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CHAPTER 3 A TOUR OF THE MYSQL SOURCE CODE
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The alignment of the curly braces is also inconsistent in some parts of the source code. The MySQL coding guidelines state that the curly braces should align with the control code above it as I have shown in all of our examples. However, if you need to indent another level you should indent using the same column alignment as the code within the curly braces (two spaces). It is also not necessary to use curly braces if you re executing a single line of code in the code block. An oddity of sorts in the curly braces area is the switch statement. A switch statement should be written to align the open curly brace after the switch condition and align the closing curly brace with the switch keyword. The case statements should be aligned in the same column as the switch keyword. Listing 3-23 illustrates this guideline. Listing 3-23. Switch Statement Example switch (some_var) { case 1: do_something_here(); do_something_else(); break; case 2: do_it_again(); break; }
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Note The last break in the previous code is not needed. I usually include it in my code for the sake
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of completeness.
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Another useful method of examining source code is to use an automated documentation generator that reads the source code and generates function- and class-based lists of methods. These programs list the structures used and provide clues as to how and where they are used in the source code. This is important for investigating MySQL because of the many critical structures that the source code relies on to operate and manipulate data. One such program is called Doxygen. The nice thing about Doxygen is that it too is open source and governed by the GPL. When you invoke Doxygen, it reads the source code and produces a highly readable set of HTML files that pull the comments from the source code preceding the function and lists the function primitives. Doxygen can read programming languages such as C, C++, and Java, among several others. Doxygen can be a useful tool for investigating a complex system such as MySQL especially when you consider that the base library functions are called from hundreds of locations throughout the code.
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CHAPTER 3 A TOUR OF THE MYSQL SOURCE CODE
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Doxygen is available for both UNIX and Windows platforms. To use the program on Linux, download the source code from the Doxygen web site at www.stack.nl/~dimitri/doxygen. Once you have downloaded the installation, follow the installation instructions (also on the web site). Doxygen uses configuration files to generate the look and feel of the output as well as what gets included in the input. To generate a default configuration file, issue the following command: doxygen -g -s /path_to_new_file/doxygen_config_filename The path specified should be the path you want to store the documentation in. Once you have a default configuration file, you can edit the file and change the parameters to meet your specific needs. See the Doxygen documentation for more information on the options and their parameters. You would typically specify the folders to process, the project name, and other project-related settings. Once you have set the configurations you want, you can generate documentation for MySQL by issuing this command: doxygen </path_to_new_file/Doxygen_config_filename>
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Caution Depending on your settings, Doxygen could run for a long time. Avoid using advanced graphing
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commands if you want Doxygen to generate documentation in a reasonable time period.
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The latest version of Doxygen can be run from Windows using a supplied GUI. The GUI allows you to use create the configuration file using a wizard that steps you through the process and creates a basic configuration file, an expert mode that allows you to set your own parameters, and the ability to load a config file. I found the output generated by using the wizard interface sufficient for casual to in-depth viewing. I recommend spending some time running Doxygen and examining the output files prior to diving into the source code. It will save you tons of lookup time. The structures alone are worth tacking up on the wall next to your monitor or pasting into your engineering logbook. A sample of the type of documentation Doxygen can generate is shown in Figure 3-3.
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