Обсуждение: puzzled by SELECT INTO

Hi all. Im having some trouble here that cannot understand.
Consider this function:
CREATE OR REPLACE FUNCTION read_words(bigint, varchar)
returns varchar
as
$$
declare   returnValue varchar ;
BEGIN   select * into returnValue  from array_to_string(array(select word 
from words where page_id=$1 and word_position in ($2)), ' ');
return returnValue;
END;
$$ language plpgsql;

So far, so good. But...
select * from read_words(99466::bigint, '2994,2995,2996');read_words
------------

(1 row)

But...if i do a
select  * from array_to_string(array(select word from words where 
page_id=99466 and word_position in (2994,2995,2996)), ' ')      array_to_string
-----------------------------man page inside

Means that the query itself seems OK, but something in the SELECT INTO 
thing is not working to me.
Mmmm...i guess is not that. I just make the sql version of that function
CREATE OR REPLACE FUNCTION read_words(bigint, varchar)
returns varchar
as
$$
select * from array_to_string(array(select word from words where 
page_id=$1 and word_position in ($2)), ' ');
$$
language sql;

with the same (NULL) results....Looks like im having some mistake near 
'and word_position in ($2)...'
Wreird enough to me, need some advice plz!

Thanks!
Gerardo

On 10/30/07, Gerardo Herzig <gherzig@fmed.uba.ar> wrote:
> Wreird enough to me, need some advice plz!

CREATE OR REPLACE FUNCTION READ_WORDS(BIGINT, INT[])
RETURNS VARCHAR
AS
$$ DECLARE   RETURNVALUE VARCHAR; BEGIN   SELECT ARRAY_TO_STRING(ARRAY(     SELECT WORD     FROM WORDS WHERE PAGE_ID=$1
   AND WORD_POSITION = ANY ($2)   ), ' ') INTO RETURNVALUE;   RETURN RETURNVALUE; END;
 
$$ LANGUAGE PLPGSQL;

SELECT READ_WORDS(99466, '{2994,2995,2996}');

See:
http://www.postgresql.org/docs/8.2/static/arrays.html

Rodrigo De León wrote:

>On 10/30/07, Gerardo Herzig <gherzig@fmed.uba.ar> wrote:
>  
>
>>Wreird enough to me, need some advice plz!
>>    
>>
>
>CREATE OR REPLACE FUNCTION READ_WORDS(BIGINT, INT[])
>RETURNS VARCHAR
>AS
>$$
>  DECLARE
>    RETURNVALUE VARCHAR;
>  BEGIN
>    SELECT ARRAY_TO_STRING(ARRAY(
>      SELECT WORD
>      FROM WORDS WHERE PAGE_ID=$1
>      AND WORD_POSITION = ANY ($2)
>    ), ' ') INTO RETURNVALUE;
>    RETURN RETURNVALUE;
>  END;
>$$ LANGUAGE PLPGSQL;
>
>SELECT READ_WORDS(99466, '{2994,2995,2996}');
>
>See:
>http://www.postgresql.org/docs/8.2/static/arrays.html
>
>
>  
>
Mmmm, yes, that make perfect sense. I did 'resolve' the previous 
situation by using EXECUTE, i will try your solution now.

Gracias Rodrigo.
Gerardo