On Thu, Apr 1, 2021, at 10:06 AM, sumau wrote: > Hello > > Following advice from this article: > https://www.oddbird.net/2014/06/14/sqlalchemy-postgres-autocommit/ > > and because we run large, consecutive queries, we set our transaction > isolation level to 'autocommit' when connecting to our postgres DB. This > means we cannot create explicit transactions and use begin() and commit(): > https://www.oddbird.net/2014/06/14/sqlalchemy-postgres-autocommit/ > > This has not a problem so far because we can create another (temporary) > connection when we do want to have a roll-backable transaction. However since > postgres DB is set to autocommit by default, I was wondering whether setting > the transaction isolation level to 'autocommit' was needlessly complicated?
the Python DBAPI is transactional by default and the "autocommit" feature of many DBAPIs is not part of the specification: https://www.python.org/dev/peps/pep-0249/ . the psycopg2 driver, as well as all other DBAPI drivers, are not in autocommit by default. > > For example in the example explained here: the > https://docs.sqlalchemy.org/en/14/tutorial/dbapi_transactions.html#getting-a-connection > the query will still be committed, even if don't explicitly commit the > transaction or the transaction isolation level to 'autocommit'. respectfully, that is incorrect for the DBAPI drivers included in SQLAlchemy, provided you aren't using MySQL with MyISAM tables. try it out > > Regards > Soumaya > > -- > 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 view this discussion on the web visit > https://groups.google.com/d/msgid/sqlalchemy/5d474102-1212-4e8e-b26e-a78815ed5829n%40googlegroups.com > > <https://groups.google.com/d/msgid/sqlalchemy/5d474102-1212-4e8e-b26e-a78815ed5829n%40googlegroups.com?utm_medium=email&utm_source=footer>. -- 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 view this discussion on the web visit https://groups.google.com/d/msgid/sqlalchemy/4cbda2cc-09ef-4a5c-be20-3bc710898fe0%40www.fastmail.com.
