There has been some talk about this behaviour on the cdbi-talk mailinglist recently. I don't know if the suggestions there are helpful for your case. If no-one here can give you a work-around, try asking on the cdbi-talk list. The people there are quite helpful.

"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re: Using Class::DBI with Sybase and mixed case columns by Joost
in thread Using Class::DBI with Sybase and mixed case columns by rinceWind

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