postgresql/contrib/ltree_plpython/sql/ltree_plpython.sql
Peter Eisentraut cac7658205 Add transforms feature
This provides a mechanism for specifying conversions between SQL data
types and procedural languages.  As examples, there are transforms
for hstore and ltree for PL/Perl and PL/Python.

reviews by Pavel Stěhule and Andres Freund
2015-04-26 10:33:14 -04:00

38 lines
692 B
PL/PgSQL

CREATE EXTENSION plpython2u;
CREATE EXTENSION ltree_plpython2u;
CREATE FUNCTION test1(val ltree) RETURNS int
LANGUAGE plpythonu
TRANSFORM FOR TYPE ltree
AS $$
plpy.info(repr(val))
return len(val)
$$;
SELECT test1('aa.bb.cc'::ltree);
CREATE FUNCTION test1n(val ltree) RETURNS int
LANGUAGE plpython2u
TRANSFORM FOR TYPE ltree
AS $$
plpy.info(repr(val))
return len(val)
$$;
SELECT test1n('aa.bb.cc'::ltree);
CREATE FUNCTION test2() RETURNS ltree
LANGUAGE plpythonu
TRANSFORM FOR TYPE ltree
AS $$
return ['foo', 'bar', 'baz']
$$;
-- plpython to ltree is not yet implemented, so this will fail,
-- because it will try to parse the Python list as an ltree input
-- string.
SELECT test2();