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#End Region #Region "Data Access" Private Sub DataPortal_Fetch(ByVal criteria _ As SingleCriteria(Of EditableRootList, Integer)) RaiseListChangedEvents = False ' TODO: load values into memory Dim childData As Object = Nothing For Each item In DirectCast(childData, List(Of Object)) MeAdd(EditableChildGetEditableChild(item)) Next RaiseListChangedEvents = True End Sub #End Region End Class The Authorization Rules region implements the AddObjectAuthorizationRules() method to define the roles that can interact with the object This is the same as with an editable root object, and the UI developer can use this information to enable and disable UI elements accordingly Also, the data portal uses these rules to ensure only authorized users are able to create, get, edit, or delete the collection object The one difference is that this AddObjectAuthorizationRules() method only needs to define the roles allowed to get the object The Factory Methods region implements factory methods to create, retrieve, and (optionally) delete the collection.

As we ve noted already, we require different implementations for each browser type being supported, so we ve separated out the details. Let s look at each implementation, beginning with the Mozilla implementation, shown in listing 12.16.

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The methods rely on the data portal to do much of the work, ultimately delegating the call to the appropriate DataPortal_XYZ method In the Data Access region, the DataPortal_Fetch() method is responsible for getting the data from the database using whatever data access technology you choose This is often LINQ to SQL, the ADONET Entity Framework, or raw ADONET In any case, the Data Access layer must return the child data as a result so it can use it to load each individual child object with data You load each child object by calling the child object s factory method, passing the object s data as a parameter The resulting child object is added to the collection The DataPortal_Fetch() method sets the RaiseListChanged Events property to False before changing the collection and then restores it to True once the operation is complete.

We ve mentioned that we think natural primary keys are a bad idea. Natural keys often make it difficult to refactor the data model when business requirements change. They may even, in extreme cases, impact performance. Unfortunately, many legacy schemas use (natural) composite keys heavily, and, for the very reason that we discourage the use of composite keys, it may be difficult to change the legacy schema to use surrogate keys. Therefore, Hibernate supports the use of natural keys. If the natural key is a composite key, support is via the <compositeid> mapping. The second category of problems can usually be solved using a custom Hibernate mapping type (a UserType or CompositeUserType), as described in chapter 6. Let s look at some examples that illustrate the solutions for both problems. We ll start with natural key mappings. Mapping a table with a natural key Our USER table has a synthetic primary key, USER_ID, and a unique key constraint on USERNAME. Here s a portion of our Hibernate mapping:

management. If that is enabled, there is a chance that the database will increase the size of your buffer cache defeating the math I ve worked out.

As you ll see shortly, the Address Book and Address Book UI frameworks ultimately provide different ways of accessing the Contacts data information: you might be working with the Address Book programmatically, or a user may be making selections through fancy UIs. Ways to select individual contacts may vary, but after a contact has been selected, you ll generally use the same getter and setter functions to work with that record. These important functions are listed in table 9.4.

Setting this property to False tells the base BindingList(Of T) class to stop raising the ListChanged event When doing batches of updates or changes to a collection, this can increase performance The BusinessListBase class includes a default implementation of the DataPortal_Update() method, which loops through all child objects (and deleted child objects) to ensure the appropriate Child_XYZ method is called on each when the collection is being saved Normally this is the desired behavior, but you can override DataPortal_Update() if you need to take control of the update process for some unusual scenario As with the editable root stereotype, you can use the ObjectFactory attribute to have the data portal invoke an object factory rather than invoke the DataPortal_XYZ methods directly in the business class Collection objects that inherit from BusinessListBase automatically support data binding in WPF, Windows Forms, and Web Forms.

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