Question

select Preacher_Id , Name from Preacher_SkillDetail
where Preacher_Id not in (
      where Preacher_FK from Event_Preacher
      where (@newstartdate <= Start_Date and @newenddate >= Start_Date) 
      or (@newstartdate <= End_Date and @newenddate >= End_Date)
      or (@newstartdate >= End_Date and @newenddate  <= End_Date)
      or (@newstartdate <= Start_Date and @newenddate >= End_Date)
)

我希望bind the output改为ropdowncontrol

我怎样才能在c＃.net中做到这一点？我有变量newstartdate and newenddate as Date

Answer 1

DataTable GetData() {

    SqlConnection connection=new SqlConnection();
    connection.ConnectionString="Put your connection string";


    SqlCommand command = connection.CreateCommand();

    command.CommandText = "Your Sql Query Geos here";

    DataTable dt = new DataTable();

    try
    {
        command.Connection.Open();
        dt.Load(command.ExecuteReader());



    }
    catch (Exception ex)
    {

        // Log ur error;


    }
    finally {

        connection.Close();
    }
    return dt;
    }

然后

Dropdownlist.Datasource=GetData();
Dropdownlist.DataBind();

在控件属性中指定文本字段和值字段。

我认为这应该有用。

Answer 2

您必须绑定下拉列表的DataTextField和DataValueField。 DataTextField是显示下拉列表中元素的字段。 DataValueField保存这些字段的ID。如果您的查询返回类似的内容 Peacher_id |名称 1 | Peacher 1 2 | Peacher 2 3 | Peacher 3 理想情况下，Peacher_Id应绑定到DataValueField，Name应绑定到DataTextField。您可以转到下拉列表属性并设置这些属性。之后，您只需将数据源绑定到下拉列表。

dropdownlist.DataSource = ds; dropdownlist.DataBind（）;

我该如何解决以下SQL查询？

2 个答案: