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The final line of code in LoadContent calls into a new function named ResetGame, in which we create the objects that will do the work when the game is running; its code is shown in Listing 3 21 Listing 3 21 Resetting the game private void ResetGame() { TextObject message; // Remove any existing objects GameObjectsClear(); // Add 10 boxes and 10 calls for (int i = 0; i < 10; i++) { GameObjectsAdd(new BoxObject(this, Textures["Box"])); GameObjectsAdd(new BallObject(this, Textures["Ball"])); } // Add some text message = new TextObject(this, Fonts["Kootenay"], new Vector2(240, 400), "Windows Phone 7 Game Development", TextObjectTextAlignmentCenter, TextObjectTextAlignmentCenter); messageSpriteColor = ColorDarkBlue; messageScale = new Vector2(10f, 15f); GameObjectsAdd(message); } ResetGame first removes any objects that might have been added to the game host earlier on.

main record, is absent while the child records exist. We cover how to handle orphaned records and data inconsistencies in 8.

Although this will never happen in our example because the game is reset only once, in a proper game this could be called each time the player runs out of lives in order to prepare a new game To stop the previous game from leaving debris behind, we would need to remove those objects that the previous game had been using The game then loops to add ten boxes and ten balls to the game host These are created using the derived game object classes that we have been discussing over the last few pages It also adds a TextObject instance to display the writing in the middle of the screen No custom functionality is needed for this object, so the TextObject class is instantiated directly All that is left is to implement the Update and Draw functions, both of which can be seen in Listing 3 22.

ControllerReadTest opens a window for each input device (controller) it detects and reports the current status of the components. A component is a widget on the device that generates input, such as a button, stick axis, or hat key. On my machine, ControllerReadTest opens three subwindows for the keyboard, the mouse, and the gamepad. Figure 11-7 shows the window for the gamepad.

An application that generates inconsistent data is a maintenance nightmare. It requires a database administrator s constant attention and can produce inaccurate, unreliable reports. The most effective way to ensure that an application cannot store inconsistent data is to ensure that the database itself enforces relationships through foreign key constraints. While it is true that the application code could be fixed to prevent the adding of the child records without a parent record, the only way to ensure consistent data is to provide for the relation through the database. Astute readers may correctly point out that the scenario outlined in this example could also have been prevented through the use of transactions (see 3, where we cover transaction processing, including topics related to data consistency and constraints). While this is true, transactions are not enforced at the table level of the database, and, like the application code in the example, a poorly written transaction could just as easily produce the same effect. Unfortunately, inconsistent data is common in many MySQL-based database applications for two reasons: MySQL makes it painfully easy to create table structures that have no inherent referential integrity (MyISAM tables). This has been pointed out by many experts on database systems, and their complaints have been the major catalyst for an increased use of InnoDB table structures and features such as constraints in later versions of MySQL.1 Because of the availability and easy installation of MySQL, programmers with little-tono knowledge of database design have created a flurry of LAMP-based applications2 based on poor database designs.

As you can see, these are absolutely trivial, just telling the game host to perform the required updates and drawing Listing 3 22 Updating and drawing the game protected override void Update(GameTime gameTime) { // Allows the game to exit if (GamePadGetState(PlayerIndexOne)ButtonsBack == ButtonStatePressed) thisExit(); // Update all the game objects UpdateAll(gameTime); baseUpdate(gameTime); }.

Figure 11-7. The gamepad window in ControllerReadTest The window is updated as I press the sticks, hat, and buttons. Each component name in the window is followed by a component identifier in brackets. Below each name is the component s current status. For example, the POV hat appears in row 3, column 2 of the window, and is given the name Hat Switch, the identifier POV, and has the status LEFT. The use of identifiers isn t always consistent; a close look at Figure 11-7 shows that the z identifier is used in row 1, column 2, and in row 1, column 3.