I have the same problem with my current shopping cart. It only supports mysql. I prefer postgres which Drupal supports. Shouldn't a module developed for Drupal support the databases that Drupal supports? There are many people who would like to use ubercart with postgresql. Not all of us use mysql or wish to use it. It would not hurt to consider getting ubercart to work with all databases Drupal supports and not just mysql. I realize this might not be as easy as it sounds but I am sure there are community members who would assist. I will do my best to try to figure out how to fix it and get any patches to you guys but I am not an expert in this regard so I am unsure of how successful I will be.

Thank you for all your time and efforts regarding this matter.