handle duplicate function names

Migrated issue

Reported by: hass

Often or nearly every time i'm using api.d.o i get a search result that contains code based on pgsql or links to code with pgsql. This is not what i need in 99% of time... i'd like to take a look at the mysql code only or better "switch able", while me knowledge on pgsql specific functions is not very high, but i'd like to understand how it is working. So the only chance i have today - i need to open the drupal source code on my box and search there for the things i need to get the mysql code.

The new very tabs are really cool feature, but please allow db-engine selection and save this info in my session.