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XML is a hierarchical text markup language, easily readable by human beings, that is typically used for data exchange within and between systems. Because XML itself is such a big topic, it can t be covered within the scope of this book. A basic understanding of XML is a prerequisite for this lesson.

Unless otherwise stated, all examples shown in this lesson use the AdventureWorks sample database for SQL Server 2008.

' VB Public Class TraceMessageBehavior Implements IEndpointBehavior // C# public class TraceMessageBehavior : IEndpointBehavior

For reference, a simple example of an XML document containing two customers (denoted by the <Customer> tag), each with a few orders (denoted by the <Order> tag), is shown here:

The IEndpointBehavior interface requires the implementation of four methods. Three (AddBindingParameters, Validate, and ApplyDispatchBehavior) are not part of this exercise, so they can be left stubbed.

< xml version="1.0" > <Customers> <Customer Id="1" AccountNumber="AW00000001" Type="S"> <Orders> <Order Id="43860" OrderDate="2001-08-01T00:00:00" ShipDate="2001-08-08T00:00:00" /> <Order Id="44501" OrderDate="2001-11-01T00:00:00" ShipDate="2001-11-08T00:00:00" /> <Order Id="45283" OrderDate="2002-02-01T00:00:00" ShipDate="2002-02-08T00:00:00" /> <Order Id="46042" OrderDate="2002-05-01T00:00:00" ShipDate="2002-05-08T00:00:00" /> </Orders> </Customer> <Customer Id="2" AccountNumber="AW00000002" Type="S"> <Orders> <Order Id="46976" OrderDate="2002-08-01T00:00:00" ShipDate="2002-08-08T00:00:00" /> <Order Id="47997" OrderDate="2002-11-01T00:00:00" ShipDate="2002-11-08T00:00:00" /> <Order Id="49054" OrderDate="2003-02-01T00:00:00" ShipDate="2003-02-08T00:00:00" /> <Order Id="50216" OrderDate="2003-05-01T00:00:00" ShipDate="2003-05-08T00:00:00" /> <Order Id="51728" OrderDate="2003-08-01T00:00:00" ShipDate="2003-08-08T00:00:00" /> <Order Id="57044" OrderDate="2003-11-01T00:00:00" ShipDate="2003-11-08T00:00:00" /> <Order Id="63198" OrderDate="2004-02-01T00:00:00" ShipDate="2004-02-08T00:00:00" /> <Order Id="69488" OrderDate="2004-05-01T00:00:00" ShipDate="2004-05-08T00:00:00" /> </Orders> </Customer> </Customers>

6

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As mentioned, the previous code sample is an XML document. In this lesson, XML fragments also are discussed. XML fragments are similar to XML documents; the difference is that they are not in themselves a document. Sound strange The thought is just that an XML fragment is supposed to be part of an XML document, that is, it has been taken out of the context of the document. This means that an XML fragment lacks the XML declaration (< xml. . .>) and does not have to have a root element (such as <Customers> in the previous example). Here is an example of an XML fragment:

13. Add the following methods to the TraceMessageBehavior class:

<Order Id="43860" OrderDate="2001-08-01T00:00:00" ShipDate="2001-08-08T00:00:00" /> <Order Id="44501" OrderDate="2001-11-01T00:00:00" ShipDate="2001-11-08T00:00:00" /> <Order Id="45283" OrderDate="2002-02-01T00:00:00" ShipDate="2002-02-08T00:00:00" />

' VB Public Sub AddBindingParameters(endpoint As ServiceEndpoint, _ bindingParameters As BindingParameterCollection) _ Implements IEndpointBehavior.AddBindingParameters End Sub Public Sub Validate(endpoint As ServiceEndpoint) _ Implements IEndpointBehavior.Validate End Sub Public Sub ApplyDispatchBehavior(endpoint As ServiceEndpoint, _ endpointDispatcher As EndpointDispatcher) _ Implements IEndpointBehavior.ApplyDispatchBehavior End Sub // C# public void AddBindingParameters(ServiceEndpoint endpoint, BindingParameterCollection bindingParameters) { } public void Validate(ServiceEndpoint endpoint) { } public void ApplyDispatchBehavior(ServiceEndpoint endpoint, EndpointDispatcher endpointDispatcher) { }

Whether or not to use XML within a relational database system is often debated. As with most features, when and where to use it depends on the problem that you are trying to solve. XML can be used for several actions related to a database. The major uses are listed here:

Now that the unused methods have been dealt with, look at the one that actually has some code in it. To add a message inspector to the client, you use the ClientRuntime object. This object maintains a collection of the inspectors to be used on the client side. 14. Add the following method to the TraceMessageBehavior class:

Instead of passing scalar values to the database by issuing multiple data manipulation language (DML) statements or running a stored procedure multiple times, an XML document or fragment can be passed directly to the database.

' VB Public Sub ApplyClientBehavior(endpoint As ServiceEndpoint, _ clientRuntime As ClientRuntime) _ Implements IEndpointBehavior.ApplyClientBehavior Dim inspector As New MessageTracer() clientRuntime.MessageInspectors.Add(inspector) End Sub // C# public void ApplyClientBehavior(ServiceEndpoint endpoint, ClientRuntime clientRuntime) { MessageTracer inspector = new MessageTracer(); clientRuntime.MessageInspectors.Add(inspector); }

Passing data as XML to the database Storing and querying an actual XML document or fragment in the database This is one of the more controversial topics. Why would you store XML directly in a table There are several reasons, which are covered later in this lesson.

The third element in adding the inspector is to create an extension to house the behavior. This requires you to create another class.

After this lesson, you will be able to:

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