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Added more information about the case of the missing lo_truncate

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After some ML message and ticket #104.
This commit is contained in:
Daniele Varrazzo 2012-03-09 12:11:28 +00:00
parent 550130b19e
commit 5473d50a09
2 changed files with 25 additions and 0 deletions
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7
doc/src/extensions.rst
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@ -105,6 +105,13 @@ functionalities defined by the |DBAPI|_.
.. |lo_truncate| replace:: `!lo_truncate()` .. |lo_truncate| replace:: `!lo_truncate()`
.. _lo_truncate: http://www.postgresql.org/docs/current/static/lo-interfaces.html#LO-TRUNCATE .. _lo_truncate: http://www.postgresql.org/docs/current/static/lo-interfaces.html#LO-TRUNCATE
.. warning::
If Psycopg is built with |lo_truncate| support (i.e. if the
:program:`pg_config` used during setup is version >= 8.3), but at
runtime an older libpq is found, Psycopg will fail to import. See
:ref:`the lo_truncate FAQ <faq-lo_truncate>` about the problem.
.. method:: close() .. method:: close()
Close the object. Close the object.

18
doc/src/faq.rst
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@ -161,6 +161,24 @@ I can't compile `!psycopg2`: the compiler says *error: libpq-fe.h: No such file
You need to install the development version of the libpq: the package is You need to install the development version of the libpq: the package is
usually called ``libpq-dev``. usually called ``libpq-dev``.
.. _faq-lo_truncate:
.. cssclass:: faq
`!psycopg2` raises `!ImportError` with message *_psycopg.so: undefined symbol: lo_truncate* when imported.
This means that Psycopg has been compiled with |lo_truncate|_ support,
which means that the libpq used at compile time was version >= 8.3, but at
runtime an older libpq library is found. You can use::
$ ldd /path/to/packages/psycopg2/_psycopg.so | grep libpq
to find what is the version used at runtime.
You can avoid the problem by using the same version of the
:program:`pg_config` at install time and the libpq at runtime.
.. |lo_truncate| replace:: `!lo_truncate()`
.. _lo_truncate: http://www.postgresql.org/docs/current/static/lo-interfaces.html#LO-TRUNCATE
Psycopg raises *ImportError: cannot import name tz* on import in mod_wsgi / ASP, but it works fine otherwise. Psycopg raises *ImportError: cannot import name tz* on import in mod_wsgi / ASP, but it works fine otherwise.
If `!psycopg2` is installed in an egg_ (e.g. because installed by If `!psycopg2` is installed in an egg_ (e.g. because installed by
:program:`easy_install`), the user running the program may be unable to :program:`easy_install`), the user running the program may be unable to