20. PL/pgSQL
CREATE OR REPLACE FUNCTION fnc_test() RETURNS int AS $$
DECLARE
cs CURSOR FOR SELECT * FROM t_test;
rec record;
dum char;
BEGIN
OPEN cs;
LOOP
FETCH cs INTO rec;
IF NOT FOUND THEN
EXIT;
END IF;
RAISE NOTICE 'record is %', rec;
END LOOP;
CLOSE cs;
RETURN 0;
END;
$$ LANGUAGE plpgsql;
21. PL/pgSQL
CREATE OR REPLACE FUNCTION fnc_test() RETURNS int AS $$
DECLARE
cs CURSOR FOR SELECT * FROM t_test;
rec record;
dum char;
BEGIN
OPEN cs;
LOOP
FETCH cs INTO rec;
IF NOT FOUND THEN
EXIT;
END IF;
RAISE NOTICE 'record is %', rec;
END LOOP;
CLOSE cs;
RETURN 0;
END;
$$ LANGUAGE plpgsql;
ループのスコープがわかりにくい
22. PL/pgSQL
CREATE OR REPLACE FUNCTION fnc_test() RETURNS int AS $$
DECLARE
cs CURSOR FOR SELECT * FROM t_test;
rec record;
dum char;
BEGIN
OPEN cs;
LOOP
FETCH cs INTO rec;
IF NOT FOUND THEN
EXIT;
END IF;
RAISE NOTICE 'record is %', rec;
END LOOP;
CLOSE cs;
RETURN 0;
END;
$$ LANGUAGE plpgsql;
ループのスコープがわかりにくい
IFが直感的ではない
26. PL/Python
CREATE OR REPLACE FUNCTION fnc_test()
RETURNS SETOF int AS $$
import plpy
cs = plpy.execute("SELECT * FROM t_test")
for record in cs:
yield record['text']
$$ LANGUAGE plpython2u;
27. PL/Python
CREATE OR REPLACE FUNCTION fnc_test()
RETURNS SETOF int AS $$
import plpy
cs = plpy.execute("SELECT * FROM t_test")
for record in cs:
yield record['text']
$$ LANGUAGE plpython2u;
もちろんPython3も使える
28. PL/Python
CREATE OR REPLACE FUNCTION fnc_test()
RETURNS SETOF int AS $$
import plpy
cs = plpy.execute("SELECT * FROM t_test")
for record in cs:
yield record['text']
$$ LANGUAGE plpython2u;
もちろんPython3も使える
既存のLibraryを再利用できる