Transactions

Hi,

I just checked the development version of opencart (svn rev9). I didn't see that
you used transactions, or did I miss something ?

Although MySql is the most used DB by providers, wouldn't it be good to do some
abstraction in the database class to easily allow the switch to postgres ? I think the
new comming version 0.7 will be perfect for this, due the "radical" changes made there
in comparison to the actual one.

Regards