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 -- 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.
