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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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9
src/pl/plpython/sql/plpython_types.sql
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@@ -86,14 +86,19 @@ SELECT * FROM test_type_conversion_int8(null);
CREATE FUNCTION test_type_conversion_numeric(x numeric) RETURNS numeric AS $$
plpy.info(x, type(x))
# print just the class name, not the type, to avoid differences
# between decimal and cdecimal
plpy.info(x, x.__class__.__name__)
return x
$$ LANGUAGE plpythonu;
/* The current implementation converts numeric to float. */
SELECT * FROM test_type_conversion_numeric(100);
SELECT * FROM test_type_conversion_numeric(-100);
SELECT * FROM test_type_conversion_numeric(100.0);
SELECT * FROM test_type_conversion_numeric(100.00);
SELECT * FROM test_type_conversion_numeric(5000000000.5);
SELECT * FROM test_type_conversion_numeric(1234567890.0987654321);
SELECT * FROM test_type_conversion_numeric(-1234567890.0987654321);
SELECT * FROM test_type_conversion_numeric(null);