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Figure 12-16. Displaying the results of a query through XML and XSLT Remember that when you interact with your data as XML, all the customary database-oriented concepts such as relationships and unique constraints go out the window. The only reason you should interact with your DataSet as XML is if you need to perform an XML-specific task. You shouldn t use XML manipulation to replace the approaches used in earlier chapters to update data. In most cases, you ll find it easier to use advanced controls such as the GridView, rather than creating a dedicated XSL stylesheet to transform data into the HTML you want to display.

SQL Server 2000 and later provide built-in support for XML. You can execute any query and return the results as an XML fragment by adding the FOR XML clause to your query. This feature is completely separate from the XML features of the DataSet. However, it gives you another way to retrieve data from one or more tables in a database and work with it as XML.

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On the other hand, the method has a default behavior that s suitable for most backends, but some may have different file naming requirements, and would require a new method to override it Two other methods, and , have still further requirements By definition, both of these require special handling for each different storage system, but they shouldn t be overridden directly in most situations They provide additional logic beyond what s necessary to store and retrieve files, and that logic should be maintained Instead, they defer the interaction with the actual storage mechanism to and , respectively, which have a simpler set of expectations The and arguments are the same as , but it no longer has the logic to deal with, so can focus solely on returning a object suitable for accessing the requested file.

An XML fragment contains valid XML syntax, but isn t necessarily a valid document of its own. Usually, this is because there is no root element. An XML document requires all elements to be nested in a single root element.

The FOR XML clause supports a specialized syntax that allows you to specify the exact structure and naming of the resulting document. However, this syntax doesn t conform to any XML standard, and it s notoriously messy. As a result, XML queries often use one of the two default XML representations that SQL Server provides. The first is FOR XML AUTO.

For example, if you execute this query: SELECT FirstName, LastName FROM Employees FOR XML AUTO you ll receive results like this: <Employees FirstName="Nancy" LastName="Davolio"/> <Employees FirstName="Andrew" LastName="Fuller"/> <Employees FirstName="Janet" LastName="Leverling"/> ... As you can see, each record is a separate element, with all the fields as attributes. The other easy option is FOR XML AUTO, ELEMENTS. Here s an example: SELECT FirstName, LastName FROM Employees FOR XML AUTO, ELEMENTS In this case, the data you ll receive uses separate elements for each row and each field, as shown here: <Employees> <FirstName>Nancy</FirstName> <LastName>Davolio</LastName> </Employees> <Employees> <FirstName>Andrew</FirstName> <LastName>Fuller</LastName> </Employees> <Employees> <FirstName>Janet</FirstName> <LastName>Leverling</LastName> </Employees>

The arguments here are the same as , but the name provided here will have already gone through and , and the content is guaranteed to be a instance This allows the method to focus solely on committing the file s content to the storage system with the given name..

You can also fine-tune the format in much more painstaking detail using the FOR XML EXPLICIT syntax. For example, this allows you to convert some fields to attributes and others to elements. Refer to the SQL Server Books Online for more information. Unfortunately, the FOR XML query syntax is specific to SQL Server and isn t supported by other database products.

To perform an XML query, you must use the SqlCommand.ExecuteXmlReader() method. This method returns an XmlReader with the results of your query as an XML fragment. You can move through the XmlReader one node at a time in a forward-only direction in the same way you use the XmlTextReader. In fact, XmlTextReader derives from XmlReader. Here s the code needed to retrieve and display a customer list on a web page: // Define the command. string customerQuery = "SELECT FirstName, LastName FROM Employees FOR XML AUTO, ELEMENTS"; SqlConnection con = new SqlConnection(connectionString); SqlCommand com = new SqlCommand(customerQuery, con); // Execute the command. StringBuilder str = new StringBuilder(); try { con.Open(); XmlReader reader = com.ExecuteXmlReader();

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