Question

This is my function:

DECLARE
f_ids integer[] := '{}';
BEGIN
SELECT INTO f_ids  "fileId" FROM "tbFiles" WHERE "size" <= $2 AND
"size" >=$1 ;
RETURN f_ids;
END;

This function should return bigint[], but when I try to run it I get this error:

SELECT "GetFilesBySize"(0,888)

ERROR:  array value must start with "{" or dimension information
CONTEXT:  PL/pgSQL function "GetFilesBySize" line 4 at SQL statement 

It seems to me that the array is properly initialized, so where is the mistake?

Answer 1

This will work:

DECLARE
    f_ids integer[];
BEGIN
    SELECT INTO f_ids array_agg(fileId) FROM tbFiles WHERE size <= $2 AND size >=$1;
    RETURN f_ids;
END

But I think, you are better off using real set returning functions or use RETURN QUERY. Lookup the PostgreSQL manual for the both terms.