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Document the psycopg2-binary package
This commit is contained in:
Daniele Varrazzo
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README.rst
32
README.rst
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@ -25,29 +25,39 @@ Documentation is included in the ``doc`` directory and is `available online`__.
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.. __: http://initd.org/psycopg/docs/
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For any other resource (source code repository, bug tracker, mailing list)
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please check the `project homepage`__.
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Installation
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------------
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If your ``pip`` version supports wheel_ packages it should be possible to
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install a binary version of Psycopg including all the dependencies from PyPI_.
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Just run::
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Building Psycopg requires a few prerequisites (a C compiler, some development
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packages): please check the install_ and the faq_ documents in the ``doc`` dir
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or online for the details.
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If prerequisites are met, you can install psycopg like any other Python
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package, using ``pip`` to download it from PyPI_::
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$ pip install -U pip # make sure your pip is up-to-date
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$ pip install psycopg2
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If you want to build Psycopg from source you will need some prerequisites (a C
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compiler, development packages): please check the install_ and the faq_
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documents in the ``doc`` dir for the details.
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or using ``setup.py`` if you have downloaded the source package locally::
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$ python setup.py build
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$ sudo python setup.py install
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You can also obtain a stand-alone package, not requiring a compiler or
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external libraries, by installing the ``psycopg2-binary`` package from PyPI::
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$ pip install psycopg2-binary
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The binary package is a practical choice for development and testing but in
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production it is advised to use the package built from sources.
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.. _wheel: http://pythonwheels.com/
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.. _PyPI: https://pypi.python.org/pypi/psycopg2
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.. _install: http://initd.org/psycopg/docs/install.html#install-from-source
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.. _faq: http://initd.org/psycopg/docs/faq.html#faq-compile
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For any other resource (source code repository, bug tracker, mailing list)
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please check the `project homepage`__.
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.. __: http://initd.org/psycopg/
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@ -12,16 +12,6 @@ to use Psycopg on a different Python implementation (PyPy, Jython, IronPython)
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there is an experimental `porting of Psycopg for Ctypes`__, but it is not as
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mature as the C implementation yet.
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The current `!psycopg2` implementation supports:
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..
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NOTE: keep consistent with setup.py and the /features/ page.
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- Python 2 versions from 2.6 to 2.7
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- Python 3 versions from 3.2 to 3.6
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- PostgreSQL server versions from 7.4 to 10
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- PostgreSQL client library version from 9.1
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.. _PostgreSQL: http://www.postgresql.org/
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.. _Python: http://www.python.org/
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.. _libpq: http://www.postgresql.org/docs/current/static/libpq.html
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@ -32,94 +22,20 @@ The current `!psycopg2` implementation supports:
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.. index::
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single: Install; from PyPI
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single: Install; wheel
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single: Wheel
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single: Prerequisites
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Binary install from PyPI
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------------------------
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Prerequisites
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-------------
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`!psycopg2` is `available on PyPI`__ in the form of wheel_ packages for the
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most common platform (Linux, OSX, Windows): this should make you able to
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install a binary version of the module including all the dependencies simply
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using:
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The current `!psycopg2` implementation supports:
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.. code-block:: console
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..
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NOTE: keep consistent with setup.py and the /features/ page.
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$ pip install psycopg2
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Make sure to use an up-to-date version of :program:`pip` (you can upgrade it
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using something like ``pip install -U pip``)
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.. __: PyPI_
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.. _PyPI: https://pypi.python.org/pypi/psycopg2/
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.. _wheel: http://pythonwheels.com/
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.. note::
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The binary packages come with their own versions of a few C libraries,
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among which ``libpq`` and ``libssl``, which will be used regardless of other
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libraries available on the client: upgrading the system libraries will not
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upgrade the libraries used by `!psycopg2`. Please build `!psycopg2` from
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source if you want to maintain binary upgradeability.
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.. warning::
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Because the `!psycopg` wheel package uses its own ``libssl`` binary, it is
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incompatible with other extension modules binding with ``libssl`` as well,
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for instance the Python `ssl` module: the result will likely be a
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segfault. If you need using both `!psycopg2` and other libraries using
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``libssl`` please :ref:`disable the use of wheel packages for Psycopg
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<disable-wheel>`.
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.. index::
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single: Install; disable wheel
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single: Wheel; disable
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.. _disable-wheel:
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Disabling wheel packages
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^^^^^^^^^^^^^^^^^^^^^^^^
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If you want to disable the use of wheel binary packages and use the system
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system libraries available on your client you can use the :command:`pip`
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|--no-binary option|__:
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.. code-block:: console
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$ pip install --no-binary psycopg2
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.. |--no-binary option| replace:: ``--no-binary`` option
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.. __: https://pip.pypa.io/en/stable/reference/pip_install/#install-no-binary
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which can be specified in your :file:`requirements.txt` files too, e.g. use:
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.. code-block:: none
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psycopg2>=2.7,<2.8 --no-binary psycopg2
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to use the last bugfix release of the `!psycopg2` 2.7 package, specifying to
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always compile it from source. Of course in this case you will have to meet
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the :ref:`build prerequisites <build-prerequisites>`.
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.. index::
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single: Install; from source
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.. _install-from-source:
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Install from source
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-------------------
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.. _source-package:
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You can download a copy of Psycopg source files from the `Psycopg download
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page`__ or from PyPI_.
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.. __: http://initd.org/psycopg/download/
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- Python 2 versions from 2.6 to 2.7
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- Python 3 versions from 3.2 to 3.6
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- PostgreSQL server versions from 7.4 to 10
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- PostgreSQL client library version from 9.1
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@ -128,8 +44,8 @@ page`__ or from PyPI_.
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Build prerequisites
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^^^^^^^^^^^^^^^^^^^
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These notes illustrate how to compile Psycopg on Linux. If you want to compile
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Psycopg on other platforms you may have to adjust some details accordingly.
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The build prerequisites are to be met in order to install Psycopg from source
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code, either from a source distribution package or from PyPI.
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Psycopg is a C wrapper around the libpq_ PostgreSQL client library. To install
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it from sources you will need:
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@ -161,6 +77,12 @@ it from sources you will need:
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Once everything is in place it's just a matter of running the standard:
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.. code-block:: console
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$ pip install psycopg2
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or, from the directory containing the source code:
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.. code-block:: console
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$ python setup.py build
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@ -197,12 +119,92 @@ which is OS-dependent (for instance setting a suitable
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.. index::
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single: Install; from PyPI
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single: Install; wheel
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single: Wheel
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Binary install from PyPI
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------------------------
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`!psycopg2` is also `available on PyPI`__ in the form of wheel_ packages for
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the most common platform (Linux, OSX, Windows): this should make you able to
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install a binary version of the module, not requiring the above build or
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runtime prerequisites, simply using:
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.. code-block:: console
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$ pip install psycopg2-binary
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Make sure to use an up-to-date version of :program:`pip` (you can upgrade it
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using something like ``pip install -U pip``)
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.. __: PyPI-binary_
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.. _PyPI-binary: https://pypi.python.org/pypi/psycopg2-binary/
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.. _wheel: http://pythonwheels.com/
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.. note::
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The binary packages come with their own versions of a few C libraries,
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among which ``libpq`` and ``libssl``, which will be used regardless of other
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libraries available on the client: upgrading the system libraries will not
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upgrade the libraries used by `!psycopg2`. Please build `!psycopg2` from
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source if you want to maintain binary upgradeability.
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.. warning::
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The `!psycopg2` wheel package comes packaged, among the others, with its
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own ``libssl`` binary. This may create conflicts with other extension
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modules binding with ``libssl`` as well, for instance with the Python
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`ssl` module: in some cases, under concurrency, the interaction between
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the two libraries may result in a segfault. In case of doubts you are
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advised to use a package built from source.
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.. index::
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single: Install; disable wheel
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single: Wheel; disable
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.. _disable-wheel:
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Disabling wheel packages for Psycopg 2.7
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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In version 2.7.x, `pip install psycopg2` would have tried to install the wheel
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binary package of Psycopg. Because of the problems the wheel package have
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displayed, `psycopg2-binary` has become a separate package, and from 2.8 it
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has become the only way to install the binary package.
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If you are using psycopg 2.7 and you want to disable the use of wheel binary
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packages, relying on the system system libraries available on your client, you
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can use the :command:`pip` |--no-binary option|__:
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.. code-block:: console
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$ pip install --no-binary psycopg2
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.. |--no-binary option| replace:: ``--no-binary`` option
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.. __: https://pip.pypa.io/en/stable/reference/pip_install/#install-no-binary
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which can be specified in your :file:`requirements.txt` files too, e.g. use:
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.. code-block:: none
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psycopg2>=2.7,<2.8 --no-binary psycopg2
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to use the last bugfix release of the `!psycopg2` 2.7 package, specifying to
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always compile it from source. Of course in this case you will have to meet
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the :ref:`build prerequisites <build-prerequisites>`.
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.. index::
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single: setup.py
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single: setup.cfg
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Non-standard builds
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^^^^^^^^^^^^^^^^^^^
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-------------------
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If you have less standard requirements such as:
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@ -242,7 +244,7 @@ order to create a debug package:
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- Edit the ``setup.cfg`` file adding the ``PSYCOPG_DEBUG`` flag to the
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``define`` option.
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- :ref:`Compile and install <source-package>` the package.
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- :ref:`Compile and install <build-prerequisites>` the package.
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- Set the :envvar:`PSYCOPG_DEBUG` environment variable:
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