Question

我有一个asp.net Web表单应用程序将数据绑定（REFERENCE_NO）到DropDownList（ddlRef）.ddlRef根据BasicDatePickerControl（bdpApps）中的选定日期从MySql数据库中检索数据。我的代码如下：

    Protected Sub loadRefnumbers()
    Try
        cmd = New MySqlCommand("select idapp,REFERENCE_NO from ONLINELOANS where APPLICATION_DATE ='" & DateFormat.getSaveDate(bdpApps.SelectedDate) & "'", con)
        adp = New MySqlDataAdapter(cmd)
        Dim ds As New DataSet
        ds.Clear()
        adp.Fill(ds, "DATE_REFS")
        If ds.Tables(0).Rows.Count > 0 Then
            ddlRef.DataSource = cmd.ExecuteReader()
            ddlRef.DataTextField = "REFERENCE_NO"
            ddlRef.DataValueField = "idapp"
            ddlRef.DataBind()
        Else
            ddlRef.DataSource = Nothing
        End If

    Catch ex As Exception
        MsgBox(ex.Message)
    End Try

End Sub

我有一个getSaveDate函数，它将basicdatepicker控件中的日期格式转换为MySql Date格式（YYYY-MM-DD）。当我调试应用程序时，ddlRef控件未更新以反映REFERENCE_NO列中的值。我的SQL命令有什么问题吗？

Answer 1

上述问题的解决方案。对于那些在asp.net webforms中使用BasicDatePicker 1_4_3的人，我的问题的代码是在SelectionChanged处理程序上调用datepicker控件的查询：

    Protected Sub bdpApps_SelectionChanged(sender As Object, e As EventArgs) Handles bdpApps.SelectionChanged
    con = New SqlConnection(ConfigurationManager.ConnectionStrings("constr").ConnectionString)
    Using cmd As New SqlCommand("SELECT id,REFERENCE_NO from ONLINELOANS where APP_DATE='" & DateFormat.getSaveDate(bdpApps.SelectedDate) & "'")
        cmd.CommandType = CommandType.Text
        cmd.Connection = con
        con.Open()
        ddlRef.DataSource = cmd.ExecuteReader()
        ddlRef.DataTextField = "REFERENCE_NO"
        ddlRef.DataValueField = "idapp"
        ddlRef.DataBind()
        ddlRef.Items.Insert(0, New ListItem("--SELECT--", "0"))
        ddlRef.SelectedIndex = 0
        con.Close()
    End Using
End Sub

如何根据ASP中的BasicDatePicker选择填充DropDownList

1 个答案: