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the database administrator will be optimized with the data model in mind, and perhaps will spur tweaks in the database configuration and indexes Stored procedures abstract the structure of the data from the application, which can help when changes are needed in the data model by having a central location for all query changes In programming, this is referred to as class or package encapsulation The stored procedures represent a black box, where developers don t need to be familiar with the internals of the procedure As long as developers know how to call the procedure and how the results will come back, they can be ignorant about the procedure details Where security is important, stored procedures allow controlled access to viewing and changing data.

Life3D delegates the hard work of managing the tray icon and popup menu to the Life3DPopup class, which is instantiated in Life3D s constructor: // globals private WrapLife3D w3d = null; private Desktop desktop = null;

This clearly saves device resources and prevents unexpected battery drain, but it is a real nuisance in terms of maintaining the state of a game If people playing your game are interrupted by a phone call or have to quickly switch over to the calendar to set up an appointment, the chances are that they will want to return to where they were in your game and continue from where they left off Unfortunately, the game was closed as soon as they navigated away from it The onus is upon us to perform whatever steps are necessary to restore the game to its previous state once it is reactivated This state management requirement is a reasonably complex area of functionality, but is essential for consideration in your games It is also something best implemented into your game as soon as possible so that it can be constantly tested during development.

Callers do not need to have permission on specific tables; if their query can be encapsulated in a stored procedure, they need only the ability to access that procedure 15 has more details about creating and managing permissions, and database security is covered in 16 Using stored procedures means you are passing a single parameter or a small list of parameters to the database Compared with building SQL statements in your application to pass to the database, the parameterized call is more secure If you re building SQL on the fly in your code, you might be more open to attacks like SQL injection, where attackers attempt to spoof your program and alter your dynamically built query to expose, change, or destroy your data Some databases optimize the statements of your stored procedure, parsing and organizing the pieces of the procedure when it is created.

Trying to add this feature into a game that has already been written can be time-consuming at best, and nearly impossible at worse..

2 This reduces the amount of work necessary when the procedure is called, meaning that queries and operations in the procedure are faster than if they were sent from the client to parse and process at run time..

// in the Life3D constructor Life3DPopup lpop = new Life3DPopup(this, w3d, desktop); The constructor s references to Life3D (this) and the WrapLife3D object (w3d) are needed for method calls from the popup menu. It can call the Life3D method changeIconify() to iconify or deiconify the application, and finishOff() to terminate the application. It can call the WrapLife3D method adjustSpeed() to adjust the rotation speed of the grid and adjustColour() to change the scene s background color. The Desktop reference is required so the menu can start the OS s default text editor and e-mail client.

Let s start by understanding the problem. Load up the HighScores example project from the previous chapter and start it running (on the emulator or on a real device). Once it has launched, click the phone s hardware Back button and observe what happens. The phone returns to the home screen, and the Visual Studio IDE breaks out of run mode and returns to edit mode. Clearly, the game has stopped running. You can see, therefore, that clicking the Back button while in your game explicitly closes the application.