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CHAPTER 3 A TOUR OF THE MYSQL SOURCE CODE
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#endif if (opt_log || opt_update_log || opt_slow_log || opt_bin_log) strmov(end, "-log"); // This may slow down system /* BEGIN CAB MODIFICATION */ /* Reason for Modification: */ /* This section adds my revision note to the MySQL version number. */ strmov(end, "-CAB Modifications"); /* END CAB MODIFICATION */ } Note also that I have included the modification comments I referred to earlier. This will help you determine which lines of code you have changed. This change also has the benefit that the new version number will be shown in other MySQL tools such as the MySQL Administrator. Figure 3-5 shows the results of running the MySQL Administrator against the code compiled with this change.
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Figure 3-5. Accessing the modified MySQL server using MySQL Administrator
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Caution Did I mention this wasn t an approved method If you are using MySQL to conduct your own
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experiments or you are modifying the source code for your own use, you can get away with doing what I have suggested. However, if you are using the code under source code control or you are creating modifications that will be added to the base source code at a later date, you should not implement this technique.
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Summary
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In this chapter, you have learned several methods to get the source code. Whether you choose to download a snapshot of the source tree, a copy of the GA release source code, or use the BitKeeper client software to gain access to the latest and greatest version, you can get and start using the source code. Now that is the beauty of open source!
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CHAPTER 3 A TOUR OF THE MYSQL SOURCE CODE
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Perhaps the most intriguing aspect of this chapter is your guided tour of the MySQL source code. I hope that by following a simple query all the way through the system and back, you gained a lot of ground on your quest to understanding the MySQL source code. I also hope that you haven t tossed the book down in frustration if you ve encountered issues with compiling the source code. Much of what makes a good open source developer is her ability to systematically diagnose and adapt her environment to the needs of the current project. Do not despair if you had issues come up. Solving issues is a natural part of the learning cycle. You also explored the major elements from the MySQL Coding Guidelines document and saw examples of some of the code formatting and documentation guidelines. While not complete, the coding guidelines I presented are enough to give you a feel for how MySQL AB wants you to write the source code for your modifications. If you follow these simple guidelines, you should not be asked to conform later. In the next two chapters, I will take you through two very important concepts of software development that are often overlooked. The next chapter will show you how to apply a testdriven development methodology to exploring and extending the MySQL system, and the chapter that follows will discuss debugging the MySQL source code.
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Test-Driven MySQL Development
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ystems integrators must overcome limitations of the systems they are integrating. Sometimes the system lacks certain functions or commands that are needed for the integration. MySQL AB has recognized this need and includes flexible options in the MySQL server that add new functions and commands. This chapter introduces a key element in generating high-quality extensions to the MySQL system. I ll discuss software testing and explain some common practices for testing large systems. I ll use specific examples to illustrate the accepted practices of testing the MySQL system.
Background
Some of you may be wondering why I would include a chapter about testing so early in the book. I did so because I wanted to tell you about the testing capabilities available so that you can plan your own modifications by first planning how to test them. This is the premise of testdriven development: to develop and implement the tests from the requirements, write the code, and then immediately execute the tests. This may sound a tad counterintuitive to someone not familiar with this concept; after all, how do you write tests for code that hasn t been written In the following sections, I ll clarify by providing some background information regarding this increasingly popular concept.
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