search.aspx.vb

这是用ASP.NET和SQLserver编写的购物网站的程序

Imports System.Data.SqlClient

Public Class search
    Inherits System.Web.UI.Page
    Dim connString As String = "data source=(local);initial catalog=ECDB;user id=sa;pwd=200343"
    Dim conn As SqlConnection = New SqlConnection(connString)
    Dim connSQL As String
    Protected WithEvents DrList As System.Web.UI.WebControls.DropDownList
    Protected WithEvents Button4 As System.Web.UI.WebControls.Button
    Protected WithEvents Label4 As System.Web.UI.WebControls.Label
    Protected WithEvents LinkButton1 As System.Web.UI.WebControls.LinkButton
    Protected WithEvents LinkButton2 As System.Web.UI.WebControls.LinkButton
    Protected WithEvents LinkButton3 As System.Web.UI.WebControls.LinkButton
    Protected WithEvents LinkButton4 As System.Web.UI.WebControls.LinkButton
    Protected WithEvents Label3 As System.Web.UI.WebControls.Label
    Protected WithEvents TB3 As System.Web.UI.WebControls.TextBox
    Protected WithEvents TB1 As System.Web.UI.WebControls.TextBox
    Protected WithEvents TB2 As System.Web.UI.WebControls.TextBox
    Protected WithEvents TB4 As System.Web.UI.WebControls.TextBox
    Protected WithEvents Button2 As System.Web.UI.WebControls.Button
    Protected WithEvents ImageButton1 As System.Web.UI.WebControls.ImageButton
    Protected WithEvents HyperLink6 As System.Web.UI.WebControls.HyperLink
    Protected WithEvents HyperLink5 As System.Web.UI.WebControls.HyperLink
    Protected WithEvents HyperLink4 As System.Web.UI.WebControls.HyperLink
    Protected WithEvents HyperLink3 As System.Web.UI.WebControls.HyperLink
    Protected WithEvents HyperLink1 As System.Web.UI.WebControls.HyperLink
    Protected WithEvents HyperLink2 As System.Web.UI.WebControls.HyperLink
    Protected WithEvents Label2 As System.Web.UI.WebControls.Label
    Protected WithEvents Button1 As System.Web.UI.WebControls.Button
    Dim queSQL As String
    Dim Pagesize, Pagecount, RecordNum, CurrentPage As Integer
    Protected WithEvents lbnNextPage As System.Web.UI.WebControls.LinkButton
    Protected WithEvents lblRecordCount As System.Web.UI.WebControls.Label
    Protected WithEvents TextBox1 As System.Web.UI.WebControls.TextBox
    Protected WithEvents Label5 As System.Web.UI.WebControls.Label
    Protected WithEvents LinkButton5 As System.Web.UI.WebControls.LinkButton
    Protected WithEvents Hyperlink11 As System.Web.UI.WebControls.HyperLink
    Protected WithEvents Label1 As System.Web.UI.WebControls.Label
    Protected WithEvents Button3 As System.Web.UI.WebControls.Button
    Protected WithEvents lbnPrevPage As System.Web.UI.WebControls.LinkButton
#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。
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()

    End Sub
    Protected WithEvents DataList1 As System.Web.UI.WebControls.DataList

    '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

    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 Session("userpower") = 1 Then
            Label2.Text = "欢迎" & Session("username")
            Label2.Visible = True
            Button1.Visible = True
        Else
            Label2.Visible = False
            Button1.Visible = False
        End If

        If Not IsPostBack Then
            TB3.Text = "产品编号"
            TB1.Text = "产品名称"
            TB2.Text = "最低价格"
            TB4.Text = "最高价格"
            conn.Open()
            connSQL = "select name,productid from product"
            Dim DS As New DataSet
            Dim adapter As New SqlDataAdapter(connSQL, conn)
            adapter.Fill(DS)
            DrList.DataSource = DS.Tables(0)
            DrList.DataTextField() = DS.Tables(0).Columns("name").ToString
            DrList.DataValueField() = DS.Tables(0).Columns("productid").ToString
            DrList.DataBind()
            DS.Dispose()
            adapter.Dispose()
            conn.Close()
        End If

        '每页显示的个数
        Pagesize = 4
        conn.Open()
        queSQL = "SELECT count(*)  ID from item where productid = " + " 'p1' "
        Dim cmd As New SqlCommand
        cmd.CommandText = queSQL
        cmd.Connection = conn

        '计算总共有多少记录   
        Dim dr As SqlClient.SqlDataReader = cmd.ExecuteReader()
        Dim intCount As Integer
        If dr.Read() Then
            intCount = dr("ID")
        Else
            intCount = 0
        End If
        dr.Close()
        RecordNum = intCount

        '计算总共有多少页    
        If RecordNum Mod Pagesize = 0 Then
            Pagecount = RecordNum \ Pagesize
        Else
            Pagecount = RecordNum \ Pagesize + 1
        End If
        ViewState("PageCount") = Pagecount
        lblRecordCount.Text = Pagecount
        If Not IsPostBack Then
            CurrentPage = 0
            ViewState("PageIndex") = 0
            listbind()
        End If
        Label5.Text = CurrentPage + 1
        conn.Close()
    End Sub

    Private Sub ImageButton1_Click(ByVal sender As System.Object, ByVal e As System.Web.UI.ImageClickEventArgs)
        Response.Redirect("webform1.aspx")
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Label2.Visible = False
        Button1.Visible = False
        Session("userpower") = -1
        Session("username") = ""
    End Sub

    Private Sub LinkButton1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles LinkButton1.Click
        Session("mainPRO") = LinkButton1.Text
        Response.Redirect("WebForm3.aspx")
    End Sub

    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
        Dim proID As String = DrList.SelectedValue
        Session("proID") = proID
        Response.Redirect("webform2.aspx")
    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        Response.Redirect("search.aspx")
    End Sub

    Private Sub LinkButton2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles LinkButton2.Click
        Session("mainPRO") = LinkButton2.Text
        Response.Redirect("webform3.aspx")
    End Sub

    Private Sub LinkButton3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles LinkButton3.Click
        Session("mainPRO") = LinkButton3.Text
        Response.Redirect("webform3.aspx")
    End Sub

    Private Sub LinkButton4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles LinkButton4.Click
        Session("mainPRO") = LinkButton4.Text
        Response.Redirect("WebForm3.aspx")
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Session("itemID") = TB3.Text
        Session("itemName") = TB1.Text
        Session("lowPrice") = TB2.Text
        Session("highPrice") = TB4.Text
        


        Response.Redirect("WebForm4.aspx")
    End Sub

    Private Sub DataList1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DataList1.SelectedIndexChanged

    End Sub

    Sub listbind()
        Dim StartIndex As Integer

        StartIndex = CurrentPage * Pagesize
        Dim strSel As String = "select  *  from  item where productid = " + " 'p1' "
        Dim ds As DataSet = New DataSet
        Dim MyAdapter As SqlClient.SqlDataAdapter = New SqlClient.SqlDataAdapter(strSel, conn)
        MyAdapter.Fill(ds, StartIndex, Pagesize, "Result")

        DataList1.DataSource = ds.Tables("result").DefaultView
        DataList1.RepeatDirection = RepeatDirection.Horizontal
        DataList1.DataBind()

        lbnNextPage.Enabled = True
        lbnPrevPage.Enabled = True
        If (CurrentPage = (Pagecount - 1)) Then lbnNextPage.Enabled = False
        If (CurrentPage = 0) Then lbnPrevPage.Enabled = False

    End Sub





    Sub Page_OnClick(ByVal sender As Object, ByVal e As CommandEventArgs)

        CurrentPage = ViewState("PageIndex")
        Pagecount = ViewState("PageCount")

        Dim cmd As String = e.CommandName
        Select Case cmd
            Case "next"
                If CurrentPage < (Pagecount - 1) Then CurrentPage += 1
            Case "prev"
                If CurrentPage > 0 Then CurrentPage -= 1
        End Select
        ViewState("PageIndex") = CurrentPage
        Label5.Text = CurrentPage + 1
        listbind()

    End Sub

    Private Sub LinkButton5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles LinkButton5.Click
        CurrentPage = TextBox1.Text - 1
        ViewState("PageIndex") = CurrentPage
        Label5.Text = CurrentPage + 1
        listbind()
    End Sub


End Class