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,c.AccountNumber ,( SELECT TOP(1) soh.SalesOrderID FROM Test.SalesOrderHeader AS soh WHERE soh.CustomerID = c.CustomerID ORDER BY OrderDate DESC ) AS SalesOrderID ,( SELECT TOP(1) soh.OrderDate FROM Test.SalesOrderHeader AS soh WHERE soh.CustomerID = c.CustomerID ORDER BY OrderDate DESC ) AS OrderDate FROM Test.Customer AS c WHERE c.TerritoryID = 2;

public string Result {

9

get {

Record the total query cost of Query 1. (You can find the value in the Execution Plan tab by moving the pointer over the SELECT operator and locating the value named Estimated Subtree Cost.)

this.RaiseExceptionIfNecessary();

In the existing query window, type, highlight, and execute Query 2, shown here, to test the performance of a query that uses an OUTER APPLY:

return ((string)(this.results[0]));

XmlValidatingReader. The following example demonstrates how to create an instance of XmlReader that validates the specified file using an event handler shown afterwards.

} } }

-- Query 2 SELECT c.CustomerID ,c.AccountNumber ,o.* FROM Test.Customer AS c OUTER APPLY ( SELECT TOP(1) soh.SalesOrderID, soh.OrderDate FROM Test.SalesOrderHeader AS soh WHERE soh.CustomerID = c.CustomerID ORDER BY OrderDate DESC ) AS o WHERE c.TerritoryID = 2;

If you examine this code closely, you ll probably see the specific code that allows for asynchronous invocation. (Hint: look for async.) Now, change the original code defi nition slightly to call the GetCompanyNameAsync method:

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' VB Dim aReader As Xml.XmlReader Dim settings As New Xml.XmlReaderSettings() settings.ValidationType = Xml.ValidationType.Schema AddHandler settings.ValidationEventHandler, AddressOf settings_ValidationEventHandler aReader = Xml.XmlReader.Create("C:\myfile.xml", settings) // C# System.Xml.XmlReader aReader;

'VB Public Sub GetTickerSymbol() Dim Lookup As New StockLookupService() Console.WriteLine(Lookup.GetCompanyNameAsync("MSFT")) End Sub //C# public static void GetTickerSymbol() { StockLookupService Lookup = new StockLookupService(); Console.WriteLine(Lookup.GetCompanyNameAsync("MSFT")); }

In the existing query window, type, highlight, and execute Query 3, shown here, to test the performance of a query that uses ROW_NUMBER:

If you try to compile and run this code, it fails, indicating that the return type from the method call isn t valid. Lest there be any confusion, this modified code won t work. That s because calling an asynchronous method is a little more involved. The answer to why the return type from the method call is no longer valid rests in the proxy class, the relevant portions of which are provided here:

System.Xml.XmlReaderSettings settings = new System.Xml.XmlReaderSettings();

'VB Public Overloads Sub GetCompanyNameAsync(ByVal tickerSymbol As String) Me.GetCompanyNameAsync(tickerSymbol, Nothing)

,c.AccountNumber ,c.TerritoryID ,soh.SalesOrderID ,soh.OrderDate ,ROW_NUMBER() OVER (PARTITION BY c.CustomerID ORDER BY soh.OrderDate DESC) AS RowNo FROM Test.Customer AS c LEFT OUTER JOIN Test.SalesOrderHeader AS soh ON soh.CustomerID = c.CustomerID ) SELECT a.CustomerID ,a.AccountNumber ,a.SalesOrderID ,a.OrderDate FROM a WHERE a.RowNo = 1 AND a.TerritoryID = 2;

7

In this exercise, you execute the three queries mentioned in the practice preface and record each query s cost. In this case, the parameter supplied to all three queries (TerritoryID, shown below in bold type) yields a larger result set of 3,433 rows (compared to 64 rows in Exercise 1).

settings.ValidationType = System.Xml.ValidationType.Schema;

End Sub Public Overloads Sub GetCompanyNameAsync(ByVal tickerSymbol As String, _

ByVal userState As Object)

1. 2.

Me.GetCompanyNameOperationCompleted = _ AddressOf Me.OnGetCompanyNameOperationCompleted End If Me.InvokeAsync("GetCompanyName", New Object() {tickerSymbol}, _ Me.GetCompanyNameOperationCompleted, userState)

The XmlReader class is an abstract class that provides uncached, forward-only access to XML contained in a file or stream. XmlReader is implemented in the XmlTextReader, XmlNodeReader, and XmlValidatingReader classes. You can also obtain an instance of a default implementation of XmlReader via the XmlReader.Create method. The Read method reads the current node of the XML content in XmlReader and advances the reader to the next node. Once a node has been read, it cannot be revisited by that instance of XmlReader. Attributes can be read with the MoveToAttribute method. While using the MoveToAttribute method, you can freely move back and forth between attributes in an element. This is the only exception to forward-only access in the XmlReader class. The XmlReader.MoveToContent method can be used to skip noncontent-contain ing nodes and move the reader to the next content-containing node. XmlValidatingReader validates the XML reader by XmlReader against an inline or referenced schema. When a validation error occurs, a ValidationError event is raised, which you can handle. The ValidationErrorEventArgs instance passed in that event provides information about the validation error. You can also validate XML with the XmlReader class.

//C# public void GetCompanyNameAsync(string tickerSymbol) {

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