On Tue, Aug 28, 2018 at 5:53 PM Simon King <si...@simonking.org.uk> wrote: > > On Tue, Aug 28, 2018 at 4:32 PM 'Brian DeRocher' via sqlalchemy > <sqlalchemy@googlegroups.com> wrote: > > > > Hey all, > > > > I'm writing some automated tests for some legacy python code using a > > psycopg2 connection. I'd like to check data in the database by using > > SQLAlchemy. I rollback the database transaction after each test in > > tearDown(). > > > > The problem is my SQLAlchemy connection doesn't see the database updates. > > At first I thought they weren't using the same connection, but they are. > > I'm using create_engine(..., creator=get_conn). > > > > The problem appears to be that DefaultDialect is rolling back the > > transaction. See sqlalchemy/engine/default.py line 167. I had to review > > PG logs to spot this as it's not logged. > > > > self.do_rollback(connection.connection) > > > > Is this line really needed? What would it be rolling back? Can it be > > avoided? When I disable this line of code, the transaction continues and > > sqlalchemy can see the updates from psyopg2. > > > > I've attached a demo file. > > > > I haven't tried to run your code, but the usual way to connect a > session to an existing connection is to bind the session directly to > the connection: > > http://docs.sqlalchemy.org/en/latest/orm/session_transaction.html#joining-a-session-into-an-external-transaction-such-as-for-test-suites > > Would that work for your situation? > > Hope that helps, > > Simon
Sorry, I realised just after I pressed Send that you have a DBAPI-level connection rather than an SQLAlchemy connection, so my suggestion doesn't really help... For what it's worth, the "do_rollback" was apparently added here: https://bitbucket.org/zzzeek/sqlalchemy/commits/39fd3442e306f9c2981c347ab2487921f3948a61#chg-lib/sqlalchemy/engine/default.py Simon -- SQLAlchemy - The Python SQL Toolkit and Object Relational Mapper http://www.sqlalchemy.org/ To post example code, please provide an MCVE: Minimal, Complete, and Verifiable Example. See http://stackoverflow.com/help/mcve for a full description. --- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at https://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.
