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Exercise 2 Specify Fault Behaviors for the Service In this exercise, you will build on the service from the previous exercise and add some fault contracts that show consumers when and what type of faults might be issued by your service In this case, at the very least, any time a consumer is invoking one of the operations that require a specific task number to identify a task that is currently being managed by the service, there is a chance that the user is submitting a task number not currently being managed by the service In such a case, the service can issue a fault to the client to let the client know 1 Navigate to the <InstallHome>/1/Lesson1/Exercise2/<language>/Before directory and double-click the Exercise2sln file to open the solution in Visual Studio..

Take a Practice Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

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As shown in the previous example, the WHERE clause is used in most cases to limit the number of rows returned in the result set. Including well-written WHERE clauses typically increases query performance by limiting the amount of data that needs to be sent back to the client application.

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The solution consists of the three projects you ended with at the end of Exercise 1, Defining a Service, with the only difference being that the TaskClient project has already been modified to take into account the fault specifications you are about to declare on the service. 2. Define a FaultInfo class that you ll use to provide the information to be carried as the fault s payload. To do this, add the following to the ITaskManagerService interface file above the interface definition:

For more in-depth information about how SQL Server processes queries and about advanced querying techniques, see Inside Microsoft SQL Server 2008: T-SQL Querying (Microsoft Press, 2009), by Itzik Ben-Gan, Lubor Kollar, Steve Kass, and Dejan Sarka.

' VB <DataContract(Namespace:= _ "http://schemas.fabrikam.com/2008/04/tasks/")> _ Public Class FaultInfo <DataMember()> _ Public Reason As String = Nothing End Class // C# [DataContract( Namespace = "http://schemas.fabrikam.com/2008/04/tasks/")] public class FaultInfo { [DataMember()] public string Reason = null; }

The WHERE clause can include a variety of search conditions that can include Boolean operators and predicates such as LIKE , BETWEEN, EXISTS, IS NULL, IS NOT NULL, and CONTAINS. As mentioned earlier, the IS (IS NOT) NULL clause returns rows based on the existence of NULL values in the named column. The CONTAINS clause is available only when you create a full text index on the column being compared. For more information about full text searches, see 8, Extending Microsoft SQL Server Functionality with the Spatial, Full-Text Search, and Service Broker. Boolean operators, which include AND, OR, and NOT, can be used to define more than one criterion in a WHERE clause. The following sample code returns only products that have a color attribute of Silver and also have a list price greater than $200:

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The following sample assumes that the Product table includes newly added products that do not yet have a list price assigned to them. The following sample code includes Silver products with a price over $200, as well as the new Silver products with a list price of $0 (the default list price for new products added). If the parentheses were not added, the query would return Silver products with a price over $200 and all colors of products with a list price of $0 because of the order in which the conditions are evaluated, which is based on the Boolean order of operations:

The purpose of the class is to direct a copy of the message to the Trace output device (which defaults, in Visual Studio, to a debug window). 6. Create a method called TraceMessage that creates a copy of the Message object and uses it in a WriteLine method by adding the following code to the beginning of the MessageTracer class:

SELECT * FROM Production.Product WHERE Color = 'Silver' AND (ListPrice > 200 OR ListPrice = 0)

' VB Private Function TraceMessage(buffer As MessageBuffer) As Message Dim msg as Message = buffer.CreateMessage() System.Diagnostics.Trace.WriteLine("Message contents" & _ msg.ToString()) Return buffer.CreateMessage() End Function // C# private Message TraceMessage(MessageBuffer buffer) { Message msg = buffer.CreateMessage(); System.Diagnostics.Trace.WriteLine("Message contents" + msg.ToString()); return buffer.CreateMessage(); }

When the database engine parses and compiles a query, conditions that include Boolean operators are evaluated in the following order: NOT, AND, OR. This order of operations is important to understand because misunderstanding this can cause the query to return an unintended result set. You can use parentheses to control the order of operations.

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