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Public Function Create() As Object Dim result As New EditableRoot() ' initialize the new object with default data MarkNew(result) Return result End Function Public Function Fetch(ByVal criteria _ As SingleCriteria(Of EditableRoot, Integer)) As Object Dim result As New EditableRoot() ' load the new object with data based on the criteria MarkOld(result) Return result End Function Public Function Update(ByVal obj As Object) As Object ' insert, update or delete the data for obj MarkOld(obj) Return obj End Function Public Sub Delete(ByVal criteria As SingleCriteria(Of EditableRoot, Integer)) ' delete data based on the criteria End Sub End Class The object factory assumes complete responsibility for creating and interacting with the business object, including setting the object s state by calling the protected methods from the ObjectFactory base class: MarkNew() and MarkOld(). Although the object factory model requires more code and effort, it does provide more flexibility, and it can provide better separation between the business and data access logic.

Most applications will have some editable child objects, or even grandchild objects. Examples of these include the ProjectResource and ResourceAssignment objects from the Project Tracker reference application. In many cases, the child objects are contained within a child collection object, which I ll discuss later in this chapter. In other cases, the child object might be referenced directly by the parent object. Either way, the basic structure of a child object is the same; in some ways, this template is similar to the editable root:

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If you need something stronger than type affinity for domain integrity, then CHECK constraints can help. You can implement pseudo strict typing directly using a single built-in function and a CHECK constraint. As mentioned earlier, SQLite has a function that returns the inferred storage class of a value typeof(). You can use typeof() in any relational expression to test for a value type. Here s an example:

Figure 2-2. The default client page for the StockTraderService Web service The Service Description link will display the WSDL document in a tree view like format, wherein you can collapse and expand individual elements. This format is very useful for working your way through the document and learning how it is structured. Alternatively, you can copy the WSDL document from the browser window and then view it in an XML document editing application.

<Serializable()> _ Public Class EditableChild Inherits BusinessBase(Of EditableChild) #Region "Business Methods" ' TODO: add your own fields, properties, and methods ' example with private backing field Private Shared IdProperty As PropertyInfo(Of Integer) = _ RegisterProperty(New PropertyInfo(Of Integer)("Id"))Integer)("Id")) Private _Id As Integer = IdProperty.DefaultValue Public Property Id() As Integer Get Return GetProperty(IdProperty, _Id) End Get Set(ByVal value As Integer) SetProperty(IdProperty, _Id, value) End Set End Property ' example with managed backing field Private Shared NameProperty As PropertyInfo(Of String) = _ RegisterProperty(New PropertyInfo(Of String)("Name")) Public Property Name() As String Get Return GetProperty(NameProperty) End Get Set(ByVal value As String) SetProperty(NameProperty, value) End Set End Property #End Region #Region "Validation Rules" Protected Overrides Sub AddBusinessRules() ' TODO: add validation rules 'ValidationRules.AddRule(RuleMethod, NameProperty) End Sub #End Region #Region "Authorization Rules" Protected Overrides Sub AddAuthorizationRules() ' TODO: add authorization rules 'AuthorizationRules.AllowWrite(NameProperty, "Role") End Sub Private Shared Sub AddObjectAuthorizationRules() ' TODO: add authorization rules 'AuthorizationRules.AllowEdit(GetType(EditableChild), "Role") End Sub #End Region #Region "Factory Methods" Friend Shared Function NewEditableChild() As EditableChild Return DataPortal.CreateChild(Of EditableChild)() End Function Friend Shared Function GetEditableChild( _ ByVal childData As Object) As EditableChild Return DataPortal.FetchChild(Of EditableChild)(childData) End Function

sqlite> 0 sqlite> 0 sqlite> 1 sqlite> 1 sqlite> 1 select typeof(3.14) = 'text'; select typeof(3.14) = 'integer'; select typeof(3.14) = 'real'; select typeof(3) = 'integer'; select typeof('3') = 'text';

Private Sub New() ' Require use of factory methods End Sub #End Region #Region "Data Access" Protected Overrides Sub Child_Create() ' TODO: load default values ' omit this override if you have no defaults to set MyBaseChild_Create() End Sub Private Sub Child_Fetch(ByVal childData As Object) ' TODO: load values End Sub Private Sub Child_Insert(ByVal parent As Object) ' TODO: insert values End Sub Private Sub Child_Update(ByVal parent As Object) ' TODO: update values End Sub Private Sub Child_DeleteSelf(ByVal parent As Object) ' TODO: delete values End Sub #End Region End Class As with all business classes, this one is serializable and inherits from a CSLA NET base class The fact that it is a child object is specified by the data portal calls to CreateChild() and FetchChild() in the factory methods.

Therefore, you can use this function to implement a CHECK constraint that limits the acceptable types allowed in a column:

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