Add support for SQLAlchemy 2.0, continued

[mhauru]

Continued from #249, see discussion there.

[coveralls]

coverage: 97.655% (+0.2%) from 97.436% when pulling 7352912 on mhauru:sqlalchemy2 into 6ecfbc4 on agronholm:master.

[agronholm]

Thanks, I'll check this out later today.

[agronholm]

I think the code is good enough for merging. I'll do some tinkering on it later.
Aside from the suggestions I've added, I will still need an added changelog entry (remember to give credit to yourself and the author of the original PR).

[mhauru]

Tests fail on 3.12, but I made the other changes. Please edit the changelog entry to be to your liking.

[agronholm]

Thanks a lot!

[mhauru]

No problem, @rbuffat did all the actual work here. Do you plan to release this to pypi or do you want further changes before that?

[agronholm]

I think I will first tinker with the test suite and then release to PyPI later this week.

[agronholm]

What are you getting exactly?

[mhauru]

Hi @agronholm, sorry to keep pestering you, I know you have competing priorities. Is there anything I can do to help in getting the SQLAlchemy 2 support into a PyPi release? It would unblock a series of dependency upgrades for our project.

[agronholm]

I wanted to fix a couple more bugs first, but looks like I didn't have the time. I've released v3.0.0rc3 now to unblock your upgrades.

[pang-thebasement]

Hello:
Thanks a lot to all contributors. I wanted to test sqlacodegen on our database, but when I try to pip install tag 3.0.0rc3

git checkout 3.0.0rc3
python3 -m pip install -U .

I get an error like this:

    Defaulting to user installation because normal site-packages is not writeable
    Processing /home/myuser/extra/software/sqlacodegen
      Installing build dependencies ... done
      Getting requirements to build wheel ... done
      Installing backend dependencies ... done
      Preparing metadata (pyproject.toml) ... done
    Building wheels for collected packages: UNKNOWN
      Building wheel for UNKNOWN (pyproject.toml) ... done
      Created wheel for UNKNOWN: filename=UNKNOWN-3.0.0rc3-py3-none-any.whl size=1867 sha256=d4d18a167a8f7c8f5c6a2bb9d8703aee259487e55336fc1e475998db872a5a99
      Stored in directory: /tmp/pip-ephem-wheel-cache-pj6osbkb/wheels/c5/88/d7/6594ab3afff35313f447a11f0f0dfe560bffee6b30ace33111
    Successfully built UNKNOWN
    Installing collected packages: UNKNOWN
    Successfully installed UNKNOWN-3.0.0rc3

After which there is a python package actually called UNKNOWN, which I can uninstall with python3 -m pip uninstall UNKNOWN
Sorry I can't help. The pyproject.toml looks fine to me. I haven't really used that format :-/

[agronholm]

Have you tried installing from the PyPI? pip install -U --pre sqlacodegen

[pang-thebasement]

Thanks, that works! And it gave in a blink some nice looking python code! Genius!