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If you make high-priority changes to the privilege system for instance, because a security violation was detected and you want to take immediate action you will want to know exactly when MySQL will use the privileges you have changed. When you change a user s database-level access and privileges (those stored in mysql.db), the new privileges will take effect after the next issue of a USE db_name statement. While this is okay for most web-based systems, where a new USE statement is issued on each HTTP request, this can be more problematic if the offending user is logged in to a persistent session (a console or client/server application session). If the security risk is high, you may be forced to KILL the offending user s process (identified using the SHOW FULL PROCESSLIST command) in order to ensure a new USE db_name request is generated. When you make changes to the user s global privileges, as well as passwords, the next time the correct privileges will be read is when a new connection request is received with the same identification tag. Again, it may be necessary in some situations to identify the offending process IDs and KILL the processes to effectively log out the offending user. When you change a user s table or column-level privileges, the new privileges will take effect on the very next request to the server, so, in general, you do not need to worry about enforcing privilege changes at that level.

Better still, it is easy to send the user back to the Marketplace from your trial game so that they can quickly and easily purchase the full version Exactly how you decide to limit your game is entirely up to you You might limit the number of levels that are available, restrict or remove certain features of the game, put a limit on the experience levels that the player can gain, disable the game s scoring, put a time limit in place, show ads, nag users periodically to upgrade and avoid the reminder messages, or any combination of these The Marketplace doesn t tell you how to work in trial mode; it simply tells you that the game is running in that mode One limitation is a timed evaluation period.

Each planet is a Java 3D Sphere, with a blended material and texture appearance, located at a fixed position in the scene. The planets don t rotate. The OrbitBehavior is attached to the viewing platform in the scene graph s view branch, so is not shown in Figure 8-3. The Background node is an optional component. It ll become useful when the background image is smaller than the canvas, a scenario I discuss in the Some Variations on a Theme section of this chapter.

MySQL AB released the GUI tools MySQL Administrator and MySQL Query Browser in different stages over 2004. New database administrators will find the GUI tools more intuitive than their command-line counterparts. In some cases, particularly for user management tasks, the GUI can reduce a number of fairly repetitive SQL statements down to a few clicks of the mouse. Here, we ll discuss how to use the MySQL Administrator tool to manage user accounts. Your first step is to set up your connection to the server. Then you can navigate to the User Administration section and use those tools to add and remove accounts, as well as specify user privileges.

It is common in many applications to allow the game to work without any restrictions at all for a period of time (perhaps a week or a month) and then to stop working entirely It is easy enough to monitor the installation date of your game, but when the trial elapses the user can simply uninstall and reinstall Uninstallation removes all the isolated storage data from the game, so it is unable to tell after reinstallation that it had ever been installed before Of course, you can simply view the fact that the user has to uninstall and reinstall as being sufficiently irritating that they will eventually decide to pay to avoid the repeated annoyance However you do decide to limit your game, try to ensure that a representative sample is offered so that your potential customers can decide whether the game appeals to them.

The WrapPlanets3D()constructor creates the 3D canvas in the standard way and attaches a SimpleUniverse to it: // globals private static final int PWIDTH = 512; private static final int PHEIGHT = 512; private SimpleUniverse su; // size of panel

privileges (database administrator). Otherwise, all the options detailed here are unavailable (grayed-out) to you.

While you should not hide the trial status from your user, it is often a good idea to prompt the user to purchase at an opportune moment perhaps at a cliffhanger point in the game or just as an exciting new feature is introduced When the player is itching for more, the likelihood of buying the game is increased..