_categories.vb

EasyObjects 是ORM的典型应用的例子是学习研究的很好的范例

#End Region

#Region " String Properties "
		Public Overridable Property s_CategoryID As String
			Get
				If Me.IsColumnNull(CategoriesSchema.CategoryID.FieldName) Then
					Return String.Empty
				Else
					Return MyBase.GetIntegerAsString(CategoriesSchema.CategoryID.FieldName)
				End If
			End Get
			Set(ByVal Value As String)
				If String.Empty = value Then
					Me.SetColumnNull(CategoriesSchema.CategoryID.FieldName)
				Else
					Me.CategoryID = MyBase.SetIntegerAsString(CategoriesSchema.CategoryID.FieldName, Value)
				End If
			End Set
		End Property

		Public Overridable Property s_CategoryName As String
			Get
				If Me.IsColumnNull(CategoriesSchema.CategoryName.FieldName) Then
					Return String.Empty
				Else
					Return MyBase.GetStringAsString(CategoriesSchema.CategoryName.FieldName)
				End If
			End Get
			Set(ByVal Value As String)
				If String.Empty = value Then
					Me.SetColumnNull(CategoriesSchema.CategoryName.FieldName)
				Else
					Me.CategoryName = MyBase.SetStringAsString(CategoriesSchema.CategoryName.FieldName, Value)
				End If
			End Set
		End Property

		Public Overridable Property s_Description As String
			Get
				If Me.IsColumnNull(CategoriesSchema.Description.FieldName) Then
					Return String.Empty
				Else
					Return MyBase.GetStringAsString(CategoriesSchema.Description.FieldName)
				End If
			End Get
			Set(ByVal Value As String)
				If String.Empty = value Then
					Me.SetColumnNull(CategoriesSchema.Description.FieldName)
				Else
					Me.Description = MyBase.SetStringAsString(CategoriesSchema.Description.FieldName, Value)
				End If
			End Set
		End Property


#End Region

#Region " Where Clause "
    Public Class WhereClause

        Public Sub New(ByVal entity As EasyObject)
            Me._entity = entity
        End Sub
		
		Public ReadOnly Property TearOff As TearOffWhereParameter
			Get
				If _tearOff Is Nothing Then
					_tearOff = new TearOffWhereParameter(Me)
				End If

				Return _tearOff
			End Get
		End Property

		#Region " TearOff's "
		Public class TearOffWhereParameter
		
			Private _clause as WhereClause
			
			Public Sub New(ByVal clause As WhereClause)
				Me._clause = clause
			End Sub

			Public ReadOnly Property CategoryID() As WhereParameter
				Get
					Dim wp As WhereParameter = New WhereParameter(CategoriesSchema.CategoryID)
                    Dim query As NCI.EasyObjects.DynamicQuery = Me._clause._entity.Query
                    query.AddWhereParameter(wp)
					Return wp
				End Get
			End Property

			Public ReadOnly Property CategoryName() As WhereParameter
				Get
					Dim wp As WhereParameter = New WhereParameter(CategoriesSchema.CategoryName)
                    Dim query As NCI.EasyObjects.DynamicQuery = Me._clause._entity.Query
                    query.AddWhereParameter(wp)
					Return wp
				End Get
			End Property

			Public ReadOnly Property Description() As WhereParameter
				Get
					Dim wp As WhereParameter = New WhereParameter(CategoriesSchema.Description)
                    Dim query As NCI.EasyObjects.DynamicQuery = Me._clause._entity.Query
                    query.AddWhereParameter(wp)
					Return wp
				End Get
			End Property

			Public ReadOnly Property Picture() As WhereParameter
				Get
					Dim wp As WhereParameter = New WhereParameter(CategoriesSchema.Picture)
                    Dim query As NCI.EasyObjects.DynamicQuery = Me._clause._entity.Query
                    query.AddWhereParameter(wp)
					Return wp
				End Get
			End Property

	End Class
	
	#End Region	

		Public ReadOnly Property CategoryID() As WhereParameter 
			Get
				If _CategoryID_W Is Nothing Then
					_CategoryID_W = TearOff.CategoryID
				End If
				Return _CategoryID_W
			End Get
		End Property

		Public ReadOnly Property CategoryName() As WhereParameter 
			Get
				If _CategoryName_W Is Nothing Then
					_CategoryName_W = TearOff.CategoryName
				End If
				Return _CategoryName_W
			End Get
		End Property

		Public ReadOnly Property Description() As WhereParameter 
			Get
				If _Description_W Is Nothing Then
					_Description_W = TearOff.Description
				End If
				Return _Description_W
			End Get
		End Property

		Public ReadOnly Property Picture() As WhereParameter 
			Get
				If _Picture_W Is Nothing Then
					_Picture_W = TearOff.Picture
				End If
				Return _Picture_W
			End Get
		End Property

		Private _CategoryID_W As WhereParameter = Nothing
		Private _CategoryName_W As WhereParameter = Nothing
		Private _Description_W As WhereParameter = Nothing
		Private _Picture_W As WhereParameter = Nothing

		Public Sub WhereClauseReset()

		_CategoryID_W = Nothing
		_CategoryName_W = Nothing
		_Description_W = Nothing
		_Picture_W = Nothing
			Me._entity.Query.FlushWhereParameters()

		End Sub
	
		Private _entity As EasyObject
		Private _tearOff As TearOffWhereParameter
    End Class	

	Public ReadOnly Property Where() As WhereClause
		Get
			If _whereClause Is Nothing Then
				_whereClause = New WhereClause(Me)
			End If
	
			Return _whereClause
		End Get
	End Property
	
	Private _whereClause As WhereClause = Nothing	
#End Region	

#Region " Aggregate Clause "
    Public Class AggregateClause

        Public Sub New(ByVal entity As EasyObject)
            Me._entity = entity
        End Sub
		
		Public ReadOnly Property TearOff As TearOffAggregateParameter
			Get
				If _tearOff Is Nothing Then
					_tearOff = new TearOffAggregateParameter(Me)
				End If

				Return _tearOff
			End Get
		End Property

		#Region " TearOff's "
		Public class TearOffAggregateParameter
		
			Private _clause as AggregateClause
			
			Public Sub New(ByVal clause As AggregateClause)
				Me._clause = clause
			End Sub

			Public ReadOnly Property CategoryID() As AggregateParameter
				Get
					Dim ap As AggregateParameter = New AggregateParameter(CategoriesSchema.CategoryID)
                    Dim query As NCI.EasyObjects.DynamicQuery = Me._clause._entity.Query
                    query.AddAggregateParameter(ap)
					Return ap
				End Get
			End Property

			Public ReadOnly Property CategoryName() As AggregateParameter
				Get
					Dim ap As AggregateParameter = New AggregateParameter(CategoriesSchema.CategoryName)
                    Dim query As NCI.EasyObjects.DynamicQuery = Me._clause._entity.Query
                    query.AddAggregateParameter(ap)
					Return ap
				End Get
			End Property

			Public ReadOnly Property Description() As AggregateParameter
				Get
					Dim ap As AggregateParameter = New AggregateParameter(CategoriesSchema.Description)
                    Dim query As NCI.EasyObjects.DynamicQuery = Me._clause._entity.Query
                    query.AddAggregateParameter(ap)
					Return ap
				End Get
			End Property

			Public ReadOnly Property Picture() As AggregateParameter
				Get
					Dim ap As AggregateParameter = New AggregateParameter(CategoriesSchema.Picture)
                    Dim query As NCI.EasyObjects.DynamicQuery = Me._clause._entity.Query
                    query.AddAggregateParameter(ap)
					Return ap
				End Get
			End Property

	End Class
	
	#End Region	

		Public ReadOnly Property CategoryID() As AggregateParameter 
			Get
				If _CategoryID_W Is Nothing Then
					_CategoryID_W = TearOff.CategoryID
				End If
				Return _CategoryID_W
			End Get
		End Property

		Public ReadOnly Property CategoryName() As AggregateParameter 
			Get
				If _CategoryName_W Is Nothing Then
					_CategoryName_W = TearOff.CategoryName
				End If
				Return _CategoryName_W
			End Get
		End Property

		Public ReadOnly Property Description() As AggregateParameter 
			Get
				If _Description_W Is Nothing Then
					_Description_W = TearOff.Description
				End If
				Return _Description_W
			End Get
		End Property

		Public ReadOnly Property Picture() As AggregateParameter 
			Get
				If _Picture_W Is Nothing Then
					_Picture_W = TearOff.Picture
				End If
				Return _Picture_W
			End Get
		End Property

		Private _CategoryID_W As AggregateParameter = Nothing
		Private _CategoryName_W As AggregateParameter = Nothing
		Private _Description_W As AggregateParameter = Nothing
		Private _Picture_W As AggregateParameter = Nothing

		Public Sub AggregateClauseReset()

		_CategoryID_W = Nothing
		_CategoryName_W = Nothing
		_Description_W = Nothing
		_Picture_W = Nothing
			Me._entity.Query.FlushAggregateParameters()

		End Sub
	
		Private _entity As EasyObject
		Private _tearOff As TearOffAggregateParameter
    End Class	

	Public ReadOnly Property Aggregate() As AggregateClause
		Get
			If _aggregateClause Is Nothing Then
				_aggregateClause = New AggregateClause(Me)
			End If
	
			Return _aggregateClause
		End Get
	End Property
	
	Private _aggregateClause As AggregateClause = Nothing	
#End Region	

End Class