Contents
An implementation of the psycopg2 module using cffi. The module is currently compatible with Psycopg 2.5.
Installation
You can install psycopg2cffi
from PyPI:
pip install psycopg2cffi
Or from source:
python setup.py install
Installation requirements are the same as for psycopg2
- you must
have libpq
headers, pg_config
somewhere on your $PATH
,
Python development headers (python-dev
or similar), and ffi-dev
for cffi
.
Installation was tested on Ubuntu 12.04, Ubuntu 14.04, CentOS (RHEL 5.0),
OS X 10.8 - 10.10.
It should be possible to make it work on Windows, but I did not test it.
This module works under CPython 2.6+, CPython 3.2+, PyPy 2 and PyPy 3 (PyPy version should be at least 2.0, which is ancient history now).
To use this package with Django or SQLAlchemy invoke a compatibility
hook (for example, from settings.py
in case of Django, or
from a psycopg2.py
file in site-packages of your virtual env):
from psycopg2cffi import compat compat.register()
This will map psycopg2cffi
to psycopg2
, so now any code that
does import psycopg2
will use psycopg2cffi
.
Submit issues to https://github.com/chtd/psycopg2cffi/issues
If you notice that psycopg2cffi
under PyPy is noticeably slower than
psycopg2
under CPython, submit this to the issues too - it should
not be the case.
This is a port of (Michael van Tellingen port https://github.com/mvantellingen/psycopg2-ctypes of Alex Gaynor's RPython port (https://bitbucket.org/alex_gaynor/pypy-postgresql/overview) of psycopg2 to Python + ctypes) to cffi.
The main motivation for a port was speed - the writeup with benchmarks is here: http://chtd.ru/blog/bystraya-rabota-s-postgres-pod-pypy/?lang=en
Development
To run tests, install pytest
and run them with:
py.test psycopg2cffi
Note that for cffi>=1.0
you need to run python setup.py develop
to rebuild _libpq.so
(if you changed bindings).
And for cffi<1.0
(only PyPy 2.5 and below) you need to run
python setup.py install
once to generate psycopg2cffi/_config.py
,
otherwise each import will run config and notify tests will fail.
You can also run Django tests. You need to checkout Django source, add psycopg2 compat as described above, and, from the root of the Django checkout:
PYTHONPATH=`pwd` ./tests/runtests.py \ --settings=psycopg2cffi.tests.psycopg2_tests.testconfig
In case of problems with Django tests, see official Django docs https://docs.djangoproject.com/en/dev/internals/contributing/writing-code/unit-tests/#running-the-unit-tests
Release notes
2.7.5 (31 October 2016)
Windows wheels support added by ryoyoko (#69).
Bugfixes:
- Non-ascii notice messages fixed by asterite3 (#72)
- AsIs with non-text/bytes fixed by jinty (#64)
- Silent failures in copy_from and copy_to fixed by gobbledygook88 (#62)
- Infinite recursion error fixed in errorcodes.lookup (#68)
- Typos in README fixed by PavloKapyshin (#66)
2.7.4 (01 April 2016)
Fix a regression with error handling when establishing the connection (#61)
2.7.3 (29 February 2016)
Fix a bug with non-ascii error messages (#56)
2.7.2 (06 August 2015)
Fixes for FreeBSD support by Andrew Coleman
2.7.1 (20 June 2015)
JSONB support
2.7.0 (21 May 2015)
Use cffi 1.0, which makes installation more robust, and import is faster. cffi<1.0 is used now only for PyPy 2.5 or below.
2.6.1 (08 Feb 2015)
Fixing things that were broken in 2.6.0:
- Fix issue #31 - bigint on 32-bit
- Fix issue #32 - register_type and unicode
2.6.0 (24 Jan 2015)
- Python 3 support
- A bit faster reading of int, long, float, double fields
2.5.1 (14 May 2014)
- Small bugfixes
2.5.0 (3 Sep 2013)
- Bugfixes and a lot of compatibility work by Daniele Varrazzo
Older releases lack release notes, first release of psycopg2cffi around Nov 2012.