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Figure 7-2. Account schema that isn t normalized Each of the entities you see in Figure 7-2 represents a different type of user in the application. In order to get a list of all the names, logins, and passwords of all the users in this system, you would need to perform a UNION query similar to the one shown in Listing 7-21. (Note the required use of parentheses around the statements because of the ORDER BY clause.) Listing 7-21. UNION Query to Find System User Information ( SELECT first_name, last_name, login, password FROM CustomerServiceEmployee UNION SELECT first_name, last_name, login, password FROM WarehouseEmployee UNION SELECT first_name, last_name, login, password FROM Customer ) ORDER BY last_name, first_name; However, if the schema were properly normalized, to a form similar to Figure 7-3, the UNION would not be necessary, and instead could be a simple SELECT from a single table, Account, like so: SELECT first_name, last_name, login, password FROM Account;

The rumblers are accessed using Controller.getRumblers(), and one is chosen to be the rumbler offered by the class: // globals private Rumbler[] rumblers; private int rumblerIdx;

In addition to creating the geometry, most modeling applications also allow textures to be mapped on to the objects that they build and will provide the resulting texture coordinates They might also allow vertex normals to be calculated and stored as part of the object All this sounds wonderful, but unfortunately there is a bewildering array of formats into which 3D object definitions can be saved, and not all are easy to read Many such products can be used to create geometry files that can be used by our XNA games These range from free products such as the open source Blender (visit wwwblenderorg for details) to costly commercial applications such as Autodesk s 3ds Max (see wwwautodeskcom for more information), and many others in between Wikipedia has a large list of 3D modeling applications at http://enwikipedia.

Customer account_id created_on billing_address billing_city billing_province billing_postcode billing_country shipping_address shipping_city shipping_province shipping_postcode shipping_county

org/wiki/3D_computer_graphics_software, where you might be able to find other packages that suit your requirements The good news is that there is a modeling application available that is free to download, relatively easy to use, and (with a bit of creative tweaking) can save to a file format that you can easily read This application is Google s SketchUp..

private void findRumblers(Controller controller) { // get the gamepad's rumblers rumblers = controller.getRumblers(); if (rumblers.length == 0) { System.out.println("No Rumblers found"); rumblerIdx = -1; } else { System.out.println("Rumblers found: " + rumblers.length); rumblerIdx = rumblers.length-1; // use last rumbler } } // end of findRumblers() findRumblers() stores the index of the last rumbler in the rumblers array. There s no particular reason for this choice, except that in my gamepad it vibrates the left and right sides of the gamepad together.

Figure 7-3. Properly normalized account schema The point here is that if you find yourself dealing with UNIONs a lot, it may be time to take a closer look at your schema and get back to basics. The Account table in Figure 7-3 houses the attributes common to all system users, thus accomplishing the normalization step of removing redundant data columns. Similarly, the two types of employee data WarehouseEmployee and CustomerServiceEmployee have been stripped of their redundant Account data and contain only attributes specific to each entity. Although this brief discussion on proper normalization may come across as common sense to many of you who have experience using relational database management systems, we almost guarantee that in the course of your IT travels, you will run across this type of situation. Why In the world of object-oriented programming, it is natural, and sometimes encouraged, to create multiple classes for related objects. Sometimes these related objects correspond to a naturally normalized relational database model; other times they don t. In the latter case, object-oriented programmers with little database experience tend to translate their object model quite literally into the database schema. This is an all-too-common occurrence and is why you will often see schemas like the one shown in Figure 7-2.