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Database functions can be used in many ways, so you need to consider how to best use them for your applications. Throughout this book, we continue to emphasize careful consideration of the various database technologies as you design and implement your database. As you consider the possible uses for functions in your application and database, you should be thinking about how functions fit into the bigger picture and if a stored function in the database is the best choice for the required logic. To help you figure this out, let s take a look at how functions compare with some other database tools for manipulating data: stored procedures, views, and triggers. While we can t provide definitive answers as to where each tool fits best, we do suggest that you think carefully about your overall database and application architecture, and keep your use of the various database tools consistent and well documented.

private void initScripting() { // states array used by the scripting rules states = new boolean[NUM_NEIGHBOURS+1]; // includes self state for (int i=0; i <= NUM_NEIGHBOURS; i++) states[i] = false; // create a script engine manager ScriptEngineManager factory = new ScriptEngineManager(); if (factory == null) { System.out.println("Could not create script engine manager"); usingScript = false; return; } // create a JavaScript engine engine = factory.getEngineByName("js"); if (engine == null) { System.out.println("Could not create javascript engine"); usingScript = false; return; } // create a compilable engine compEngine = (Compilable) engine; if (compEngine == null) { System.out.println( "Could not create a compilable javascript engine"); usingScript = false; return; } // add states[] array reference to engine engine.put("states", states); } // end of initScripting() The states[] array has 27 elements, one for each cell neighbor and one for the cell itself. The states[] array is added to the engine at the end of initScripting(). Since it s an object, any future changes to the data in states[] will be seen by the script when it s executed.

As you would expect, this template creates an empty class library project, ready to be populated and referenced from other Silverlight projects. Apart from some project references and a blank class file, projects created from this template are completely blank.

The syntax for defining the body of stored functions includes the same set of statements defined for stored procedures, covered in 9 As we ve discussed, MySQL s stored procedures provide a rich set of syntax to perform logic operations in the database Like the body of a procedure, the function body can include things like variables and flow constructs to encapsulate both small and large pieces of functionality So why not just use stored procedures then While you can do a lot with stored procedures, they aren t always the best fit for encapsulating pieces of logic Furthermore, creating a stored procedure for each piece of logic can be overkill, and needing to call and then process the results from a procedure is sometimes more work that it s worth if you need only a small piece of data to use in another query.

As in the previous version of CellsGrid, state change is a two-stage operation: first the next state is calculated for every cell, and then all the cells are updated. The first stage may use rules or birth and die ranges: // globals // number of cells along the x-, y-, and z- axes private final static int GRID_LEN = 10;

This template creates a project based around one of the Metro user interface s new paradigms: the Panorama. Panoramic page layouts are to be found in many areas of the core phone operating system and many applications built on top of it. The organization of the Panorama consists of an extra wide, horizontally scrolling page, inside of which are distinct columns of data. By swiping left or right, the user can navigate between these columns. The individual columns can be different in presentation and style, and will often include a vertical scrolling component to allow more content to be contained than can fit on the screen. The vertical columns are sized so that the next column to the right is just visible, giving a visual clue to the user that more content is available than that presented on the screen. Further indications of this are contained within the Panorama title, which is displayed in a large font that usually stretches off the right edge of the screen. This is an important configuration for many applications, but as with the databound application, it is less likely to be useful for us as a basis for writing games.