Re: passing array as argument and returning an array in

Jenny Zhang wrote:


Jenny,

although this is old but i find it worth mentioning tom's
comment on it. I hit your comment on facing similar issue.

The cited example is pretty iffy since it assumes that the valid array
entries are all > 0.  In recent PG version you can use the array_upper
and array_lower functions instead:

    for i in array_lower(a,1) .. array_upper(a,1) loop
        -- do something with a[i]
    end loop;

            regards, tom lane





>I got this when I was searching for something else.  I will forward this
>to you.
>http://archives.postgresql.org/pgsql-general/2003-11/msg00852.php
>CREATE or REPLACE FUNCTION foo(integer[]) RETURNS int AS
>'DECLARE
>        a alias for $1;
>        index   integer := 1;
>        total   integer := 0;
>BEGIN
>        WHILE a[index] > 0
>        LOOP
>                total := total + a[index];
>                index := index + 1;
>        END LOOP;
>
>        RETURN total;
>        END;
>' LANGUAGE 'plpgsql';
>
>
>
>test=> select foo('{1,2}');
> foo
>-----
>   3
>(1 row)
>On Tue, 2003-12-16 at 03:25, K. Deepa wrote:
>
>
>>Hi all,
>>       I am using postgresql7.4. How to handle arrays in plpgsql. How can
>>I pass an array. Is it possible to retrieve values from an array by
>>indexing it like
>>
>>argument : '{1,2,3}'
>>Return value : varchar array
>>
>>Variables :
>>---------
>>
>>a alias for $1
>>b _varchar
>>
>>Usage :
>>-----
>>
>>b[1] = a[1];
>>b[2] = a[2];
>>
>>return b;
>>
>>Is it possible.
>>
>>TIA,
>>
>>