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DWR, JSON-RPC, and SAJAX We ll begin by looking at three small server-side frameworks together, because they share a common approach, although they are written for different serverside languages. SAJAX works with a variety of server-side languages, including PHP Python, Perl, and Ruby. DWR (which stands for Direct Web Remoting) is a , Java-based framework with a similar approach, exposing methods of objects rather than standalone functions. JSON-RPC (JavaScript Object Notation-based Remote Procedure Calls) is also similar in design. It offers support for server-side JavaScript, Python, Ruby, Perl, and Java. All three allow objects defined on the server to expose their methods directly as Ajax requests. We will frequently have a server-side function that returns a useful result that has to be calculated on the server, say, because it looks up a value from a database. These frameworks provide a convenient way to access those functions or methods from the web browser and can be a good way of exposing the server-side domain model to the web browser code. Let s look at an example using SAJAX, exposing functions defined on the server in PHP. We ll use a straightforward example function that simply returns a string of text, as follows:

A dashboard layout is a personal choice that varies from user to user, so the best report style to use for a dashboard is the free-form style. We re going to make use of one Rectangle report item in this example, which will hold a jazzy logo, and a List report item for the RSS news feed from Yahoo. We will make this dashboard a Windows Forms application sitting on your desktop. You can click it as often you want to get the latest news headlines. When you are finished with this example, your dashboard should look similar to the one shown in Figure 13-11.

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The CollectValues() method then iterates the items in the work queue, obtaining both the Lead object and the action to be taken. For Insert, the code simply passes the Lead object to the DataContext using the InsertOnSubmit() method. For updates, it has to first query the record from the database and then apply the updates from the Lead object in the work queue. In this project, once a Lead is inserted, the only changes that are allowed are to assign it, so the code updates only the Status and AssignedTo columns. Once all the items in the work queue have been completed, the SubmitChanges() method is called to make the updates. They will not be committed, however, until the entire persistence operation has completed. The last step is to remove all the items from the work queue. Now that the work is done, they can be removed. You don t want to take action on them again the next time the instance is persisted.

if ( result == System.Windows.Forms.DialogResult.OK ) {

Another feature relating to bind variables is the use of the cursor_sharing parameter. The cost of parsing and optimizing is so high, and reduces scalability so much, that Oracle Corp. created the cursor_sharing parameter to allow developers a backdoor into sharable cursors. When the parameter cursor_sharing is set to the value force, the optimizer will replace (almost) any literal constants in your SQL (and some of your PL/SQL) with system-generated bind variables, and check to see whether there is a previously generated sharable cursor that could be used for this modified statement. Because of the switch to bind variables, cursor_sharing has a big impact on the effectiveness of histograms. (Of course, after converting the literal constants to bind variables, 9i then peeks at the actual values if it has to optimize the statement.)

1. We will continue working from the SimplePrinting project we created in the previous section. In the PrintFormatted delegate, add a new instance of the PrintDocument class, wire up the PrintPage event, and call the Print method. private void PrintFormatted(object sender, RoutedEventArgs e) { PrintDocument doc = new PrintDocument(); doc.PrintPage += (s, args) => { }; doc.Print("Formatted Print"); }

Because consumers of enumerations are free to stop enumerating at any time, in practice this sort of enumeration will just keep going until the calling code decides to stop. We ll see some slightly more practical uses for this when we explore parallel execution and multithreading later in the book. The concept of chaining lazy enumerations together shown in Example 7-35 is a very useful technique it s the basis of the most powerful feature that was added in version 3 of C#: LINQ. LINQ is such an important topic that the next chapter is devoted to it. But before we move on, let s review what we ve seen so far.

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