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commit the changes until a final transaction COMMIT is encountered. What you need is a flow of events such as depicted in Figure 3-4.

One of the golden rules of improving data access performance is to reduce as much as possible the number of round-trips required to the database. This is because the amount of time required to send your SQL statements across the network is usually orders of magnitude higher than the amount of time needed to run the query at the server. There are two ways to reduce the number of database round trips: Placing multiple SQL statements in a single stored procedure on the server: This way, only a single round-trip is needed (to invoke the stored procedure) instead of making a round trip for each separate SQL statement. Encasing multiple SQL statements within an anonymous PL/SQL block: This is similar to the first method, except that you have the freedom of generating an anonymous PL/SQL block on the fly.

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Agents. This is one of the most advanced and time-consuming types of embedded Help. It was pioneered largely by Microsoft in Microsoft Office (and later abandoned). Microsoft s attitude toward agents is extremely schizophrenic it provides tools to make it easy for all developers to use this level of support, but it only occasionally devotes the intense coding time needed to integrate it into its flagship applications. Bidirectional. To some, this is a holy grail of embedded Help, but it s rarely achieved, and usually only in a primitive form. Essentially, one of the critical drawbacks with Help is that it s cut off from the applications in two ways. Not only does the user have to leave the application to read most Help files, but once the appropriate information is found in the Help file, the user has to perform the actual work. There s no way for the Help file to act on the user s behalf, and actually show the user how to do what is needed. Some Help files do provide rudimentary Show Me links that can prompt the application to display the appropriate window, but this communication is difficult and fragile. With bidirectional Help, Help can perform the necessary task once it determines what the user needs.

Figure 3-4. Behavior necessary to ensure atomicity As you can see in Figure 3-4, the behavior you need causes a flush of the data changes to disk only after all statements in the transaction have succeeded, ensuring the atomicity of the transaction, as well as ensuring the consistency of the physical and logical state of the data store. If any statement fails, all changes made during the transaction are rolled back. The following SQL statements match the desired behavior: mysql> START TRANSACTION; mysql> UPDATE account SET balance = balance 100 WHERE customer = 'Jane Doe' AND account = 'checking'; mysql> UPDATE account SET balance = balance + 100 WHERE customer = 'Jane Doe' AND account = 'savings'; mysql> COMMIT;

Affordances are the visual clues designed to demystify a complex application. For example, Windows uses brief descriptions to provide a little information about your computer s Internet settings, as shown in Figure 22-14.

The following code sample shows how you can place multiple SQL statements within an anonymous PL/SQL block:

Figure 22-14. A dialog with affordances Help and affordances represent a bit of a paradox. Nothing can clarify a confusing dialog box more than a couple of well-placed words or icons. On the other hand, users often ignore descriptions, error messages, or anything else that requires reading. They either try to figure out the task on their own or, in the case of an error, repeat the task a few times and then give up.

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