On 08/27/2015 06:33 AM, Christopher BROWN wrote:
> Hello Adrian,
>
> Yep, Charles' explanation helped me understand what was going on.
> Before that, I was as confused as you were (in your first reply) about
> how access_mode could be NULL (with the same reasoning). In any case,
> thanks for your links ; I did try searching the web for the answer
> before posting, but got too many irrelevant results given that I had to
> search using very common terms.
>
> I've concluded the the RECORD type is the best-fit for my approach. I
> don't know if it's any faster that using SELECT * with a specific
> %ROWTYPE given that the data doesn't go anywhere outside the function
> body. I don't know if the order in which columns are returned (by
> either SELECT * or using explicit column names matters when using
> %ROWTYPE), although I'll assume that PostgreSQL is smart enough to match
> things up correctly, if I need to write a function that returns
> instances of any given %ROWTYPE in the future.
Order does matter:
create table rowtype_test(id int, fld_1 varchar, fld_2 varchar);
insert into rowtype_test values (1, 'one', 'two');
insert into rowtype_test values (2, 'three', 'four');
CREATE OR REPLACE FUNCTION row_type_test ( )
RETURNS void
LANGUAGE plpgsql
AS $function$
DECLARE
r rowtype_test%rowtype;
BEGIN
FOR r IN
SELECT fld_1, id, fld_2 FROM rowtype_test
LOOP
RAISE NOTICE '%', r;
END LOOP;
RETURN;
END;
$function$
;
test=> select row_type_test();
ERROR: invalid input syntax for integer: "one"
CONTEXT: PL/pgSQL function row_type_test() line 5 at FOR over SELECT rows
>
> Thanks again.
> Christopher
>
>
--
Adrian Klaver
adrian.klaver@aklaver.com
