While trying to formulate an answer to another user's query on this list, I
came a across what I think is strange behaviour in an SQL funsction:
The 3rd column of my 'contacts' table is 'first_name'.
A regular select will allow me to find this:
SELECT a.attname FROM pg_class c, pg_attribute a WHERE c.relname = 'contacts' and a.attnum = 3 and
a.attrelid=c.oid;
attname
------------first_name
(1 row)
But when turned into a function:
CREATE FUNCTION get_colname (name,smallint)
RETURNS name AS ' SELECT a.attname FROM pg_class c, pg_attribute a WHERE c.relname = ''$1'' and
a.attnum= $2 and a.attrelid=c.oid
'
LANGUAGE SQL;
SELECT get_colname('contacts',3);
get_colname
-------------
(1 row)
The result is empty!?
Even more strange:
SELECT 'x'||get_colname('contacts',3)||'x' as foo;
foo
-----
(1 row)
Should I not be seeing "xx" as the result here!? What's going on? Anyone
wknow why the above function get_colname isn't doing what I expect?
Regards,
Ian Morgan
--
-------------------------------------------------------------------Ian E. Morgan Vice President & C.O.O.
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