"
    ForeColor="#333333" GridLines="None" ID="GVEditRate" OnRowUpdating ="GVEditRate_OnRowUpdating"
    DataSourceID="SqlDataSource2" >

....

    SelectCommand="SELECT [Bill_Item], [Rate_Cat_Id], [Item_Rate], [Professional_Charge], [Anes_Charge], [Effective_Date] FROM [Rate_M] WHERE (([Active_Flag] = @Active_Flag) AND ([Bill_Item] = @Bill_Item))" >

    <SelectParameters>
        <asp:Parameter DefaultValue="Y" Name="Active_Flag" Type="String" />
        <asp:ControlParameter ControlID="TB_ItemCode" Name="Bill_Item" 
            PropertyName="Text" Type="String" />
    </SelectParameters>

后面的代碼

protected void GVEditRate_OnRowUpdating(object sender, GridViewUpdateEventArgs e)
{
    Business bz = new Business();
    rate_data rd = new rate_data();
    rd.itemcode = (GVEditRate.Rows[e.RowIndex].FindControl("Label1") as Label).Text;
    rd.ratecategory = (GVEditRate.Rows[e.RowIndex].FindControl("Label2") as Label).Text;
    string itmrt = (GVEditRate.Rows[e.RowIndex].FindControl("TextBox1") as TextBox).Text;
    rd.itemrate = Convert.ToDouble(itmrt);
    string prf = (GVEditRate.Rows[e.RowIndex].FindControl("TextBox2") as TextBox).Text;
    rd.profesionalchg = Convert.ToDouble(prf);
    string anes = (GVEditRate.Rows[e.RowIndex].FindControl("TextBox3") as TextBox).Text;
    rd.ansthcharge = Convert.ToDouble(anes);
    rd.effective_date = DateTime.Now;
    rd.LogId = Convert.ToDouble(Session["LogId"]);
    rd.ShiftId = Convert.ToInt16(Session["ShiftID"]);
    rd.Userid = Convert.ToString(Session["User"]);
    rd.Actv_flag = "Y";
    int upd_rate = bz.update_rate(rd);
    if (upd_rate > 0)
    {
        ClientScript.RegisterStartupScript(Page.GetType(), "validation",
                "<script language='javascript'>alert('Rate updation successful')</script>");
    }
    else
    {
        ClientScript.RegisterStartupScript(Page.GetType(), "validation",
       "<script language='javascript'>alert('could not update rate')</script>");

    }
}

Answer 1

錯誤消息告訴您，您需要為數據源定義一個UpdateCommand 。

您已經定義了SelectCommand，因此您的應用程序知道如何檢索數據。 但是它不知道如何更新或插入數據，因為您沒有指定它。

檢查您的SQLDataSource並插入適當的命令：

<asp:SqlDataSource
     id="SqlDataSource2"
     runat="server"
     SelectCommand="SELECT [Bill_Item], [Rate_Cat_Id], [Item_Rate], [Professional_Charge], [Anes_Charge], [Effective_Date] FROM [Rate_M] WHERE (([Active_Flag] = @Active_Flag) AND ([Bill_Item] = @Bill_Item))"
     UpdateCommand="INSERT Stored Procedure here">
     UpdateCommandType="StoredProcedure"
      /* ... */>
       <UpdateParameters>                
            <asp:Parameter Direction="Output" Name="Name1" Type="Int32" />
            <asp:Parameter Direction="Output" Name="Name2" Type="Int32" />
            <asp:Parameter Direction="Output" Name="Name3" Type="Int32" />
       </UpdateParameters>
</asp:SqlDataSource>