Constraining a Class

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I have a table 'Company' in my database. This table holds all manner of 
companies: Customers, Potential Customers, Previous Customers, Suppliers 
etc. There's an enum field that tells me which sort of company each row 
represents.

I'd like to be able to create My::Data::Customer, 
My::Data::PotentialCustomer etc., representing each of these types of 
record in the table.

Is this possible in Class::DBI or do I always have to add that to my 
queries?

Cheers!
Rick Measham