Hello,
So, short version: if I need a raw DBAPI connection and I have a
SQLAlchemy Session, what's the correct way to manage that raw connection
if I get it using session.connection().connection?
Versions:
Postgres 9.2
SQLAlchemy 0.8.2
Background:
I want to create a DataFrame using pandas.io.sql, but this requires a
raw DBAPI connection while the rest of my app uses SQLAlchemy sessions.
I bashed this in ipython notebook and ended up using
session.connection().connection to get the raw connection.
Now, I'm abstracting some of my notebook experiments into library
functions, and I found that unit testing a function that uses
session.connection().connection causes a bunch of my other tests to fail
even though all of my tests do a session.rollback() as part of the teardown.
What's the right way to get a raw connection? If it's
session.connection().connection, what book-keeping do I need to do to
stop stuff done in that connection not being rolled back by
session.rollback()?
Side question: if session.connection() creates a new connection, how is
stuff done in that connection not being isolate from stuff done in the
session?
cheers,
Chris
--
Simplistix - Content Management, Batch Processing & Python Consulting
- http://www.simplistix.co.uk
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