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SQL Server 2005 gets closest to the ideal notification solution, because the notification infrastructure is built into the database with a messaging system called Service Broker. The Service Broker manages queues, which are database objects that have the same standing as tables, stored procedures, or views. Essentially, you can instruct SQL Server 2005 to send notifications for specific events using the CREATE EVENT NOTIFICATION command. ASP .NET offers a higher-level model you register a query, and ASP.NET automatically instructs SQL Server 2005 to send notifications for any operations that would affect the results of that query. This mechanism works in a similar way to indexed views. Every time you perform an operation, SQL Server determines whether your operation affects a registered command. If it does, SQL Server sends a notification message and stops the notification process. When using notification with SQL Server, you get the following benefits over SQL Server 2000: Notification is much more fine-grained: Instead of invalidating your cached object when the table changes, SQL Server 2005 invalidates your object only when a row that affects your query is inserted, updated, or deleted. Notification is more intelligent: A notification message is sent when the first time the data is changed, but not if the data is changed again (unless you re-register for notification messages by adding an item back to the cache). Fewer configuration steps: You do not run aspnet_regsql to generate special tables or add polling settings to the web.config file.

Figure 12-2 shows the final web page that reads the DVDList.xml document and displays a list of elements, using different levels of indenting to show the overall structure. The XmlDocument stores information as a tree of nodes. A node is the basic ingredient of an XML file and can be an element, an attribute, a comment, or a value in an element. A separate XmlNode object represents each node, and nodes are grouped together in collections. You can retrieve the first level of nodes through the XmlDocument.ChildNodes property. In this example, that property provides access to the <DvdList> element. The <DvdList> element contains other child nodes, and these nodes contain still more nodes and the actual values. To drill down through all the layers of the tree, you need to use recursive logic, as shown in this example.

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Starts an absolute path from the root node. /DvdList/DVD selects all <DVD> elements that are children of the root <DvdList> element. This is the recursive descent operator that searches for descendants rather than children. //DVD/Title selects all the <Title> elements that are descendants of a <DVD> element. Selects an attribute of a node. /DvdList/DVD/@ID selects the attribute named ID from the <DVD> element. Selects a child element in the path. /DvdList/DVD/* selects all the elements that are direct children of the <DVD> element (which include <Title>, <Director>, <Price>, and <Starring> in this example). Combines multiple paths. /DvdList/DVD/ | Title//DvdList/DVD/Director selects both the <Title> and <Director> elements in the <DVD> element. Indicates the current node. Indicates the parent node. If the current node is <Title>, then .. refers to the <DVD> node. Define selection criteria that can test a contained node or attribute value. /DvdList/DVD[Title='Forrest Gump'] selects the <DVD> elements that contain a <Title> element with the indicated value. /DvdList/DVD[@ID='1'] selects the <DVD> elements with the indicated attribute value. You can use the and keyword to combine criteria.

The only configuration step you need to perform is to make sure your database has the ENABLE_BROKER flag set. You can perform this by running the following SQL (assuming you re using the Northwind database): Use Northwind ALTER DATABASE Northwind SET ENABLE_BROKER Notifications work with SELECT queries and stored procedures. However, some restrictions exist for the SELECT syntax you can use. To properly support notifications, your command must adhere to the following rules: You must fully qualify table names in the form [Owner].table, as in dbo.Employees (not just Employees). Your query cannot use an aggregate function, such as COUNT(), MAX(), MIN(), or AVERAGE(). You cannot select all columns with the wildcard * (as in SELECT * FROM Employees). Instead, you must specifically name each column so that SQL Server can properly track changes that do and do not affect the results of your query.

Figure 12-2. Retrieving information from an XML document When the example page loads, it creates an XmlDocument object and calls the Load() method, which retrieves the XML data from the file. It then calls a recursive function in the page class named GetChildNodesDescr(). GetChildNodesDescr() takes an XmlNodeList object as an input and the index of the nesting level. It then returns the string with the content for that node and all its child nodes and attributes. private void Page_Load(object sender, System.EventArgs e) { string xmlFile = Server.MapPath("DvdList.xml"); // Load the XML file in an XmlDocument. XmlDocument doc = new XmlDocument(); doc.Load(xmlFile); // Write the description text. XmlText.Text = GetChildNodesDescr(doc.ChildNodes, 0); }

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Here s an acceptable command: SELECT EmployeeID, FirstName, LastName, City FROM dbo.Employees These are the most important rules, but the SQL Server Books Online has a lengthy list of caveats and exceptions. If you break one of these rules, you won t receive an error. However, the notification message will be sent as soon as you register the command, and the cached item will be invalidated immediately.

You can test whether a cookieless session is currently being used by checking the IsCookielessSession property of the Session object.

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