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BOOK: Beginning ASP.NET 2.0 BOOK VB ISBN: 978-0-7645-8850-1; C# ISBN: 978-0-470-04258-8
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Old October 28th, 2007, 12:30 PM
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Default Modifying Shopping Cart Class

Below is the current database structure.


The OptionGroup holds the product attribute, e.g. Colour related to the product
Every product has it's own OptionGroup, as every product is unique.

The GroupOptions holds the attributes, e.g. Red, Blue, Green


Products
--------
ProductID (PK)
ProductCode
Name
Description
Price
PictureURL
ThumbURL
CatID
Featured
Active


OptionGroup
-----------------
OptionGroupID (PK)
OptionGroupName
ProductID (FK)


GroupOptions
------------
GroupOptionID (PK)
OptionGroupValues
OptionGroupID (FK)



How can I edit the sample class code below to reflect my database structure above?

Imports Microsoft.VisualBasic
Imports System.Data
Imports System.Data.SqlClient
Imports System.Collections.Generic

Namespace Wrox.Commerce

    <Serializable()> _
    Public Class CartItem
        Private _productID As Integer
        Private _productName As String
        Private _productImageUrl As String
        Private _quantity As Integer
        Private _price As Double
        Private _lineTotal As Double

        Public Sub New()
        End Sub

        Public Sub New(ByVal ProductID As Integer, ByVal ProductName As String, ByVal ProductImageUrl As String, ByVal Quantity As Integer, ByVal Price As Double)

            _productID = ProductID
            _productName = ProductName
            _productImageUrl = ProductImageUrl
            _quantity = Quantity
            _price = Price
            _lineTotal = Quantity * Price

        End Sub

        Public Property ProductID() As Integer
            Get
                Return _productID
            End Get
            Set(ByVal value As Integer)
                _productID = value
            End Set
        End Property

        Public Property ProductName() As String
            Get
                Return _productName
            End Get
            Set(ByVal value As String)
                _productName = value
            End Set
        End Property

        Public Property ProductImageUrl() As String
            Get
                Return _productImageUrl
            End Get
            Set(ByVal value As String)
                _productImageUrl = value
            End Set
        End Property

        Public Property Quantity() As Integer
            Get
                Return _quantity
            End Get
            Set(ByVal value As Integer)
                _quantity = value
            End Set
        End Property

        Public Property Price() As Double
            Get
                Return _price
            End Get
            Set(ByVal value As Double)
                _price = value
            End Set
        End Property

        Public ReadOnly Property LineTotal() As Double
            Get
                Return _quantity * _price
            End Get
        End Property

    End Class


    <Serializable()> _
    Public Class WroxShoppingCart

        Private _dateCreated As DateTime
        Private _lastUpdate As DateTime
        Private _items As List(Of CartItem)

        Public Sub New()
            _items = New List(Of CartItem)
            _dateCreated = DateTime.Now
        End Sub


        Public Property Items() As List(Of CartItem)
            Get
                Return _items
            End Get
            Set(ByVal value As List(Of CartItem))
                _items = value
            End Set
        End Property

        Public Sub Insert(ByVal ProductID As Integer, ByVal Price As Double, ByVal Quantity As Integer, ByVal ProductName As String, ByVal ProductImageUrl As String)

            Dim ItemIndex As Integer = ItemIndexOfID(ProductID)

            If ItemIndex = -1 Then
                Dim NewItem As New CartItem()

                NewItem.ProductID = ProductID
                NewItem.Quantity = Quantity
                NewItem.Price = Price
                NewItem.ProductName = ProductName
                NewItem.ProductImageUrl = ProductImageUrl

                _items.Add(NewItem)
            Else
                _items(ItemIndex).Quantity += 1
            End If

            _lastUpdate = DateTime.Now()

        End Sub

        Public Sub Update(ByVal RowID As Integer, ByVal ProductID As Integer, ByVal Quantity As Integer, ByVal Price As Double)

            Dim Item As CartItem = _items(RowID)

            Item.ProductID = ProductID
            Item.Quantity = Quantity
            Item.Price = Price
            _lastUpdate = DateTime.Now()

        End Sub

        Private Function ItemIndexOfID(ByVal ProductID As Integer) As Integer

            Dim index As Integer

            For Each item As CartItem In _items
                If item.ProductID = ProductID Then
                    Return index
                End If
                index += 1
            Next

            Return -1

        End Function

        Public Sub DeleteItem(ByVal rowID As Integer)

            _items.RemoveAt(rowID)
            _lastUpdate = DateTime.Now()

        End Sub

        Public ReadOnly Property Total() As Double
            Get
                Dim t As Double

                If _items Is Nothing Then
                    Return 0
                End If

                For Each Item As CartItem In _items
                    t += Item.LineTotal
                Next

                Return t
            End Get
        End Property

    End Class

End Namespace


Thanks.






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