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rawing programs exist in two basic flavors. The first type is painting programs, like Microsoft Paint, which allow users to create bitmaps with static content. In these programs, once the user draws a shape or types some text onto the drawing area, it can t be modified or rearranged. But in more-sophisticated vector-based drawing programs (everything from Adobe Illustrator to Microsoft Visio), the user s drawing is actually a collection of objects. The user can click and change any object at any time or remove it entirely. It s relatively easy to create a bitmap-based drawing program once you learn GDI+. However, a vector-based drawing or diagramming program can be a little more complex, because you need to keep track of every object and its location individually. When the user clicks on the drawing surface, you may need to use some fairly intricate logic to find out which object the user is trying to select, and handle the overlapping painting. You might use two approaches to tackle this problem: Use child controls for each drawing element. This is the simplest approach to solve the problem, but it isn t flexible enough for a professional drawing application. Draw and track each element manually. This approach gives you the greatest flexibility and power, but it will force you to step up with a fair bit of extra code. In this chapter, you ll learn how create an application that lets you draw, configure, and move shapes around a form surface using both techniques. This application is a great starting point if you need to build some sort of dynamic drawing or diagramming tool, and it s a good example of owner-drawn controls and GDI+ drawing.

The release of ODP.NET version 11 provided two additional performance enhancements that were transparent to the developer (requiring no code change): Improved parameter context caching Efficient retrieval of small-sized LOB files Parameter context caching improved performance for applications that executed the same SQL statement repeatedly. Retrieval of small-sized LOB files also performed better due to fewer round-trips required to the server with this release.

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The basic application (shown in Figure 24-1) allows the user to create rectangles, ellipses, or triangles of any color, and then resize them or drag them around the form to a new location. Rather than coding all the logic to manage the hit testing, selection, and layering, you can make use of a convenient shortcut by turning each shape into a custom control. Because each control has its own built-in smarts for handling user interaction like mouse clicks and key presses, this approach simplifies your life considerably.

mysql> SET GLOBAL TRANSACTION ISOLATION LEVEL READ COMMITTED; Query OK, 0 rows affected (0.00 sec) mysql> START TRANSACTION; Query OK, 0 rows affected (0.00 sec) Now, in a new Connection 2, start another connection and issue the following statement: SELECT MAX(my_number) FROM numbers You should see the following: mysql> START TRANSACTION; Query OK, 0 rows affected (0.00 sec) mysql> SELECT MAX(my_number) FROM numbers; +----------------+ | MAX(my_number) | +----------------+ | 6 | +----------------+ 1 row in set (0.00 sec) Now, switch back to Connection 1 and insert a new record into the numbers table, and then COMMIT that transaction (again, in Connection 1): mysql> INSERT INTO numbers VALUES (7); Query OK, 1 row affected (0.03 sec) mysql> COMMIT; Query OK, 0 rows affected (0.06 sec) Next, switch to Connection 2 and run the same SELECT statement again: SELECT MAX(my_number) FROM numbers mysql> SELECT MAX(my_number) FROM numbers; +----------------+ | MAX(my_number) | +----------------+ | 7 | +----------------+ 1 row in set (0.00 sec) As the READ COMMITTED name indicates, our statement has indeed returned the newly inserted record from the transaction committed in Connection 1, even though we have not yet committed our transaction in Connection 2. Now, let s see how the same experiment works when the isolation level is set to REPEATABLE READ. First, let s commit our second transaction in Connection 2, reset our numbers table to its original state, and then exit Connection 2 s session: mysql> COMMIT; Query OK, 0 rows affected (0.00 sec) mysql> DELETE FROM numbers WHERE my_number = 7; Query OK, 1 row affected (0.11 sec) mysql> exit; Bye

Figure 24-1. A vector-based drawing application The basic concept in this application is to let the shapes draw themselves. Essentially, each shape is an owner-drawn control that paints its surface. The support for dragging, resizing, and changing shape colors is built into the form code, but it s not terribly difficult to implement. Really, all the form needs to do is react to the user s mouse actions, and set properties like Location and Size accordingly. It s easy to react to an event when a specific shape is clicked, because the shape controls inherit all the basic mouse notification events from the Control class. Using this application, you could easily add more shape types and enhance the drawing functionality with additional features. You ll see some of these enhancements in the revised, non control-based version of this application.

The xcopy command is a handy command line tool that ships with Microsoft Windows. It allows users to copy entire folders and subfolders (recursively) from one location to another. ODP.NET supports using this tool to deploy ODP.NET to a large number of computers during production.

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