ASP.NET Web PDF Document Viewer/Editor Control Library

language for querying XML data in SQL Server 2005. XQuery alone, however, can only query the data; it cannot modify it. So SQL Server 2005 also provides the XML Data Manipulation Language (XML DML) that extends XQuery with the capability to insert, update, and delete. Here s an example of using the value method within a standard SELECT query to retrieve just the first name from the CustomerData column. Select CustomerID, CustomerData.value( 'declare namespace CUST="http://sql2005/Customer.xsd"; /CUST:Customer/CUST:FirstName', 'varchar(30)') As FirstName From Customer3 Remember that the value method accepts two arguments: an XQuery expression and an SQL data type. In this case, the XQuery expression is declare namespace CUST="http://sql2005/Customer.xsd"; /CUST:Customer/CUST:FirstName The first line of this expression establishes a namespace alias. The second, more interesting line, is an XPath expression that retrieves the FirstName element node, which the value method converts to a varchar(30) data type. Full coverage of the XQuery language is well beyond the scope of this book. But remember, XQuery leans heavily on XPath, so past experience with XPath will drastically flatten the XQuery learning curve. In fact, many enhancements in XPath 2.0 were driven by the needs of the XQuery working group.

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Table 7-6 shows the logical I/Os performed with each fetch size. The third column shows the percentage of the logical I/Os for the current fetch size as compared to the previous fetch size. For example, logical I/Os for a fetch size of 20 were 50.78% of the logical I/Os for a fetch size of 10. Table 7-6. Logical I/Os with Changing Fetch Sizes

You can reference these two generated DLLs from F# Interactive using the following references: > #r @"C:\fsharp\WeatherForecast.dll";; > #r @"C:\fsharp\TerraService.dll";; You can now use these web services directly from F# Interactive: > open System;; > open WebReferences;; > let ws = new WeatherForecast();; val ws : WeatherForecast

SQL Server 2005 s integrated support for XML is truly impressive. However, an application developer s primary concern is moving data to and from the database, not how well the database handles XML. So all this XML integration means little if it doesn t also simplify retrieving XML data from the database into the application and saving XML data from the application to the database. Thanks to enhancements in ADO.NET 2.0, it is, indeed, the case that moving XML data to and from the database is much easier. You ll find the clue that this is true in the System.Data.DbType and System.Data.SqlDbType enumerations, which both now include an XML value. Furthermore, the System.Data.SqlTypes namespace contains a new SqlXml class that is a client-side representation of XML typed database columns. The following code shows these new features in action. private static void SaveCustomerXml() { // Create an XmlReader using a customer data file using (XmlReader custReader = new XmlTextReader( "CustomerData.xml")) // Create a connection to the database using (SqlConnection cnn = new SqlConnection(cnnString))

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> let weather = ws.GetWeatherByPlaceName("Los Angeles");; val weather : WeatherForecasts > let today = weather.Details.[0];; val today : WeatherData > printf "Temperature: %sF/%sC\n" today.MaxTemperatureF today.MaxTemperatureC;; Temperature: 100F/38C val it : unit = () > let ts = new TerraService();; val ts : TerraService > let place = new Place(City="Los Angeles", State="CA", Country="USA");; val place : Place > let facts = ts.GetPlaceFacts(place);; val facts : PlaceFacts > printfn "Lat/Lon: %f/%f" facts.Center.Lat facts.Center.Lon;; Lat/Lon: 33.833000/-118.217003

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