Psycopg2 is absolutely necessary, but not enough. Psycopg2 provides a low-level python database interface.
There are several ways to provide database interconnectivity, and it depends on what exactly you want to do.
No matter which solution you choose, you want to get the right eggs from PYPI: http://pypi.python.org/
Script, Zope , Zope, SQLAlchemyDA: http://pypi.python.org/pypi/Products.SQLAlchemyDA/0.5.1. SQLAlchemyDA , db-api (, psycopg2), PostGreSQL, Oracle, MySQL .
, SQL - , pas.plugins.sqlalchemy ore.contentmirror Plone - z3c.saconfig: http://pypi.python.org/pypi/z3c.saconfig/0.12
, - , - SQLAlchemyDA z3c.saconfig.