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In most cases, this is where you d also load any child objects with data from the database as well: Protected Sub DataPortal_Fetch( _ ByVal criteria As SingleCriteria(Of RootType, Integer)) Using ctx = ContextManager(Of DataContext)GetManager("MyDatabase") ' load root object with data here ' get data for child here LoadProperty(ChildProperty, ChildGetChild(childData)) End Using End Sub There s a lot going on here, much of which is covered in 15 The important thing to realize is that the ChildGetChild() method is calling a factory method that creates an instance of the child object and loads that child object with data from the database In many cases the data for the child object(s) is already loaded from the database by the code here in the parent, but that s not required.

Extended operations Generalized projection Left outer join Right outer join Full outer join

Again, a LoadProperty() method is used to put the resulting child object into the managed backing field for the property The result is that when your root object is created or retrieved, DataPortal_Create() or DataPortal_ Fetch() is invoked, and they both load a child object into the property using the LoadProperty() method That value is then available to other business objects and the UI through the Public property Additionally, any calls to the parent object s IsValid and IsDirty properties automatically take into account the IsValid and IsDirty status of your child object And any change to the child object that results in a PropertyChanged or ListChanged will cause a ChildChanged event to be raised by the parent..

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The fundamental operations are just that: fundamental They define the basic relational operations, and all of them (with the exception of rename) have their basis in set theory The additional operations are for convenience, offering a shorthand way of performing frequently used combinations of the fundamental operations For instance, intersection can be performed by taking the union of two sets and from that removing via difference the results of two further unions that have each had difference applied for one of the two initial sets Finally, the extended operations add features to the fundamental and additional operations For example, the generalized projection operation adds arithmetic expressions, aggregates, and grouping features to the fundamental projection operations The outer joins extend the join operations and allow additional information and/or incomplete information to be retrieved from the database In standard ANSI SQL, select can perform every one of these relational operations.

Listing 8-8. Registering a Custom SoapReceiver Class public class StockTrader : System.Windows.Forms.Form { class StockTrader() { // Use TCP receiverUri = new Uri(String.Format( "soap.tcp://{0}/StockTraderSoapReceiver", System.Net.Dns.GetHostName())); // Register the SOAP receiver objects StockTraderRequestReceiver request = new StockTraderRequestReceiver(); SoapReceivers.Add(receiverUri, request); } }

It is very common to create a child object in the DataPortal_Fetch() method, so it can be efficiently loaded with data from the database as the parent object s data is also loaded. And that s a great approach. However, it seems unfortunate that you have to create a DataPortal_Create() method just to create an empty instance of a new child object. Many objects don t need to initialize values as they are created, so you wouldn t need to implement DataPortal_Create() at all in that case (because there s a default implementation of DataPortal_Create() already provided by BusinessBase). For the purpose of creating a new child object, you might choose to just create the child object on demand. In this case, you would not call LoadProperty() in the DataPortal_Create() method, as shown in the previous section. Instead, you d enhance the property declaration itself like this:

These operations map to the original relational operators defined by E F Codd in his original work on relational theory (with the exception of divide) SQLite supports all the relational operations in ANSI SQL with the exception of right and full outer joins The types of joins can be constructed using combinations of other fundamental relational operations, so don t fret their absence All of these operations are defined in terms of relations or, as they are commonly called, tables! They take one or more relations as their inputs and produce a relation as their output This allows operations to be strung together into relational expressions Relational expressions can therefore be created to arbitrary complexity.

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