How to mention numbers in array while creating dynamic sql

Question

Hi,
I am creating a dynamic sql and in that I am selecting some rows from the table and storing it into the array.
I am firing this sql statement within trigger.
But i got the error:
ORA-06502: PL/SQL: numeric or value error: character to number conversion error
I took the same sql statement (the one which was created dynamically) in the procedure and tried to run it but it gave me the same error.
=========================================================
Begin
type NewValueArray is table of varchar2(4000);
nVal_Array NewValueArray;
Begin
Select
DISCOVERYHOSTNAME,
DISCOVERYMACPRIMARYPHYSICAL,
DISCOVERYSERIALNUMBER
into
nVal_Array(1),
nVal_Array(2),
nVal_Array(3)
from ALT_42_Consolidated
where rowid = 'AAEWNEABXAAAAkxAAA';
EXCEPTION
WHEN others THEN
Raise;
End;
=========================================================
I tried using to_number but still the same error.
Can some body please inform me where I am goofing.
Thanks!

Answer 1

I got a different error, but you need to initialise your nval_array and make sure it can hold three values. The following should work:
declare
  type NewValueArray is table of varchar2(4000);
  nVal_Array NewValueArray := NewValueArray();
Begin
  nval_array.extend(3);
  Select col1, col2, col3
  into nVal_Array(1), nVal_Array(2), nVal_Array(3)
  from tab1
  where rowid = 'AAAGJZAAGAAAAAWAAV';
EXCEPTION
  WHEN others THEN
    Raise;
End;
/