Iterate over table returned by function - postgresql

Question

I've declared two functions (duplicate_iofs & duplicate_ioftypes) that both return a table after performing INSERT operations :
CREATE OR REPLACE FUNCTION duplicate_iofs(IN iof_group_src_id integer, IN iof_group_dst_id integer)
RETURNS TABLE(src_id integer, new_id integer) AS $$
BEGIN
-- DO INSERT REQUESTS
END;
CREATE OR REPLACE FUNCTION duplicate_ioftypes(IN iof_group_src_id integer, IN iof_group_dst_id integer)
RETURNS TABLE(src_id integer, new_id integer) AS $$
BEGIN
-- DO INSERT REQUESTS
END;
How can I do something similar like that in a third function :
-- 1. Call duplicate_iofs(...) and store the result table (e.g. iofs_table)
-- 2. Call duplicate_ioftypes(...) and store the result table (e.g. ioftypes_table).
-- 3. Iterate through 'iofs_table' and 'ioftypes_table' with nested loops :
FOR iof_row IN SELECT * FROM iofs_table LOOP
FOR ioftype_row IN SELECT * FROM ioftypes_table LOOP
-- DO SOMETHING
END LOOP;
END LOOP;
Note : duplicate_iofs() and duplicate_ioftypes() MUST be called only once and thus, MUST NOT be called into the nested loop.

Answer 1

You can try something like this:
DECLARE
curs_iof CURSOR FOR SELECT * FROM iofs_table;
curs_ioftype CURSOR FOR SELECT * FROM ioftypes_table;
BEGIN
OPEN SCROLL curs_iof;
OPEN SCROLL curs_ioftype;
FETCH curs_iof INTO iof_row;
WHILE FOUND LOOP
FETCH FIRST FROM curs_ioftype INTO ioftype_row;
WHILE FOUND LOOP
-- DO SOMETHING
FETCH curs_ioftype INTO ioftype_row;
END LOOP;
FETCH curs_iof INTO iof_row;
END LOOP;
CLOSE curs_iof;
CLOSE curs_ioftype;
END;
Details here.