categoriesproducts.vb

Mastering VBNet Include Source Code

                Return Me.columnCategoryID
            End Get
        End Property
        
        Friend ReadOnly Property QuantityPerUnitColumn As DataColumn
            Get
                Return Me.columnQuantityPerUnit
            End Get
        End Property
        
        Friend ReadOnly Property UnitPriceColumn As DataColumn
            Get
                Return Me.columnUnitPrice
            End Get
        End Property
        
        Friend ReadOnly Property UnitsInStockColumn As DataColumn
            Get
                Return Me.columnUnitsInStock
            End Get
        End Property
        
        Friend ReadOnly Property UnitsOnOrderColumn As DataColumn
            Get
                Return Me.columnUnitsOnOrder
            End Get
        End Property
        
        Friend ReadOnly Property ReorderLevelColumn As DataColumn
            Get
                Return Me.columnReorderLevel
            End Get
        End Property
        
        Friend ReadOnly Property DiscontinuedColumn As DataColumn
            Get
                Return Me.columnDiscontinued
            End Get
        End Property
        
        Public Default ReadOnly Property Item(ByVal index As Integer) As ProductsRow
            Get
                Return CType(Me.Rows(index),ProductsRow)
            End Get
        End Property
        
        Public Event ProductsRowChanged As ProductsRowChangeEventHandler
        
        Public Event ProductsRowChanging As ProductsRowChangeEventHandler
        
        Public Event ProductsRowDeleted As ProductsRowChangeEventHandler
        
        Public Event ProductsRowDeleting As ProductsRowChangeEventHandler
        
        Public Overloads Sub AddProductsRow(ByVal row As ProductsRow)
            Me.Rows.Add(row)
        End Sub
        
        Public Overloads Function AddProductsRow(ByVal ProductName As String, ByVal SupplierID As Integer, ByVal parentCategoriesRowByCategoriesProducts As CategoriesRow, ByVal QuantityPerUnit As String, ByVal UnitPrice As Decimal, ByVal UnitsInStock As Short, ByVal UnitsOnOrder As Short, ByVal ReorderLevel As Short, ByVal Discontinued As Boolean) As ProductsRow
            Dim rowProductsRow As ProductsRow = CType(Me.NewRow,ProductsRow)
            rowProductsRow.ItemArray = New Object() {Nothing, ProductName, SupplierID, parentCategoriesRowByCategoriesProducts(0), QuantityPerUnit, UnitPrice, UnitsInStock, UnitsOnOrder, ReorderLevel, Discontinued}
            Me.Rows.Add(rowProductsRow)
            Return rowProductsRow
        End Function
        
        Public Function FindByProductID(ByVal ProductID As Integer) As ProductsRow
            Return CType(Me.Rows.Find(New Object() {ProductID}),ProductsRow)
        End Function
        
        Public Function GetEnumerator() As System.Collections.IEnumerator Implements System.Collections.IEnumerable.GetEnumerator
            Return Me.Rows.GetEnumerator
        End Function
        
        Private Sub InitClass()
            Me.columnProductID = New DataColumn("ProductID", GetType(System.Int32), "", System.Data.MappingType.Element)
            Me.columnProductID.AutoIncrement = true
            Me.columnProductID.AllowDBNull = false
            Me.columnProductID.ReadOnly = true
            Me.columnProductID.Unique = true
            Me.Columns.Add(Me.columnProductID)
            Me.columnProductName = New DataColumn("ProductName", GetType(System.String), "", System.Data.MappingType.Element)
            Me.columnProductName.AllowDBNull = false
            Me.Columns.Add(Me.columnProductName)
            Me.columnSupplierID = New DataColumn("SupplierID", GetType(System.Int32), "", System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnSupplierID)
            Me.columnCategoryID = New DataColumn("CategoryID", GetType(System.Int32), "", System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnCategoryID)
            Me.columnQuantityPerUnit = New DataColumn("QuantityPerUnit", GetType(System.String), "", System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnQuantityPerUnit)
            Me.columnUnitPrice = New DataColumn("UnitPrice", GetType(System.Decimal), "", System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnUnitPrice)
            Me.columnUnitsInStock = New DataColumn("UnitsInStock", GetType(System.Int16), "", System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnUnitsInStock)
            Me.columnUnitsOnOrder = New DataColumn("UnitsOnOrder", GetType(System.Int16), "", System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnUnitsOnOrder)
            Me.columnReorderLevel = New DataColumn("ReorderLevel", GetType(System.Int16), "", System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnReorderLevel)
            Me.columnDiscontinued = New DataColumn("Discontinued", GetType(System.Boolean), "", System.Data.MappingType.Element)
            Me.columnDiscontinued.AllowDBNull = false
            Me.Columns.Add(Me.columnDiscontinued)
            Me.PrimaryKey = New DataColumn() {Me.columnProductID}
        End Sub
        
        Public Function NewProductsRow() As ProductsRow
            Return CType(Me.NewRow,ProductsRow)
        End Function
        
        Protected Overrides Function NewRowFromBuilder(ByVal builder As DataRowBuilder) As DataRow
            'We need to ensure that all Rows in the tabled are typed rows.
            'Table calls newRow whenever it needs to create a row.
            'So the following conditions are covered by Row newRow(Record record)
            '* Cursor calls table.addRecord(record) 
            '* table.addRow(object[] values) calls newRow(record)    
            Return New ProductsRow(builder)
        End Function
        
        Protected Overrides Function GetRowType() As System.Type
            Return GetType(ProductsRow)
        End Function
        
        Protected Overrides Sub OnRowChanged(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanged(e)
            If (Not (Me.ProductsRowChangedEvent) Is Nothing) Then
                RaiseEvent ProductsRowChanged(Me, New ProductsRowChangeEvent(CType(e.Row,ProductsRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowChanging(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowChanging(e)
            If (Not (Me.ProductsRowChangingEvent) Is Nothing) Then
                RaiseEvent ProductsRowChanging(Me, New ProductsRowChangeEvent(CType(e.Row,ProductsRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleted(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleted(e)
            If (Not (Me.ProductsRowDeletedEvent) Is Nothing) Then
                RaiseEvent ProductsRowDeleted(Me, New ProductsRowChangeEvent(CType(e.Row,ProductsRow), e.Action))
            End If
        End Sub
        
        Protected Overrides Sub OnRowDeleting(ByVal e As DataRowChangeEventArgs)
            MyBase.OnRowDeleting(e)
            If (Not (Me.ProductsRowDeletingEvent) Is Nothing) Then
                RaiseEvent ProductsRowDeleting(Me, New ProductsRowChangeEvent(CType(e.Row,ProductsRow), e.Action))
            End If
        End Sub
        
        Public Sub RemoveProductsRow(ByVal row As ProductsRow)
            Me.Rows.Remove(row)
        End Sub
    End Class
    
    Public Class ProductsRow
        Inherits DataRow
        
        Private tableProducts As ProductsDataTable
        
        Friend Sub New(ByVal rb As DataRowBuilder)
            MyBase.New(rb)
            Me.tableProducts = CType(Me.Table,ProductsDataTable)
        End Sub
        
        Public Property ProductID As Integer
            Get
                Return CType(Me(Me.tableProducts.ProductIDColumn),Integer)
            End Get
            Set
                Me(Me.tableProducts.ProductIDColumn) = value
            End Set
        End Property
        
        Public Property ProductName As String
            Get
                Return CType(Me(Me.tableProducts.ProductNameColumn),String)
            End Get
            Set
                Me(Me.tableProducts.ProductNameColumn) = value
            End Set
        End Property
        
        Public Property SupplierID As Integer
            Get
                Try 
                    Return CType(Me(Me.tableProducts.SupplierIDColumn),Integer)
                Catch e As InvalidCastException
                    Throw New StrongTypingException("Cannot get value because it is DBNull.", e)
                End Try
            End Get
            Set
                Me(Me.tableProducts.SupplierIDColumn) = value
            End Set
        End Property
        
        Public Property CategoryID As Integer
            Get
                Try 
                    Return CType(Me(Me.tableProducts.CategoryIDColumn),Integer)
                Catch e As InvalidCastException
                    Throw New StrongTypingException("Cannot get value because it is DBNull.", e)
                End Try
            End Get
            Set
                Me(Me.tableProducts.CategoryIDColumn) = value
            End Set
        End Property
        
        Public Property QuantityPerUnit As String
            Get
                Try 
                    Return CType(Me(Me.tableProducts.QuantityPerUnitColumn),String)
                Catch e As InvalidCastException
                    Throw New StrongTypingException("Cannot get value because it is DBNull.", e)
                End Try
            End Get
            Set
                Me(Me.tableProducts.QuantityPerUnitColumn) = value
            End Set
        End Property
        
        Public Property UnitPrice As Decimal
            Get
                Try 
                    Return CType(Me(Me.tableProducts.UnitPriceColumn),Decimal)
                Catch e As InvalidCastException
                    Throw New StrongTypingException("Cannot get value because it is DBNull.", e)
                End Try
            End Get
            Set
                Me(Me.tableProducts.UnitPriceColumn) = value
            End Set
        End Property
        
        Public Property UnitsInStock As Short
            Get
                Try 
                    Return CType(Me(Me.tableProducts.UnitsInStockColumn),Short)
                Catch e As InvalidCastException
                    Throw New StrongTypingException("Cannot get value because it is DBNull.", e)
                End Try
            End Get
            Set
                Me(Me.tableProducts.UnitsInStockColumn) = value
            End Set
        End Property
        
        Public Property UnitsOnOrder As Short
            Get
                Try 
                    Return CType(Me(Me.tableProducts.UnitsOnOrderColumn),Short)
                Catch e As InvalidCastException
                    Throw New StrongTypingException("Cannot get value because it is DBNull.", e)
                End Try
            End Get
            Set
                Me(Me.tableProducts.UnitsOnOrderColumn) = value
            End Set
        End Property
        
        Public Property ReorderLevel As Short
            Get
                Try 
                    Return CType(Me(Me.tableProducts.ReorderLevelColumn),Short)
                Catch e As InvalidCastException
                    Throw New StrongTypingException("Cannot get value because it is DBNull.", e)
                End Try
            End Get
            Set
                Me(Me.tableProducts.ReorderLevelColumn) = value
            End Set
        End Property
        
        Public Property Discontinued As Boolean
            Get
                Return CType(Me(Me.tableProducts.DiscontinuedColumn),Boolean)
            End Get
            Set
                Me(Me.tableProducts.DiscontinuedColumn) = value
            End Set
        End Property
        
        Public Property CategoriesRow As CategoriesRow
            Get
                Return CType(Me.GetParentRow(Me.Table.ParentRelations("CategoriesProducts")),CategoriesRow)
            End Get
            Set
                Me.SetParentRow(value, Me.Table.ParentRelations("CategoriesProducts"))
            End Set
        End Property
        
        Public Function IsSupplierIDNull() As Boolean
            Return Me.IsNull(Me.tableProducts.SupplierIDColumn)
        End Function
        
        Public Sub SetSupplierIDNull()
            Me(Me.tableProducts.SupplierIDColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IsCategoryIDNull() As Boolean
            Return Me.IsNull(Me.tableProducts.CategoryIDColumn)
        End Function
        
        Public Sub SetCategoryIDNull()
            Me(Me.tableProducts.CategoryIDColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IsQuantityPerUnitNull() As Boolean
            Return Me.IsNull(Me.tableProducts.QuantityPerUnitColumn)
        End Function
        
        Public Sub SetQuantityPerUnitNull()
            Me(Me.tableProducts.QuantityPerUnitColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IsUnitPriceNull() As Boolean
            Return Me.IsNull(Me.tableProducts.UnitPriceColumn)
        End Function
        
        Public Sub SetUnitPriceNull()
            Me(Me.tableProducts.UnitPriceColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IsUnitsInStockNull() As Boolean
            Return Me.IsNull(Me.tableProducts.UnitsInStockColumn)
        End Function
        
        Public Sub SetUnitsInStockNull()
            Me(Me.tableProducts.UnitsInStockColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IsUnitsOnOrderNull() As Boolean
            Return Me.IsNull(Me.tableProducts.UnitsOnOrderColumn)
        End Function
        
        Public Sub SetUnitsOnOrderNull()
            Me(Me.tableProducts.UnitsOnOrderColumn) = System.Convert.DBNull
        End Sub
        
        Public Function IsReorderLevelNull() As Boolean
            Return Me.IsNull(Me.tableProducts.ReorderLevelColumn)
        End Function
        
        Public Sub SetReorderLevelNull()
            Me(Me.tableProducts.ReorderLevelColumn) = System.Convert.DBNull
        End Sub
    End Class
    
    Public Class ProductsRowChangeEvent
        Inherits EventArgs
        
        Private eventRow As ProductsRow
        
        Private eventAction As System.Data.DataRowAction
        
        Public Sub New(ByVal row As ProductsRow, ByVal action As DataRowAction)
            MyBase.New
            Me.eventRow = row
            Me.eventAction = action
        End Sub
        
        Public ReadOnly Property Row As ProductsRow
            Get
                Return Me.eventRow
            End Get
        End Property
        
        Public ReadOnly Property Action As DataRowAction
            Get
                Return Me.eventAction
            End Get
        End Property
    End Class
End Class