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Pages in a B-tree consist of B-tree records, also called payloads. They are not database records in the sense you might think formatted with the columns in a table. They are more primitive than that. A Btree record, or payload, has only two fields: a key field and a data field. The key field is the rowid value or primary key value that is present for every table in the database. The data field, from the B-tree perspective, is an amorphous blob that can contain anything. Ultimately, the database records are stored inside the data fields. The B-tree s job is order and navigation, and it primarily needs only the key field to do its work (however, there is one exception in B+trees, which is addressed next). Furthermore, payloads are variable size, as are their internal key and data fields. On average, each page usually holds multiple payloads; however, it is possible for a payload to span multiple pages if it is too large to fit on one page (for example, records containing blobs).

3. The UI calls the object s Save() or BeginSave() method. 4. The save method invokes the data portal just like it does when doing an insert or an update (as discussed earlier in this chapter). 5. The data portal does one of the following: When not using an ObjectFactory attribute, typically, the DataPortal_DeleteSelf() method calls the object s DataPortal_Delete() method, which contains the code needed to delete the object s data (and any related child data, and so on). When using an ObjectFactory attribute, the data portal creates an instance of the specified object factory class and invokes the specified delete method. This delete method contains the code needed to delete the business object s data, along with any related child data. When not using an ObjectFactory attribute, from the business object s perspective, one method is called: DataPortal_DeleteSelf(). Earlier in the chapter, Figure 4-12 showed the process of saving a root object; it also depicts deferred deletion. When an ObjectFactory attribute is specified on the business class, the business developer must provide both a factory class and the business class. The factory class must implement a delete method that removes the business object s data, along with any child object data. The CSLA .NET framework supports both deletion models to provide flexibility for the UI developer. It is up to the business object author to decide which model to support by implementing either a Shared or instance delete method on the object.

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Most business objects contain moderate amounts of data in their fields. For these, the default .NET garbage collection behavior is fine. With that behavior, you don t know exactly when an object will be destroyed and its memory reclaimed. But that s almost always OK because it is exactly what garbage collection is designed to do. However, the default garbage collection behavior may be insufficient when objects hold onto expensive or unmanaged resources until they re destroyed. These resources include things such as open database connections, open files on disk, synchronization objects, handles, and any other objects that already implement IDisposable. These are things that need to be released as soon as possible in order to prevent the application from wasting memory or blocking other users who might need to access a file or reuse a database connection. If business objects are written properly, most of these concerns should go away. Data access code should keep a database connection open for the shortest amount of time possible, and the same is true for any files the object might open on disk. However, there are cases in which business objects can legitimately contain an expensive resource something like a multimegabyte image in a field, perhaps.

B-tree records are stored in key order. All keys must be unique within a single B-tree (this is automatically guaranteed because the keys correspond to the rowid primary key, and SQLite takes care of that field for you). Tables use B+trees, which do not contain table data (database records) in the internal pages. Figure 11-1 shows an example B+tree representation of a table.

Experienced developers are comfortable with n-tier application architecture, in which the components of an application are broken out across separate layers, or tiers. At a minimum, this includes the three classic layers: user interface (front end), business layer (middle tier), and data layer (back end). Now let s consider how an SOA solution is broken out in terms of layers and constituent components. Figure 1-3 illustrates a basic SOA solution.

In such cases, the business object should implement the IDisposable interface, which will allow the UI code to tell the business object to release its resources. This interface requires that the object implement a Dispose() method to actually release those resources: <Serializable()> _ Public Class MyBusinessClass Inherits BusinessBase(Of MyBusinessClass) Implements IDisposable Private _disposedValue As Boolean Protected Sub Dispose(ByVal disposing As Boolean)

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