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Shopping Cart

Shopping Cart ASP.NET State Management Session: User state Application: Application state Cache Static variables: Public Shared interestRate as Single Demo:StateTest2.aspx dim msg1, msg2, msg3 as string public shared msg4 as string sub Page_Load() if not page.ispostBack then

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Shopping Cart

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  1. Shopping Cart

  2. ASP.NET State Management • Session: User state • Application: Application state • Cache • Static variables: • Public Shared interestRate as Single • Demo:StateTest2.aspx

  3. dim msg1, msg2, msg3 as string public shared msg4 as string sub Page_Load() if not page.ispostBack then msg1="hi one" msg2="hi two" msg3="hi three" msg4="hi four" response.write("First time loading page. the message one is:" + msg1 + "<br>") response.write("First time loading page. the message two is:" + msg2 + "<br>") response.write("First time loading page. the message three is:" + msg3 + "<br>") response.write("First time loading page. the message four is:" + msg4 + "<br>") session("myMsg1")=msg1 application("myMsg2")=msg2 cache("myMsg3")=msg3 else msg1=session("myMsg1") msg2=application("myMsg2") msg3=cache("myMsg3") response.write("After the fist page loading, the message one is:" + msg1 + "<br>") response.write("After the fist page loading, the message two is:" + msg2 + "<br>") response.write("After the fist page loading, the message three is:" + msg3 + "<br>") response.write("After the fist page loading, the message four is:" + msg4 + "<br>") end if end sub

  4. Shopping Cart • Search and display product information • Add item to cart • View cart contents • Check out

  5. Shopping Cart Example • Database: • WebCustomer: CustID, CustName, Addr, Phone • WebOrder: OrderID, CustID, OrderDate, CreditCardType, CreditCardNo • WebLine: OrderID, PID, Qty • WebProduct: Pid, Pname, Price, UnitsInStock • Session ID is used for OrderID • Other choices? Visitor Counter? • Login user using cookie • Each item is modeled as a class, and items are collected in a collection before added to the database.

  6. Implementing Shopping Cart as Class • Shopping Cart Properties: • Public oid As String • Public cid As String • Public ODate As DateTime • Public CreditCardType As String • Public CreditCardNo as String • Public CollCartLine As New ArrayList() • Methods: AddItem, DeleteItem, ViewCart, CheckOut • DetailLine Properties: • OID • PID • Pname • Price • Qty • Amount = Qty * Price

  7. Adding Buttons to a Bound DataGrid • Use DataGrid/Columns editor • Bound columns, Button columns, Template columns • Button event procedures • CodeWIndow/DataGrid • DeleteCommand • EditCommand • CancelCommand • UpdateCommand • e As System.Web.UI.WebControls.DataGridCommandEventArgs

  8. Edit/Delete Customer Record Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load If Not Page.IsPostBack Then OleDbDataAdapter1.Fill(DataSet31, "customer") DataGrid1.DataBind() Session("MyDs") = DataSet31 Else DataSet31 = Session("MyDs") End If End Sub Private Sub DataGrid1_EditCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) Handles DataGrid1.EditCommand DataGrid1.EditItemIndex = e.Item.ItemIndex DataGrid1.DataBind() End Sub

  9. Private Sub DataGrid1_UpdateCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) Handles DataGrid1.UpdateCommand DataSet31.Tables("Customer").Rows(e.Item.ItemIndex).Item("rating") = CType(e.Item.Cells(4).Controls(0), TextBox).Text DataGrid1.EditItemIndex = -1 DataGrid1.DataBind() Session("MyDs") = DataSet31 End Sub Private Sub DataGrid1_CancelCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) Handles DataGrid1.CancelCommand DataGrid1.EditItemIndex = -1 DataGrid1.DataBind() End Sub

  10. Private Sub DataGrid1_DeleteCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) Handles DataGrid1.DeleteCommand DataSet31.Tables("customer").Rows.RemoveAt(e.Item.ItemIndex) DataGrid1.DataBind() Session("MyDs") = DataSet31 End Sub

  11. DataGrid Button Commands Examples • DeleteCommand: DataSet31.Tables("customer").Rows.RemoveAt(e.Item.ItemIndex) • Edit Command: • DataGrid1.EditItemIndex = e.Item.ItemIndex • Cancel command: • DataGrid1.EditItemIndex = -1 • Update command: DataSet31.Tables("Customer").Rows(e.Item.ItemIndex).Item("rating") = CType(e.Item.Cells(4).Controls(0), TextBox).Text • DataGrid1.EditItemIndex = -1 • Note: CType(e.Item.Cells(4).Controls(0), TextBox)

  12. Dim objDataSet As New DataSet Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load 'Put user code to initialize the page here If Not Page.IsPostBack Then Dim strConn As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source = c:\sales2k.mdb" Dim objConn As New OleDbConnection(strConn) Dim strSQL As String = "select pid,description,price from product;" Dim objAdapter As New OleDbDataAdapter(strSQL, objConn) objAdapter.Fill(objDataSet, "Product") DataGrid1.DataSource = objDataSet DataGrid1.DataMember = "Product" DataGrid1.DataBind() Session("MyDs") = objDataSet Else objDataSet = Session("MyDs") End If End Sub Private Sub DataGrid1_EditCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) Handles DataGrid1.EditCommand DataGrid1.EditItemIndex = e.Item.ItemIndex DataGrid1.DataSource = objDataSet DataGrid1.DataMember = "Product" DataGrid1.DataBind() End Sub DataGrid Button Commands Example

  13. Private Sub DataGrid1_UpdateCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) Handles DataGrid1.UpdateCommand objDataSet.Tables("Product").Rows(e.Item.ItemIndex).Item("Price") = CDbl(CType(e.Item.Cells(4).Controls(0), TextBox).Text) DataGrid1.EditItemIndex = -1 DataGrid1.DataSource = objDataSet DataGrid1.DataMember = "Product" DataGrid1.DataBind() Session("MyDs") = objDataSet End Sub Private Sub DataGrid1_CancelCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) Handles DataGrid1.CancelCommand DataGrid1.EditItemIndex = -1 DataGrid1.DataSource = objDataSet DataGrid1.DataMember = "Product" DataGrid1.DataBind() End Sub Private Sub DataGrid1_DeleteCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) Handles DataGrid1.DeleteCommand objDataSet.Tables("Product").Rows.RemoveAt(e.Item.ItemIndex) DataGrid1.DataSource = objDataSet DataGrid1.DataMember = "Product" DataGrid1.DataBind() Session("MyDs") = objDataSet End Sub

  14. Adding Textbox and Button and to a Bound DataGrid • DataGrid Properties/Columns editor: • Template column: • HeaderText: This text will be used as column name • Web Page’s HTML view: • Add ItemTemplate to the Template column tag • Add Control’s tag • Event: ItemCommand

  15. Example <asp:TemplateColumn HeaderText="Quantity"> <ItemTemplate> <asp:TextBox id="txtQty" Width="70“ runat="server"></asp:TextBox> </ItemTemplate> </asp:TemplateColumn> <asp:TemplateColumn HeaderText="AddToCart"> <ItemTemplate> <asp:Button Text="AddToCart" Runat="server"></asp:Button> </ItemTemplate> </asp:TemplateColumn>

  16. How to retrieve data from a cell in the selected row? Private Sub DataGrid1_ItemCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) Handles DataGrid1.ItemCommand • Response.Write(CType(e.Item.Cells(4).Controls(1), TextBox).Text) • Response.Write(CType(e.Item.Cells(4).FindControl("txtQty"), TextBox).Text) End Sub Note: Cells(4).Controls(1) Controls(0) is the cell itself, Controls(1) is the 2nd control in the cell.

  17. If there are two buttons created by ItemTemplate, how to tell which button is clicked? • Use the ItemCommand procedure • Private Sub DataGrid1_ItemCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) Handles DataGrid1.ItemCommand • If e.CommandSource.text = "View" Then • Response.Write("You click View button") • End If • If e.CommandSource.text = "Add" Then • Response.Write("You click Add button") • End If • End Sub

  18. ShopCart Class Public Class ShopCart Public oid As String Public cid As String Public ODate As DateTime Public CreditCardType As String Public CreditCardNo As String Public CollCartLine As New ArrayList() Public ReadOnly Property CartTotal() As Double Get Dim item As New CartLine Dim total As Double Dim itemIndex As Integer For Each item In CollCartLine total = total + item.price * item.qty Next CartTotal = total End Get End Property

  19. AddItem Method Public Sub AddItem(ByVal line As CartLine) Dim item As New CartLine() Dim incart As New Boolean() incart = False If CollCartLine.Count > 0 Then For Each item In CollCartLine If item.pid = line.pid Then item.qty = line.qty incart = True Exit For End If Next End If If incart = False Then CollCartLine.Add(line) End If End Sub

  20. Public Sub deleteItem(ByVal deleteIndex As Integer) CollCartLine.RemoveAt(deleteIndex) End Sub Public Sub checkOut() Dim objLine As New CartLine() Dim strSQL As String Dim strConn As String strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source = c:\sales2k.mdb" Dim objConn As New OleDbConnection() objConn.ConnectionString = strConn Dim objComm As New OleDbCommand() objConn.Open() objComm.Connection = objConn objComm.CommandType = CommandType.Text strSQL = "insert into weborder values ('" & oid & "', '" & cid & "', #" & ODate.ToString & "#, '" & CreditCardType & "','" & CreditCardNo & "')" objComm.CommandText = strSQL objComm.ExecuteNonQuery() For Each objLine In CollCartLine strSQL = "insert into webline values ('" & objLine.oid & "', '" & objLine.pid & "', " & CStr(objLine.qty) & ")" objComm.CommandText = strSQL objComm.ExecuteNonQuery() Next End Sub End Class

  21. Shopping Cart Detail Line Public Class CartLine Private hiddenoid As String Private hiddenpid As String Private hiddenpname As String Private hiddenprice As Double Private hiddenqty As Integer Public Property oid() As String Get oid = hiddenoid End Get Set(ByVal Value As String) hiddenoid = Value End Set End Property Public Property pid() As String Get pid = hiddenpid End Get Set(ByVal Value As String) hiddenpid = Value End Set End Property

  22. Public Property pname() As String Get pname = hiddenpname End Get Set(ByVal Value As String) hiddenpname = Value End Set End Property Public Property price() As Double Get price = hiddenprice End Get Set(ByVal Value As Double) hiddenprice = Value End Set End Property Public Property qty() As Integer Get qty = hiddenqty End Get Set(ByVal Value As Integer) hiddenqty = Value End Set End Property Public ReadOnly Property amount() As Double Get amount = qty * price End Get End Property End Class

  23. AddToCart Button Event Procedure Private Sub DataGrid1_ItemCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) Handles DataGrid1.ItemCommand MyCart = Session("MyShopCart") Dim objLine As New CartLine() objLine.oid = Session.SessionID objLine.pid = e.Item.Cells(0).Text objLine.pname = e.Item.Cells(1).Text objLine.price = CDbl(e.Item.Cells(2).Text) objLine.qty = CInt(CType(e.Item.Cells(1).FindControl("tbox"), TextBox).Text) MyCart.AddItem(objLine) Response.Write("number of items in cart:" & CStr(MyCart.CollCartLine.Count)) End Sub

  24. Delete Button Procedure Private Sub DataGrid1_DeleteCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) Handles DataGrid1.DeleteCommand myCart.deleteItem(e.Item.ItemIndex) Session("MyShopCart") = myCart DataGrid1.DataSource = myCart.CollCartLine DataGrid1.DataBind() txtAmount.Text = myCart.CartTotal.ToString End Sub

  25. CheckOut Procedure Dim MyCart As New ShopCart() Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load 'Put user code to initialize the page here MyCart = Session("MyShopCart") End Sub Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click MyCart.oid = Session.SessionID MyCart.cid = Session("cid") MyCart.ODate = DateTime.Now() MyCart.CreditCardType = RadioButtonList1.SelectedItem.Text MyCart.CreditCardNo = TextBox1.Text MyCart.checkOut() Response.Write("<p align='center'><font size='5'><b>Thank you for shopping at My.Com</b></font></p>") Session.Abandon() End Sub

  26. Web Service • XML Web Service • Web services are classes that are stored on the web which can instantiate and use in both Windows and Web applications.

  27. A Web Service ExampleASPET/TestWebService.ASMX <%@ WebService Class="CustomerInfo" %> imports System.Web.Services imports System imports System.Data imports System.Data.Oledb Public Class CustomerInfo <webMethod()> public Function GetCname(ByVal CID as String) as String dim strConn as string ="Provider=Microsoft.Jet.OLEDB.4.0;Data Source = c:\sales2k.mdb" dim objConn as new OledbConnection(strConn) dim strSQL as string = "select * from customer where CID = '" & CID & "';" dim objComm as new OledbCommand(strSQL,objConn) dim Results as string objConn.open() dim objDataReader as oledbDataReader objDataReader=objComm.executeReader() objDataReader.read() return objDataReader("Cname") end function

  28. Creating a Web Service Using VS • New Project/ASP.Net Web Service

  29. Web Service Description Language (WSDL) • A WSDL file is an XML document containing a complete description of the web service. It shows a web service’s name, methods, and parameter types. • Help page: After entering web service’s URL, a help page is displayed. You can click the Service Description link to see the WSDL file.

  30. Consuming Web Services from a Windows Application • Add a web reference to the web service. • Declare a web service class variable. • Dim myWebService As New dchaolaptop.CustomerInfo() • Demo: VBNetExample/UseWebService

  31. Universal Description, Discovery, and Integration (UDDI) • A directory service for web services. • http://uddi.org

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