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As you start down the road to role-based management, begin with a list of the roles that can be played by database users in your system. For this section, we will return to our toy store sample schema. After a few minutes of thinking about the different types of users that will have access to the database server, we come up with the following list: Database Administrators Database Users The Database Administrators group (role) is fairly self-explanatory. For our Database Users role, we can further break down the list to the following: Super Users: Users who have access to all databases and can do all simple table-related tasks, as well as have full rights on a database named tmp. Regular Users: Users who have access to specified databases and may do simple tablerelated tasks. Designers: Users who have all database-related access and privileges on some databases (schema). We want to ensure that users belonging to each role (and sub-role) have only the privileges that they need to do their activities, and no more. Also, we re assuming here that Super Users have some general database knowledge and know how to use MySQL, so we ve given them a database (tmp) to use for their own measures. Thus, we put together a matrix to show which global and database level privileges member users should be granted as defaults, as shown in Table 15-8. This kind of table serves as an important written policy to guide database administrators for large projects. This document should be maintained as changes to the account management system are implemented. Table 15-8. Role-Privilege Matrix for the Toy Store Database Server

Figure 8-7. The galaxy (Source: NASA/JPL-Caltech) This image is part of the scene in Figure 8-8.

If it is a Silverlight game, the first screen is actually presented by the game itself and does not count the SplashScreenImagejpg that is automatically displayed by the Silverlight environment The time between launching and the game first accepting input must not exceed 20 seconds These launch time requirements also apply when the game is being reactivated after having been tombstoned In this environment, if they take longer than 10 seconds to reawaken, the process might be killed by the operating system Handling the Back button comes in for some specific attention The requirements are as follows: Pressing Back on the game s first screen must exit the game Pressing Back anywhere else within a game must return the player either to the previous screen or to an in-game pause menu Pressing Back again while such a menu is open should close the menu and return to the game.

NONE SELECT, INSERT, UPDATE, DELETE on all schema; ALL on schema called tmp SELECT, INSERT, UPDATE, DELETE on select schema ALL on select schema

Figure 8-8. Planets in a galaxy The easiest way of creating a black background is to not add a Background node to the scene at all; black is the default background color. The call to addBackground() can be commented out in WrapPlanets3D. Figure 8-8 also shows that I ve repositioned the image. I changed the (x, y) coordinates supplied to drawAndFlushImage() in preRender(): public void preRender() { render2D.drawAndFlushImage(backIm, 150, 100, this); }

You should therefore offer an Exit Game option within the menu Whenever Back is pressed while a context menu or dialog is open, the menu or dialog should close without any additional navigation taking place..

Now, we have a working strategy for setting defaults for our system s users based on their roles. You would use a list like the one in Table 15-8 as a reference when making account management changes. Instead of remembering the exact privileges a specific user account should be granted, you need to know only which role a new user will play. Finally, you might streamline the process of account management further, by encapsulating the account management into stored procedures or shell scripts that add appropriate permissions based on these well-defined roles.

The handling of the Back button is a common reason for submission failure, so ensure that it behaves appropriately within all game modes and screens.

A major benefit of rendering the background using a subclass of Canvas3D is that the image is a BufferedImage rather than a Java 3D Background node. This makes it easier to apply Java 2D effects to the image at runtime, such as rotation, fading, scaling, and various color adjustments. In this section, I describe how to rotate the background image. Figure 8-9 shows two screenshots of the SpinPlanets3D application taken a few seconds apart.

In this chapter, we ve covered a number of topics related to user account management. Here, is a simple list of strategies we consider to be best practices: Grant as few privileges as is absolutely necessary for users to accomplish their daily activities. Avoid using WITH GRANT OPTION. Avoid issuing any global privileges to anyone but the topmost database administrator.6 Keep privileges as simple as possible. If you don t need table or column-level privileges, don t use them. This only slows down the access control system and overcomplicates your setup. Think in terms of role-based management. This will allow you to more effectively manage large groups of users by grouping them by like activities. Use scripts to consolidate role-based management into a secure, well-organized environment.