Re: Consecutive Inserts Freeze Execution of Psycopg3

Thanks Adrian -
I appreciate it; and I've been pouring through documentation to try and get
to this point.
I can't help but feel I'm doing it "wrong" but no website I can find
recently seems to have a "right" way of doing things that's reasonably kept
up.
It would be nice if "wrong" had a way of shooting me in the foot with
verbose errors or warnings.

-Mike

On Sun, Apr 23, 2023 at 7:15 PM Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com>
wrote:

> On 4/23/23 14:55, Michael P. McDonnell wrote:
> > That helped a ton, I don't understand why I've had to rewrite the crap
> > out of all of this to get it to work (dropping SqlAlchemy, upgrading
> > from psycopg2 to psycopg, etc...) but it's working now and I can work
> > around it. Thank you.
>
> Well:
>
> 1) SQLAlchemy is an ORM that tries to make all databases look the same.
>
> 2) psycopg2 != psycopg. For details see:
>
> https://www.psycopg.org/psycopg3/docs/basic/from_pg2.html
>
> 3) It would have been more of a surprise if you did not have to change
> anything.
>
> 4) And this
>
> with self.connection.cursor() as conn:
>
> was just plain wrong. You where trying to make a cursor be a connection
> and that is not going to work.
>
>
> >
> >
> > On Sun, Apr 23, 2023 at 4:25 PM Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com
> > <mailto:adrian(dot)klaver(at)aklaver(dot)com>> wrote:
> >
> > On 4/23/23 13:45, Michael P. McDonnell wrote:
> > > Python 3.10.6
> > > psycopg library 3.1.8
> > >
> > > Running consecutive inserts sourced in files.
> > > All inserts are of the same format:
> > >
> > > INSERT INTO _____ (field1, field2, field3)
> > > SELECT field1, field2, field3 FROM ____, Join ___, join ___ etc...
> > >
> > > The code I've written is this:
> > >
> > > for qi in range(qlen):
> > > query = queries[qi]
> > > qparams = params[qi]
> > > with self.connection.cursor() as conn:
> > > conn.execute(query, qparams)
> >
> > In above you are running the context manager(with) over the cursor
> not
> > the connection. This will not automatically commit the transaction.
> You
> > will need to either explicitly do connection.commit() or use the with
> > over the connection per:
> >
> > https://www.psycopg.org/psycopg3/docs/basic/transactions.html
> > <https://www.psycopg.org/psycopg3/docs/basic/transactions.html>
> >
> > >
> > > When I run the queries in dbeaver - the first query takes 120s
> (it's
> > > 1.9M rows), the second query takes 2s (7000 rows).
> > > When I run the queries in python - it freezes on the second query.
> > >
> > > Any guidance on how to attack this would be awesome as I have
> > re-written
> > > my code a dozen times and am just slinging mud to see what sticks.
> >
> > --
> > Adrian Klaver
> > adrian(dot)klaver(at)aklaver(dot)com <mailto:adrian(dot)klaver(at)aklaver(dot)com>
> >
>
> --
> Adrian Klaver
> adrian(dot)klaver(at)aklaver(dot)com
>
>