主题：求助按日加载

麻烦帮我再规范一下下面的代码。我的表名是cghd，日期列名是dhrq。不要产品加载，只要按年月日加载就好。谢谢

Dim cmd As New SQLCommand

Dim dt As DataTable

cmd.CommandText = "SELECT DISTINCT Year(日期) As 年, Month(日期) As 月, day(日期) As 日, 产品 From {订单}"

dt = cmd.ExecuteReader()

Dim trv As WinForm.TreeView = e.Form.Controls("TreeView1")

trv.BuildTree(dt, "年|月|日|产品")

nodemouseclick代码

Dim Value() As String

Dim Filter As String

Dim d1 As Date

Dim d2 As Date

Value = e.Node.FullPath.Split("\")

Select Case e.Node.Level

    Case 0

        Dim y As Integer = value(0)

        d1 = New Date(y,1,1) '取得该年的第一天

        d2 = new Date(y,12,31) '取得该年的最后一天

        Filter = "日期 >= #" & d1 & "# And 日期 <= #" & d2 & "#"

    Case 1

        Dim y As Integer = value(0)

        Dim m As Integer = value(1)

        d1 = New Date(y, m, 1) '取得该月的第一天

        d2 = new Date(y, m, Date.DaysInMonth(y,m)) '取得该月的最后一天

        Filter = "日期 >= #" & d1 & "# And 日期 <= #" & d2 & "#"

    Case 2

        Dim y As Integer = value(0)

        Dim m As Integer = value(1)

        Dim d As Integer = value(2)

        d1 = New Date(y, m, d) '取得该月的第一天

        Filter = "日期 = #" & d1 & "# "

    Case 3

        Dim y As Integer = value(0)

        Dim m As Integer = value(1)

        Dim d As Integer = value(2)

        d1 = New Date(y, m, d) '取得该月的第一天

        Filter = "日期 = #" & d1 & "# And 产品 = '" & Value(3) & "'"

End Select

Tables("订单").Filter = Filter