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So, what would happen if we executed these statements against a MySQL database server running in the default autocommit mode Well, fortunately, the START TRANSACTION command actually tells MySQL to disable its autocommit mode and view the statements within the START TRANSACTION and COMMIT commands as a single unit of work. However, if you prefer, you can explicitly tell MySQL not to use autocommit behavior by issuing the following command: mysql> SET AUTOCOMMIT = 0; An important point is that if you issue a START TRANSACTION and then a COMMIT, after the COMMIT is received, the database server reverts back to whatever autocommit mode it was in before the START TRANSACTION command was received. This means that if autocommit mode is enabled, the following code will issue three flushes to disk, since the default behavior of wrapping each modification statement in its own transaction will occur after the COMMIT is received. 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; mysql> UPDATE account SET balance = balance 100 WHERE customer = 'Mark Smith' AND account = 'checking'; mysql> UPDATE account SET balance = balance + 100 WHERE customer = 'Mark Smith' AND account = 'savings'; So, it is important to keep in mind whether or not MySQL is operating in autocommit mode.

Given this problem, what is the role of Help in an application It s hard to believe that Help is useless, as you can routinely see innovative games and Web sites that have no problem guiding users through new and unusual interfaces with a few carefully integrated explanations. Unfortunately, the customary current stand-alone Help is designed to provide reference information. It s very poor at the task-based explanations that most beginning users require in fact, it s really little more than a limited electronic book.

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UPDATE Products SET Price=100 WHERE ID='E1'; UPDATE Products SET Price=200 WHERE ID='K1'; DELETE FROM Products WHERE ID='A1'; END; The entire preceding code snippet can simply be passed in as the CommandText property of an OracleCommand object. Let s take a look at the full code in detail. You will compare the performance of making one single database round trip (via a batched query) against the performance of making a separate database round trip for each SQL statement. Write the code shown in Listing 12-3. Listing 12-3. Updating 10,000 Records As Separate and Batched Commands

There are both implicit and explicit transaction processing commands. What we mean by explicit is that you actually send the specified command to the database server during a connection session. Implicit commands are commands that are executed by the database server without you actually sending the command during the user connection. MySQL automatically issues an implicit COMMIT statement when you disconnect from the session or issue any of the following commands during the user session: ALTER TABLE BEGIN CREATE INDEX DROP DATABASE DROP TABLE RENAME TABLE TRUNCATE LOCK TABLES UNLOCK TABLES

Agents are the animated characters that appear in applications to guide users through a task The most infamous example of an agent is the (now defunct) Clippy character included with Microsoft Office Most developers don t consider agents for their applications because of several factors: Agents require first-rate design work An ugly agent is worse than no agent at all Agents require tedious programming Every action or tip the agent gives must be individually triggered by the application code If not handled properly, this can lead to Help code that is tangled up with the application s core functionality Agents are silly, and appeal more for novelty than for any actual assistance they provide These are legitimate concerns However, in a consumer application, an agent can act as an appealing and distinctive feature that attracts the user s attention Agents also perform the remarkable trick of turning tedium into fun.

private void btnBatchSQL(object sender, EventArgs e)

Quite simply, users often enjoy using programs with agents (Of course, it helps to know your user Relatively inexperienced users may enjoy agents while power users might find they slow them down or interfere with their workflow) Creating a program with agent support is not as difficult as most developers believe, because Microsoft provides some remarkable tools, and a set of four standard characters that can be freely distributed with your applications To download the agent libraries, refer to http:// msdnmicrosoftcom/library/en-us/msagent/userinterface_3y2aasp The Microsoft Agent Control is available only as a COM component, but it can be easily consumed in a NET program by creating a runtime-callable wrapper (RCW), a task Visual Studio carries out automatically when you add a reference to a COM component in your project To use the Microsoft Agent control, right-click the Toolbox and select Choose Items.

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