ASP,VB.NET写的,用的SQLSERVER数据库,影片超市系统,属于网上购物系统

				Public Class 商品信息查询
				    Inherits System.Web.UI.Page
				
				#Region " Web 窗体设计器生成的代码 "
				
				    '该调用是 Web 窗体设计器所必需的。
				     Private Sub InitializeComponent()
				
				    End Sub
				    Protected WithEvents DataGrid1 As System.Web.UI.WebControls.DataGrid
				    Protected WithEvents Ddlfl As System.Web.UI.WebControls.DropDownList
				    Protected WithEvents Ddlpm As System.Web.UI.WebControls.DropDownList
				    Protected WithEvents Ddlxh As System.Web.UI.WebControls.DropDownList
				    Protected WithEvents Ddlpp As System.Web.UI.WebControls.DropDownList
				
				    '注意: 以下占位符声明是 Web 窗体设计器所必需的。
				    '不要删除或移动它。
				    Private designerPlaceholderDeclaration As System.Object
				
				    Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
				        'CODEGEN: 此方法调用是 Web 窗体设计器所必需的
				        '不要使用代码编辑器修改它。
				        InitializeComponent()
				    End Sub
				
				#End Region
				    Dim myd As New dataOP()
				    Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
				        '在此处放置初始化页的用户代码
				        If Not IsPostBack Then
				            Dim ss() As String
				            ss = myd.rearr("select 分类名 from 分类")
				            Ddlfl.DataSource = ss
				            Ddlfl.DataBind()
				            Ddlfl.Items.Add("")
				
				            Ddlfl.SelectedIndex = Ddlfl.Items.Count - 1
				            datab("select * from 商品")
				
				        End If
				    End Sub
				
				    Private Sub Ddlfl_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Ddlfl.SelectedIndexChanged
				        Dim ss() As String
				        ss = myd.rearr("select distinct 品名 from 商品 where 分类='" & Ddlfl.SelectedItem.Text & "'")
				        Ddlpm.DataSource = ss
				        Ddlpm.DataBind()
				
				        Ddlpm.Items.Add("")
				        Ddlpm.SelectedIndex = Ddlpm.Items.Count - 1
				
				        datab("select * from 商品 where 分类='" & Ddlfl.SelectedItem.Text & "'")
				    End Sub
				
				    Sub datab(ByVal str As String)
				        DataGrid1.DataSource = myd.retab(str)
				        DataGrid1.DataBind()
				    End Sub
				
				    Private Sub Ddlpm_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Ddlpm.SelectedIndexChanged
				        Dim ss() As String
				        ss = myd.rearr("select distinct 品牌 from 商品 where 分类='" & _
				           Ddlfl.SelectedItem.Text & "' and 品名='" & Ddlpm.SelectedItem.Text & "'")
				        Ddlpp.DataSource = ss
				        Ddlpp.DataBind()
				
				        Ddlpp.Items.Add("")
				        Ddlpp.SelectedIndex = Ddlpp.Items.Count - 1
				
				        datab("select * from 商品 where 分