[SQLObject] DB-API driver imports

[Matt G. <ma...@po...>]

Hi,

Is there a good reason why DBConnection.py tries to load all supported 
modules at the top of the module rather than where they are actually 
required? i.e. why is psycopg imported for the whole module rather than 
just  for PostgresConnection? It should be relatively easy to refactor 
the code so that the individual Connection classes load the DB-API 
module as needed.

A change like this would certainly improve load time for the module (not 
really all that important) but I think it will also make it easier for 
the Connection classes to support multiple dbapi DB-API drivers, i.e. 
psycopg, pyPgSQL etc.

Would you accept a patch for this?

- Matt

-- 
Matt Goodall, Pollenation Internet Ltd
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