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Stored procedures in MySQL are a welcome and exciting addition to the 5.0 release. While there s a lot of power, and perhaps some efficiency, in moving logic into your database, it s important to consider if and how procedures fit into your existing application. Hasty decisions based on excitement to use cool technology usually lead to problems down the road. As mentioned in the chapter, users should exercise caution in adopting the stored procedure functionality until the stability of the 5.0 server matches their environment requirements. For most users, waiting for the stable release is probably the best choice. MySQL s choice of SQL:2003 provides a good set of statements for developing procedures and a standard for potential inter-database procedure exchange. MySQL provides a good set of tools for creating, altering, dropping, and viewing procedures. As MySQL developers continue to develop and flush out their implementation of stored procedures, we look forward to further developments of the stored procedure functionality and anxiously await the stable release of the 5.0 branch of MySQL. In the next chapter, we ll look at stored functions, another technology available in MySQL versions 5.0 and later.

Let s take a quick tour through the past and present of Silverlight so that we can understand its evolution into the product that we use today.

In the beginning, there was Windows Presentation Foundation (WPF). This technology, introduced by Microsoft in 2006 as part of .NET 3.0, was for desktop PC development and introduced a new graphics API. Prior to this, 2D rendering in Windows was generally performed using the aging Graphics Device Interface (GDI). GDI has its strengths, but rendering games and fast-moving animated graphics are not among them. The majority of operations performed using GDI are driven by the processor rather than by the graphics hardware, limiting the performance of applications that use it. WPF dramatically improves on these capabilities by offloading the graphics rendering onto the graphics hardware via the DirectX rendering system. As a result of this change, vastly improved levels of

In the world of open-source databases, PostgreSQL (http://www.postgresql.org) is the other guy. With out-of-the-box database-level features rivaling that of Oracle and SQL Server stored procedures, triggers, views, constraints, and clustering many have wondered why this capable database has not gained the same level of popularity that MySQL has. Many features found only in either MySQL s InnoDB storage engine or the latest development versions of MySQL have been around in PostgreSQL for years. Yet the database server has been plagued by a reputation for being somewhat hard to work with and having a propensity to corrupt data files. For the most part, developers choosing PostgreSQL over MySQL have done so based on the need for more advanced functionality not available in MySQL until later versions. It s worth mentioning that the PostgreSQL licensing model is substantially different from MySQL s model. It uses the Berkeley open-source licensing scheme, which allows the product to be packaged and distributed along with other commercial software as long as the license is packaged along with it.

It s useful to organize longer, more complex scripts into functions and then call specific script functions from the Java side. This is possible with the Invocable interface, another optional part of the JSR 223 specification, which is supported by the Rhino engine. First, the script is stored in the engine, then its functions can be called after casting the engine to an Invocable object, as shown here: // store the script function engine.eval("function sayHello(name) {" + " println('Hello ' + name);" + "}"); // invoke the function Invocable invocableEngine = (Invocable) engine; Object[] fnArgs = {"Andrew"}; // function argument try { invocableEngine.invokeFunction("sayHello", fnArgs); } catch(NoSuchMethodException e) { System.out.println(e); } catch(ScriptException e) { System.out.println(e); } If a function requires input arguments, they must be supplied in an Object[] array. In the example, sayHello() takes a single string argument; I supplied Andrew, and the function printed Hello Andrew.

performance can be obtained with less load to the CPU itself, allowing the processor instead to focus on tasks such as data processing, game logic, and so on. The sophisticated rendering abilities of the graphics hardware can also be taken advantage of by WPF, allowing for a much richer visual display. Graphics hardware can easily rotate, scale, perform alpha blending and transparency effects, and perform other visual transformations; so all this functionality becomes immediately available to the WPF user interface. 3D graphics rendering is also supported. One of the important features of WPF is a layout engine that allows flexible and complex user interface designs to be specified. This engine uses a declarative language called XAML (short for eXtensible Application Markup Language and pronounced zammal ) to define the contents of the screens generated by WPF. We will be spending quite some time looking at XAML in this chapter.