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--
-- nested calls
--
CREATE FUNCTION nested_call_one(a text) RETURNS text
AS
'q = "SELECT nested_call_two(''%s'')" % a
r = plpy.execute(q)
return r[0]'
LANGUAGE plpythonu ;
CREATE FUNCTION nested_call_two(a text) RETURNS text
AS
'q = "SELECT nested_call_three(''%s'')" % a
r = plpy.execute(q)
return r[0]'
LANGUAGE plpythonu ;
CREATE FUNCTION nested_call_three(a text) RETURNS text
AS
'return a'
LANGUAGE plpythonu ;
-- some spi stuff
CREATE FUNCTION spi_prepared_plan_test_one(a text) RETURNS text
AS
'if "myplan" not in SD:
q = "SELECT count(*) FROM users WHERE lname = $1"
SD["myplan"] = plpy.prepare(q, [ "text" ])
try:
rv = plpy.execute(SD["myplan"], [a])
return "there are " + str(rv[0]["count"]) + " " + str(a) + "s"
except Exception, ex:
plpy.error(str(ex))
return None
'
LANGUAGE plpythonu;
CREATE FUNCTION spi_prepared_plan_test_nested(a text) RETURNS text
AS
'if "myplan" not in SD:
q = "SELECT spi_prepared_plan_test_one(''%s'') as count" % a
SD["myplan"] = plpy.prepare(q)
try:
rv = plpy.execute(SD["myplan"])
if len(rv):
return rv[0]["count"]
except Exception, ex:
plpy.error(str(ex))
return None
'
LANGUAGE plpythonu;
CREATE FUNCTION join_sequences(s sequences) RETURNS text
AS
'if not s["multipart"]:
return s["sequence"]
q = "SELECT sequence FROM xsequences WHERE pid = ''%s''" % s["pid"]
rv = plpy.execute(q)
seq = s["sequence"]
for r in rv:
seq = seq + r["sequence"]
return seq
'
LANGUAGE plpythonu;
-- spi and nested calls
--
select nested_call_one('pass this along');
nested_call_one
-----------------------------------------------------------------
{'nested_call_two': "{'nested_call_three': 'pass this along'}"}
(1 row)
select spi_prepared_plan_test_one('doe');
spi_prepared_plan_test_one
----------------------------
there are 3 does
(1 row)
select spi_prepared_plan_test_one('smith');
spi_prepared_plan_test_one
----------------------------
there are 1 smiths
(1 row)
select spi_prepared_plan_test_nested('smith');
spi_prepared_plan_test_nested
-------------------------------
there are 1 smiths
(1 row)
SELECT join_sequences(sequences) FROM sequences;
join_sequences
----------------
ABCDEFGHIJKL
ABCDEF
ABCDEF
ABCDEF
ABCDEF
ABCDEF
(6 rows)
SELECT join_sequences(sequences) FROM sequences
WHERE join_sequences(sequences) ~* '^A';
join_sequences
----------------
ABCDEFGHIJKL
ABCDEF
ABCDEF
ABCDEF
ABCDEF
ABCDEF
(6 rows)
SELECT join_sequences(sequences) FROM sequences
WHERE join_sequences(sequences) ~* '^B';
join_sequences
----------------
(0 rows)
--
-- plan and result objects
--
CREATE FUNCTION result_nrows_test() RETURNS int
AS $$
plan = plpy.prepare("SELECT 1 UNION SELECT 2")
plpy.info(plan.status()) # not really documented or useful
result = plpy.execute(plan)
if result.status() > 0:
return result.nrows()
else:
return None
$$ LANGUAGE plpythonu;
SELECT result_nrows_test();
INFO: True
CONTEXT: PL/Python function "result_nrows_test"
result_nrows_test
-------------------
2
(1 row)
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