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You can also turn debugging on using the configuration file. Simply place the string from the previous example into the my.cnf (my.ini) file that your source code specifies at startup (more on that in a moment). What if you want to use the DBUG package from your embedded application but don t want to include the DBUG package in your own code Are you simply out of luck The embedded
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CHAPTER 6 EMBEDDED MYSQL
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library doesn t expose the DBUG methods, but it could! The following paragraphs explain the procedure to modify the embedded server to include a simple DBUG method. I m using a simple example as I do not want to throw you into the deep end just yet. The first thing you need to do is to make a backup of the original source code. If you downloaded a tarred or zipped file, then you re fine. If you do find yourself struggling with getting the server to compile after you ve added some code, returning to the original copy can have profound effects on your stress level (and sanity). This is especially true if you ve removed your changes and it still doesn t compile! Adding a new method is really easy. Edit the mysql.h file in the /include directory and add the definition. I chose to create a method that exposes the DBUG_PRINT function. I named it simply mysql_dbug_print(). Listing 6-2 shows the function definition for this method. Note that the function accepts a single character pointer. I use this to pass in a string I ve defined in my embedded application. This allows me to write a string to the trace file as sort of a marker for where my embedded application synchronizes with the trace from the embedded server. Listing 6-2. Modifications to mysql.h /* BEGIN CAB MODIFICATION */ /* Reason for Modification: */ /* Adds a method to permit embedded applications to call DBUG_PRINT */ void STDCALL mysql_dbug_print(const char *a); /* END CAB MODIFICATION */ To create the function, edit the /libmysqld/libmysqld.c file (/libmysqld/libmysqld.cc in Windows) and add the function to the rest of the source code. The location doesn t matter, just as long as it is in the main body of the source code somewhere. I chose to locate it near the other exposed library functions (near line number 91). Listing 6-3 shows the code for this method. Notice that the code simply echoes the string to the DBUG_PRINT method. Notice I also add a string to the end of the string passed. This helps me locate all of the trace lines that came from my application regardless of what I pass in to be printed. Listing 6-3. Modifications to libmysqld.c /* BEGIN CAB MODIFICATION */ /* Reason for Modification: */ /* Adds a method to permit embedded applications to call DBUG_PRINT */ void STDCALL mysql_dbug_print(const char *a) { DBUG_PRINT(a, (" -- Embedded application.")); } /* END CAB MODIFICATION */ To add a method to the embedded library in Windows you will also have to modify the libmysqld.def file to include the new method. Listing 6-4 shows an abbreviated listing as an example. Here I ve added the mysql_dbug_print() statement to the file. Note that the file is maintained in alphabetical order.
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CHAPTER 6 EMBEDDED MYSQL
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Listing 6-4. Modifications to libmysqld.def LIBRARY LIBMYSQLD DESCRIPTION 'MySQL 5.0 Embedded Server Library' VERSION 5.0 EXPORTS _dig_vec_upper _dig_vec_lower ... mysql_dbug_print mysql_debug mysql_dump_debug_info mysql_eof ... That s it! Now just recompile the embedded server and your new method can be used in your application. I ve done this to my installation of the embedded server. The examples that follow use this method to write a string to the trace file. This helps me greatly in finding the synchronization points in the trace file with my source code.
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Tip In the previous listings I use the same commenting strategy that I presented in 3. This will
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help you identify any differences with the source code whenever you need to migrate to a newer version.
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