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Added recipe to get Python floats from Postgres decimals in the FAQ.

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Daniele Varrazzo 2010-04-14 01:05:36 +01:00
parent 0ac4c8ac17
commit 431920b367
1 changed files with 14 additions and 0 deletions
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doc/src/faq.rst
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@ -70,6 +70,20 @@ My database is Unicode, but I receive all the strings as UTF-8 `str`. Can I rece
See :ref:`unicode-handling` for the gory details.
Psycopg converts :sql:`decimal`\/\ :sql:`numeric` database types into Python `!Decimal` objects. Can I have `!float` instead?
You can register the `~psycopg2.extensions.FLOAT` typecaster to be used in
place of `~psycopg2.extensions.DECIMAL`::
DEC2FLOAT = psycopg2.extensions.new_type(
psycopg2.extensions.DECIMAL.values,
'DEC2FLOAT',
psycopg2.extensions.FLOAT)
psycopg2.extensions.register_type(DEC2FLOAT)
See :ref:`type-casting-from-sql-to-python` to read the relevant
documentation. If you find `!psycopg2.extensions.DECIMAL` not avalable, use
`!psycopg2._psycopg.DECIMAL` instead.
I can't compile `!psycopg2`: the compiler says *error: Python.h: No such file or directory*. What am I missing?
You need to install a Python development package: it is usually called
``python-dev``.