我用 session 和GridView控件做了一个简单的购物车,可以装商品了,但是为什么只能买一件东西呢,问题出在哪里啊,请教各位大侠....
需要贴代码吗...
需要贴代码吗...
解决方案 »
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代码;
Sub AddToTable(ByVal bookid As String)
Dim adp As OleDbDataAdapter
Dim ds As DataSet
Dim Sql As String
Sql = "select * from book where bookid=" & bookid
Dim db As New ConnDB
Dim conn As OleDbConnection = db.Getcn
adp = New OleDbDataAdapter(Sql, conn)
Dim dt As DataTable
ds = New DataSet()
adp.Fill(ds, "book")
dt = ds.Tables("book")
Dim dr As DataRow = mytb.NewRow()
dr(0) = dt.Rows(0)("bookid")
dr(1) = dt.Rows(0)("bookname")
dr(2) = dt.Rows(0)("price")
dr(3) = 1
dr(4) = dr(2) * dr(3)
mytb.Rows.Add(dr)
End Sub
Sub newTable()
mytb = New DataTable()
mytb.Columns.Add(New DataColumn("bookid", GetType(String)))
mytb.Columns.Add(New DataColumn("bookname", GetType(String)))
mytb.Columns.Add(New DataColumn("bookprice", GetType(System.Int32)))
mytb.Columns.Add(New DataColumn("bookcount", GetType(System.Int32)))
mytb.Columns.Add(New DataColumn("booktotal", GetType(System.Int32)))
End Sub
Sub Total()
Dim i As Integer
Dim booktotal As Integer = 0
Dim bookcount As Integer = 0
For i = 0 To mytb.Rows.Count - 1
booktotal = booktotal + mytb.Rows(i)(4)
bookcount = bookcount + mytb.Rows(i)(3)
Next
lbltatol.Text = " 总金额:" & booktotal
lblcount.Text = "商品总数量:" & bookcount
End Sub
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim bookid As String = Request.QueryString("id")
If Session("boodcart") Is Nothing Then
newTable()
Session("bookcart") = mytb
Else
mytb = Session("bookcart")
End If If Not Page.IsPostBack Then
If (Not bookid = "") Then
Call AddToTable(bookid)
End If
Call Total()
GridView1.DataSource = New DataView(mytb)
GridView1.DataBind()
End If
End Sub
大概就这些了``运行调试总是只能买一件商品....为什么啊....要是不得,明天再解决..学校准备要关灯了
newTable()
Session("bookcart") = mytb
Else
mytb = Session("bookcart")
End If 低级错误,赫赫,结贴把