Best practices for SQL error handling?

[Buehl, Reiner (C&I EMEA ISG)]

Hi all,

are there any best practices for generic SQL error handling like how
to test if a SELECT returned any values at all? I have noticed that
different DBD drivers seem to produce different return values on 
selects - DBD-Oracle returns 0E0 if successful, DBD-CSV returns 0E0
if no row selected and the number of rows selected otherwise.

Is there a good recommendation on how to handle this if I need to 
use the same code with different DBD drivers?

Best regards,
Reiner.