PHP Database Abstraction Layer

I once read a great article in the first or second issue of http://www.phparch.com/ on database abstraction layers. At which point I used the tutorial as a starting point for creating a very similar structure I named dbWave. There are only minor differences and a postgresql driver is now included for the most common pg_* functions. I was just wondering if anyone has developed a database abstraction layer that allows you to separate your SQL queries from your application logic like dbWave does? I'm looking for a more advanced way of doing this? Attached is dbWave for anyone to look at/use. To run it you need to use the following tags in your file: // DBWave include files include( "[attached_filename].php" ); To instantiate the dbWave object you use the following code in a file name connect.php <?php /* This file instantiates dbWave using our chosen API */ /* It is automatically generated by the database setup program */ // Instantiate dbWave using the MySQL API $dbWave = new Mysql(); // Connect to the database $dbWave->connect( 'yourhost', 'yourport', 'yourdbname', 'yourdbuser', 'yourdbpass' ); ?> Thanks, Luke Woollard Programmer / Analyst TABORVISION.com