(mysql.info.gz) Adding functions

 
 25.2 Adding New Functions to MySQL
 ==================================
 
 There are two ways to add new functions to MySQL:
 
    * You can add the function through the user-defined function (UDF)
      interface.  User-defined functions are added and removed
      dynamically using the `CREATE FUNCTION' and `DROP FUNCTION'
      statements.   `CREATE FUNCTION' CREATE FUNCTION.
 
    * You can add the function as a native (built in) MySQL function.
      Native functions are compiled into the `mysqld' server and become
      available on a permanent basis.
 
 Each method has advantages and disadvantages:
 
    * If you write a user-defined function, you must install the object
      file in addition to the server itself.  If you compile your
      function into the server, you don't need to do that.
 
    * You can add UDFs to a binary MySQL distribution.  Native functions
      require you to modify a source distribution.
 
    * If you upgrade your MySQL distribution, you can continue to use
      your previously installed UDFs.  For native functions, you must
      repeat your modifications each time you upgrade.
 
 Whichever method you use to add new functions, they may be used just
 like native functions such as `ABS()' or `SOUNDEX()'.
(mysql.info.gz) Adding functions

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