this could be start point for discussion:
CREATE OR REPLACE FUNCTION public."arraysToHstore" (IN a TEXT[], OUT c hstore[])
RETURNS hstore[]
AS
$BODY$
DECLARE
i INT;
elements INT;
dim INT;
BEGIN
elements := array_length(a,2); -- # of elements in each dimension
dim := array_length(a,1); -- # of dimensions
a := string_to_array(array_to_string(a, '|', 'NULL'), '|', 'NULL'); --rewrite multidimensional array into single dimensional
FOR i IN 0..(dim -1) LOOP --loop throug all dimensions to create hsore array (0 is for first elment in rewrited array)
c[i+1] = hstore (a[(i*elements)+1: (i+1)*elements]); --create hstore array element using part of array "a", this part (window) is moving while loop is evaluated)
END LOOP;
END
$BODY$
LANGUAGE plpgsql SECURITY DEFINER IMMUTABLE STRICT;
--usage example
SELECT (public."arraysToHstore"('{{"f1", "1", "f3", "123", "f4", "ABC"}, {"f5", "2", "f6", "345", "f7", "DEF"}}')::hstore[])[2]
This works for me (PostgreSQL 9.1.2).
You can pass whatever text array You want (any size, but 2 dimensions only) and You will receive 1 dimentional hstore array with number of elements corresponding to input array's dimensions)
Regards,
Bartek
2012/2/16 ChoonSoo Park <luispark@xxxxxxxxx>
I would like to construct hstore array from 2 dimensional array.
For example,
'{{f1, 1, f2, 123, f3, ABC, ...}, {f1, 2, f2, 345, f3, DEF, ...}}'
Should be converted to
2 hstore values
"f1"=>"1", "f2"=>"123", "f3"=>"ABC", ...
"f2"=>"2", "f2"=>"345", "f3"=>"DEF", ...
create or replace function convertHStore(p1 text[][]) RETURNS hstore[]
hstore function requires text[] to convert array to hstore. Therefore I should be able to dereference 2 dimensional array element.
Inside this custom plpgsql function, p1[1] is not valid syntax to dereference the 1st element in p1.
Anyone knows how to solve this problem?
Thank you,
Choon Park
