connection() dispatch

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Regarding this error:

Can't locate object method "connection" via package "Unicorn::DBI" at ...

This is my first CDBI script and is intended as a proof-of-concept sanity check. I borrowed the example code from the intro of the Class::DBI man page and ran it as:

package Unicorn::DBI;
use base 'Class::DBI';

Unicorn::DBI->connection(db_name, user, pw);

<snip>

My guess is that I've failed to properly specify a driver for MySQL. I'm confused as to how DBI.pm and the driver are supposed to link with CDBI. Just 'using' DBD::mysql made no difference. Must I set up the connection via DBI and DBD first? And if so, how is connection() dispatched?

Thanks for your help

Bogart Salzberg
InkFist.Com