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A recommended way to analyze the source code is to use a tool like Doxygen (http://www.stack.nl/ ~dimitri/doxygen/index.html), which enables you to get the code structure from a source distribution. This tool can be extremely useful for navigating through functions in a large source distribution like MySQL, where a single execution can call hundreds of class members and functions. The documented output enables you to see where the classes or structs are defined and where they are implemented. Doxygen provides the ability to configure the output of the documentation produced by the program, and it even allows for UML inheritance and collaboration diagrams to be produced. It can show the class hierarchies in the source code and provide links to where functions are defined and implemented. On Unix machines, download the source code from the Doxygen web site, and then follow the manual instructions for installation (also available online at the web site). To produce graphical output, you ll want to first download and install the Graph visualization toolkit from http://www.graphviz.org/. After installing Doxygen, you can use the following command to create a default configuration file for Doxygen to process: # doxygen -g -s /path/to/newconfig.file The option /path/to/newconfig.file should be the directory in which you want to eventually produce your Doxygen documentation. After Doxygen has created the configuration file for you, simply open the configuration file in your favorite editor and edit the sections you need. Usually, you will need to modify only the OUTPUT_DIRECTORY, INPUT, and PROJECT_NAME settings. Once you ve edited the configuration file, simply execute the following: # doxygen </path/to/config-file> For your convenience, a version of the MySQL 5.0.2 Doxygen output is available at http://www.jpipes.com/mysqldox/.

The next step is to identify the virtual property that will be assigned to all extended controls. You do this by adding a ProvideProperty attribute just before your class declaration. The ProvideProperty attribute identifies the property name and the type of class that is being extended. [ProvideProperty("HelpText", typeof(ToolStripItem))] public class StatusStripHelpLabel : ToolStripStatusLabel, IExtenderProvider { ... } Once you ve specified a property in this fashion, you need to provide corresponding GetXxx() and SetXxx() methods that perform the actual work when the property is changed. These members are preceded with Get or Set and use the same name you identified in the ProvideProperty attribute. These methods must be public. public void SetHelpText(object extendee, string value) { ... } public string GetHelpText(object extendee) { ... } Remember, neither of these methods is explicitly defined in the IExtenderProvider interface. When the Windows Forms infrastructure hooks up an extender provider, it uses reflection. Interestingly, it does so in a way that works even if you change the parameter types. That means you re free to use this strongly typed code and avoid an extra cast:

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Figure 2-18. End of ODAC.NET installation You re almost there! The Oracle providers for ASP.NET, as you learned in the previous chapter, provides a bunch of ASP.NET providers to support common web application functionality. The scripts for these ASP.NET providers are placed in the folder shown at the End of Installation screen. To run these scripts, you need to use the SQL*Plus tool bundled with the Oracle installation. You can launch the SQL*Plus tool from the Windows start menu: Start All Programs Oracle OraDb11g_home1 Application Development SQLPlus. You will immediately be prompted for a username and password. You can use the same SYSTEM username and password you created earlier during the Oracle database installation to log in. After you have successfully logged in, you will be presented with the SQL> prompt. The command to run a .sql file is an alias character (@) followed by the full path of the SQL file. You can install each ASP.NET provider individually by executing the individual .sql script files in the same folder, or all in one go using the InstallAllOracleASPNetProviders.sql file. The screenshot in Figure 2-19 shows how you can execute this .sql file in SQL*Plus.

public void SetHelpText(ToolStripItem extendee, string value) { ... } public string GetHelpText(ToolStripItem extendee) { ... }

The internal system documentation is available to you if you download the source code of MySQL. It is in the Docs directory of the source tree, available in the internals.texi TEXI document. The TEXI documentation covers the following topics in detail: Coding guidelines The optimizer (highly recommended reading) Important algorithms and structures Charsets and related issues How MySQL performs different SELECT operations (very useful information) How MySQL transforms queries Communication protocol Replication

Tip In this example, the extender provider provides a single property. However, there s no reason why you

Figure 2-19. Running the InstallAllOracleASPNetProviders.sql script using SQL*Plus After executing this command a stream of text output will be displayed. A message showing PL/SQL procedure successfully completed will be displayed at the end of this output if the scripts executed successfully (as shown in Figure 2-20).

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