dsproducts.vb

Mastering VBNet Include Source Code

        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 SuppliersRow As SuppliersRow
            Get
                Return CType(Me.GetParentRow(Me.Table.ParentRelations("SuppliersProducts")),SuppliersRow)
            End Get
            Set
                Me.SetParentRow(value, Me.Table.ParentRelations("SuppliersProducts"))
            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
    
    Public Class CategoriesDataTable
        Inherits DataTable
        Implements System.Collections.IEnumerable
        
        Private columnCategoryID As DataColumn
        
        Private columnCategoryName As DataColumn
        
        Private columnDescription As DataColumn
        
        Private columnPicture As DataColumn
        
        Friend Sub New()
            MyBase.New("Categories")
            Me.InitClass
        End Sub
        
        <System.ComponentModel.Browsable(false)>  _
        Public ReadOnly Property Count As Integer
            Get
                Return Me.Rows.Count
            End Get
        End Property
        
        Friend ReadOnly Property CategoryIDColumn As DataColumn
            Get
                Return Me.columnCategoryID
            End Get
        End Property
        
        Friend ReadOnly Property CategoryNameColumn As DataColumn
            Get
                Return Me.columnCategoryName
            End Get
        End Property
        
        Friend ReadOnly Property DescriptionColumn As DataColumn
            Get
                Return Me.columnDescription
            End Get
        End Property
        
        Friend ReadOnly Property PictureColumn As DataColumn
            Get
                Return Me.columnPicture
            End Get
        End Property
        
        Public Default ReadOnly Property Item(ByVal index As Integer) As CategoriesRow
            Get
                Return CType(Me.Rows(index),CategoriesRow)
            End Get
        End Property
        
        Public Event CategoriesRowChanged As CategoriesRowChangeEventHandler
        
        Public Event CategoriesRowChanging As CategoriesRowChangeEventHandler
        
        Public Event CategoriesRowDeleted As CategoriesRowChangeEventHandler
        
        Public Event CategoriesRowDeleting As CategoriesRowChangeEventHandler
        
        Public Overloads Sub AddCategoriesRow(ByVal row As CategoriesRow)
            Me.Rows.Add(row)
        End Sub
        
        Public Overloads Function AddCategoriesRow(ByVal CategoryName As String, ByVal Description As String, ByVal Picture() As Byte) As CategoriesRow
            Dim rowCategoriesRow As CategoriesRow = CType(Me.NewRow,CategoriesRow)
            rowCategoriesRow.ItemArray = New Object() {Nothing, CategoryName, Description, Picture}
            Me.Rows.Add(rowCategoriesRow)
            Return rowCategoriesRow
        End Function
        
        Public Function FindByCategoryID(ByVal CategoryID As Integer) As CategoriesRow
            Return CType(Me.Rows.Find(New Object() {CategoryID}),CategoriesRow)
        End Function
        
        Public Function GetEnumerator() As System.Collections.IEnumerator Implements System.Collections.IEnumerable.GetEnumerator
            Return Me.Rows.GetEnumerator
        End Function
        
        Private Sub InitClass()
            Me.columnCategoryID = New DataColumn("CategoryID", GetType(System.Int32), "", System.Data.MappingType.Element)
            Me.columnCategoryID.AutoIncrement = true
            Me.columnCategoryID.AllowDBNull = false
            Me.columnCategoryID.ReadOnly = true
            Me.columnCategoryID.Unique = true
            Me.Columns.Add(Me.columnCategoryID)
            Me.columnCategoryName = New DataColumn("CategoryName", GetType(System.String), "", System.Data.MappingType.Element)
            Me.columnCategoryName.AllowDBNull = false
            Me.Columns.Add(Me.columnCategoryName)
            Me.columnDescription = New DataColumn("Description", GetType(System.String), "", System.Data.MappingType.Element)
            Me.Columns.Add(Me.columnDescription)