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MySQL, through InnoDB s transaction processing system, provides you the ability to specify certain types of locks on a resource during a user session. Because it is much easier to see how these concepts interrelate when you work through some examples, that s what you ll do in this section. These examples will give you an idea of the differences between the lock types and how concurrently executing transactions can be affected by a variety of commands. We ll use the following table during this exercise: mysql> CREATE TABLE numbers (my_number INT NOT NULL PRIMARY KEY) ENGINE=InnoDB; We recommend that you follow along as we walk through these examples. Go ahead and open a connection and execute this CREATE TABLE statement in your test database.

Figure 15-31. Creating a new data source for the GridView control After you have done this, the screen shown in Figure 15-32 will appear. You will be able to choose a data source type. Select the Database icon, and specify an ID for the data source. You can use any name you wish.

Note To see some more examples of controls with images, check out the Visual Basic Power Pack, which has its own image button control (http://msdn.microsoft.com/vbasic/default.aspx pull=/ library/en-us/dv_vstechart/html/vbpowerpack.asp) and the RegionMaster controls http:// windowsforms.net/articles/usingregionmastercontrols.aspx), which use a timer to make a moused-over button bounce repeatedly.

Note In order for these examples to work, you must be running a version of MySQL with InnoDB compiled

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Currently, the PopImageButton (like all Control-derived classes) doesn t support transparency. If you re using ordinary forms, you won t notice the problem. That s because the default implementation on Control.OnPaintBackground() fills the background color of the form behind your custom control. However, if you place your control on a form that uses a background image, and size your control so that its bounds are larger than its content, you ll see the incorrect background (see Figure 23-10).

Figure 15-32. Creating the Oracle data source After you click the OK button, you will see the window shown in Figure 15-33. This window allows you to pick the database object to use as a data source. Let s try to display the list of products from the Products table. You probably don t want to display all the columns, so check only the first four columns. Take note that you can also define the WHERE and ORDER BY clauses of the SQL statement using the buttons on the right.

into the binary. You can use SHOW VARIABLES LIKE 'have_innodb' to check if a particular MySQL instance has the InnoDB engine installed. The possible values are NO, YES, and DISABLED. If the DISABLED option shows, you can modify the my.cnf file to remove the skip-innodb option in order to enable it. If the NO value shows, you must install a version of MySQL that has the InnoDB storage engine compiled into it. See 14 for more information MySQL installation and configuration.

Figure 23-10. A nontransparent background This is an unnecessary limitation. In fact, it s useful to have the form background show through behind the text if you want to combine your button with the skinned form techniques shown earlier. Fortunately, it s not hard to make a transparent control. The key step is to use the Control.SetStyle() method to specifically indicate that your control supports a BackgroundColor value of Color.Transparent. Without this step, you ll receive an exception if you attempt to set a transparent background color. In this example, the support for transparency is implemented in the AnimatedButtonBase class, from which RolloverButton derives:

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