Guy Fraser wrote:
> This is what I want to do:
>
> select attribute,array_list(values,1,sizeof(values)) as value from av_list;
>
> Turn :
> attr6 | {val3,val7,val4,val5}
>
> Into :
> attr6 | val3
> attr6 | val7
> attr6 | val4
> attr6 | val5
You didn't mention the version of PostgreSQL. If you're using < 7.3, good luck
;-). If you are using 7.3, the following works:
DROP TABLE mail_aliases;
CREATE TABLE mail_aliases( a_mailbox text, a_destination text[]
);
INSERT INTO mail_aliases VALUES ('alias1', '{dest1}');
INSERT INTO mail_aliases VALUES ('alias2', '{dest2,dest1}');
INSERT INTO mail_aliases VALUES ('alias3', '{dest3,dest4}');
INSERT INTO mail_aliases VALUES ('alias4', '{dest3,dest4,dest5}');
INSERT INTO mail_aliases VALUES ('alias5', '{dest6,dest7}');
INSERT INTO mail_aliases VALUES ('alias6', '{dest3,dest7,dest4,dest5}');
CREATE TYPE mail_aliases_list_type AS (a_mailbox text, a_destination_el text);
CREATE OR REPLACE FUNCTION mail_aliases_list() RETURNS SETOF
mail_aliases_list_type AS '
DECLARE rec record; retrec record; low int; high int;
BEGIN FOR rec IN SELECT a_mailbox, a_destination FROM mail_aliases LOOP SELECT INTO low
replace(split_part(array_dims(rec.a_destination),'':'',1),''['','''')::int; SELECT INTO high
replace(split_part(array_dims(rec.a_destination),'':'',2),'']'','''')::int;
FOR i IN low..high LOOP SELECT INTO retrec rec.a_mailbox, rec.a_destination[i]; RETURN NEXT retrec; END LOOP;
ENDLOOP; RETURN;
END;
' LANGUAGE 'plpgsql';
regression=# SELECT a_mailbox, a_destination_el FROM mail_aliases_list(); a_mailbox | a_destination_el
-----------+------------------ alias1 | dest1 alias2 | dest2 alias2 | dest1 alias3 | dest3 alias3 |
dest4alias4 | dest3 alias4 | dest4 alias4 | dest5 alias5 | dest6 alias5 | dest7 alias6 | dest3 alias6
| dest7 alias6 | dest4 alias6 | dest5
(14 rows)
HTH,
Joe
