Hi Frank,

have a look at ROE on SqueakMap. This is a hyper cool package allowing
to deal with relations in the postgresql database just as it was a
smalltalk collection. The selections, projections, joins, ... you do
using Smalltalk code will be automatically converted to SQL queries
and only the data that is really necessary will be pulled into the
image. No string concatenation anywhere. We are successfully using
this framework in a production environment.

Cheers,
Lukas

-- 
Lukas Renggli
http://www.lukas-renggli.ch