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PL/Python: Convert numeric to Decimal

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The old implementation converted PostgreSQL numeric to Python float,
which was always considered a shortcoming.  Now numeric is converted to
the Python Decimal object.  Either the external cdecimal module or the
standard library decimal module are supported.

From: Szymon Guz <mabewlun@gmail.com>
From: Ronan Dunklau <rdunklau@gmail.com>
Reviewed-by: Steve Singer <steve@ssinger.info>
This commit is contained in:
Peter Eisentraut
2013-07-05 22:41:25 -04:00
parent 02d2b694ee
commit 7919398bac
5 changed files with 138 additions and 34 deletions
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23
doc/src/sgml/plpython.sgml
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@ -310,12 +310,23 @@ $$ LANGUAGE plpythonu;
<listitem>
<para>
PostgreSQL <type>real</type>, <type>double</type>,
and <type>numeric</type> are converted to
Python <type>float</type>. Note that for
the <type>numeric</type> this loses information and can lead to
incorrect results. This might be fixed in a future
release.
PostgreSQL <type>real</type> and <type>double</type> are converted to
Python <type>float</type>.
</para>
</listitem>
<listitem>
<para>
PostgreSQL <type>numeric</type> is converted to
Python <type>Decimal</type>. This type is imported from
the <literal>cdecimal</literal> package if that is available.
Otherwise,
<literal>decimal.Decimal</literal> from the standard library will be
used. <literal>cdecimal</literal> is significantly faster
than <literal>decimal</literal>. In Python 3.3,
however, <literal>cdecimal</literal> has been integrated into the
standard library under the name <literal>decimal</literal>, so there is
no longer any difference.
</para>
</listitem>