What problem are you trying to solve by inheriting from DBI?
I would (if at all) aggregate a DBI object (rep. a database handle, as returned from DBI::connect) into my object. DBI itself provides very little in the way of methods itself, mainly the ->connect method. Most methods (like ->prepare and ->fetch* live in the database drivers (DBD::), and you can't easily inherit them (nor does that make sense to me).
If you really want a simple way to keep your database handle, look at Class::DBI. A more complex way is DBIx::Class, but there are many other modules that live in the DBIx namespace that provide enhancements or different APIs to DBI.
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