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You can see that we get the last name returned as element data for our Authors element. We may want to make the last name an element itself nested under the Authors element. To do this, we modify our query slightly to use the element directive as shown here: SELECT 1 as Tag, NULL as Parent, au_id as [Authors!1!au_id], au_lname as [Authors!1!au_lname!element] FROM Authors FOR XML EXPLICIT Table 7-7 lists all the directives you can use with a description for each.

Figure 6-49. The Transfer SQL Server Objects Task has lots of properties but is still straightforward.

VS provides information about the collection that you can access through the debugging windows or (new to VS 2005) by hovering the cursor over the word Parameters on the previous line If you open the node for cmdParameters in the Autos window, VS will display the values of its public and nonpublic properties To examine the SqlParameter object that our code added to the collection, open the Non-Public members node and then the _items node We added only one parameter, so it appears as item [0], which you can see in Figure 9-3..

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Wraps the data in a CDATA section. Specifies that you want the element entity encoded (for example, > becomes >) and represented as a subelement. If you want to generate elements generated for null values, you can specify this directive. This will create an element with an attribute xsi:nil=TRUE. Allows you to specify an ID for your element. All ID directives require that XMLDATA be requested in your FOR XML clause. Allows attributes to specify ID type attributes to enable intradocument linking. Similar to IDREF in that it allows you to create intradocument linking, but uses the IDREFS structure rather than IDREF. Hides the result from the XML rendered. Same as the element directive, but no encoding takes place. Useful for OPENXML overflow columns in that it retrieves the column and appends it to the document.

Let s look at a more complex example. If we want to return all our authors with their titles and author royalties, we would generate a UNION ALL query to combine together this data from disparate tables, and we would need to nest the results so that our XML hierarchy appears correctly with authors, royalties, and then titles. Before we look at the query and results, we want to give you a couple of tips about troubleshooting FOR XML EXPLICIT queries. First, many people get the error that the parent tag isn t open yet. To troubleshoot your FOR XML EXPLICIT statements, the easiest way to fix problems is to remove the FOR XML EXPLICIT statement and just render the results. This will return the universal table, and you can track down errors. The easiest way we ve found to solve the parent tag problem is to make sure to include the tag column in your ORDER BY clause so that you know that no later tags will be rendered before earlier tags, which is the cause of the problem.

The Web Service Task consumes a web service method. I anticipate this task will be widely used, so it warrants a detailed explanation and example. As you might expect, this task takes care of all the hard work in consuming a web service. There is no messing around with building SOAP envelopes or the like. You simply configure the task to make the call.

Database principals are the objects that represent users to which we can assign permissions to access databases or particular objects within a database. Whereas logins operate at the server level and allow us to perform actions such as connecting to a SQL Server, database principals operate at the database level, allowing us to select or manipulate data, to perform DDL statements on objects within the database, or to manage users permissions at the database level. SQL Server 2005 recognizes four different types of database principals: Database users Database roles Database groups Application roles

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