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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.

Figure 13-1. An example of how an interface can be used to segregate business logic from the data tier

The BackgroundWorker also provides built-in support for tracking progress, which is useful for keeping the client informed about how much work has been completed in a long-running task.

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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.

To add support for progress, you need to first set the BackgroundWorker WorkerReportsProgress property to true Actually, providing and displaying the progress information is a two-step affair First, the DoWork event handling code needs to call the BackgroundWorkerReportProgress() method and provide an estimated percent complete (from 0 to 100) You can do this as often as you like Every time you call ReportProgress(), the BackgroundWorker fires the ProgressChanged event You can react to this event to read the new progress percentage and update the user interface Because the ProgressChanged event fires from the user interface thread, there s no need to use ControlInvoke() Supporting this pattern in the current example is a little more work Currently, the majority of the work is performed in response to a single method call WorkerFindPrimes() But to provide progress information, you need to call ReportProgress() during the prime search.

The data access object (DAO) is a design concept that abstracts and encapsulates access to a data source. The code that calls the DAO is hence shielded from the underlying implementation details of the data source. This is usually achieved by defining an interface between the data and logic tiers. The DAO also does the plumbing work required to communicate with the underlying data source it represents. Figure 13-2 illustrates how the DAO typically fits into the design architecture of an application.

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

To make this possible, you must split the search into several pieces, or give the Worker class the ability to report progress In this example, you ll see the second approach To add support to the Worker class, start by adding a third parameter to the FindPrimes() method, as shown here: public static int[] FindPrimes(int fromNumber, int toNumber, SystemComponentModelBackgroundWorker backgroundWorker) { .. } The FindPrimes() method is also changed to report progress periodically Reporting progress usually involves a calculation, an event, and a refresh of the form s user interface As a result, you want to cut down the rate of progress reporting to one or two updates per second In the FindPrimes() method, progress is reported only in one-percent increments: int iteration = listLength / 100; for (int i = 0; i < listLength; i++) { ...

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