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Generating the Lexical Hash on Linux
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Linux users, this is your chance to smile. The build scripts for the MySQL server include the compilation of the gen_lex_hash utility. For some distributions of the MySQL source code (5.1 and later), the utility is located in the /sql directory and is compiled with the mysqld server. Other distributions (some Windows distributions) place the utility in a directory named gen_lex_hash and have their own makefile. Generate the lexical hash by running the gen_lex_hash utility as shown here: gen_lex_hash > lex_hash.h This will generate a new lex_hash.h file to use when compiling the server that will recognize the new symbols added to the lex.h file. However, you really don t need to do this step because the makefile included with the Linux source code distribution performs this step for you. The only reason you might want to run the command is if you want to ensure there are no errors.
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Compiling and Testing the New Native Function
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Recompile your server and reload it. If you encounter errors during compile, go back and check the statements you entered for errors. Once the errors are corrected and you have a new executable, stop your server and copy the new executable to the location of your MySQL installation and restart the server. You can now execute the native function Gregorian as shown in Listings 8-15 and 8-16. To test the Gregorian function for correctness, you can run the julian() command first and use that value as input to the gregorian() function. Listing 8-15. Running the julian() Function mysql> select julian(7,4,2006); +------------------+ | julian(7,4,2006) | +------------------+ | 1852006 | +------------------+ 1 row in set (0.00 sec)
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CHAPTER 8 ADDING FUNCTIONS AND COMMANDS TO MYSQL
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Listing 8-16. Running the gregorian() Function mysql> select gregorian(1852006); +--------------------+ | gregorian(1852006) | +--------------------+ | 7/4/2006 | +--------------------+ 1 row in set (2.44 sec) Well, that s about it for adding native functions. Now that you have had an introduction to creating native functions, you can further plan your integration with MySQL to include customizations to the server source code.
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Adding SQL Commands
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If you find that the native SQL commands do not meet your needs and you cannot solve your problems with user-defined functions, you may have to add a new SQL command to the server. This section shows you how to add your own SQL commands to the server. Adding new SQL commands is considered by many to be the most difficult extension of all to the MySQL server source code. As you will see, the process isn t as complicated as it is tedious. To add new SQL commands, you must modify the parser (in sql\sql_yacc.yy) and add the commands to the SQL command processing code (in sql\sql_parse.cc). When a client issues a query, a new thread is created and the SQL statement is forwarded to the parser for syntactic validation (or rejection due to errors). The MySQL parser is implemented using a large Lex-YACC script that is compiled with Bison. The parser constructs a query structure used to represent the query statement (SQL) in memory as a data structure that can be used to execute the query. Thus, to add a new command to the parser, you will need a copy of GNU Bison. You can download Bison from the GNU web site2 and install it.
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WHAT IS LEX AND YACC AND WHO S BISON
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Lex stands for lexical analyzer generator and is used as a parser to identify tokens and literals as well as syntax of a language. YACC stands for yet another compiler compiler and is used to identify and act on the semantic definitions of the language. The use of these tools together with Bison (a YACC-compatible parser generator that generates C source code from the Lex/YACC code) provides a rich mechanism of creating subsystems that can parse and process language commands. Indeed, that is exactly how MySQL uses these technologies.
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2. Linux/Unix users can download it from the GNU web site (www.gnu.org/software/bison). Windows users can download a Win32 version from http://gnuwin32.sourceforge.net/packages/bison.htm.
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