Joomla--DAO is a project mainly written in PHP, it's free.
Database Acess Object - library
Install as a plugin.
See my post about it: http://sum-e.com/Page/View/2/Joomla%20DAO
Or on Joomla forums: http://forum.joomla.org/viewtopic.php?f=178&t=470282
You can get latest version from: http://sum-e.com/resources/files/joomla-dao-plugin.zip
Collaborate code http://github.com/fornve/Joomla--DAO
Have a fun!