Question

All,

I am writing error messages to a log file and it’s becoming pretty large because it errors on unique constraints in the DB. That is fine and it’s actually want it to do so my question is, how can I avoid writing the duplicate key errors to the log file every time they happen?

        except Exception as err:
                logger.error('FunctionName: %s',  err)

Thanks,
Adam

Answer 1

Psycopg passes the PostgreSQL error code along with the exception in the attribute pgcode: you can verify that the error is actually related to a unique violation and avoid logging them. For example:

try:
    cursor.execute("...")
except psycopg2.IntegrityError as err:
    if err.pgcode != '23505':
        logger.error('FunctionName: %s',  err)
except Exception as err:
    logger.error('FunctionName: %s',  err)