Extending user collection dynamically

Question

hello,
I have folloving code:
CREATE TYPE T_my_row OID '4711'
IS OBJECT(field1 varchar2(10), field2 number(10));
CREATE TYPE TT_my_table OID '0815'
IS TABLE OF T_my_row;
declare
my_table TT_my_table := TT_my_table()
begin
  for my_value in (select rownum, 'a' as filed1, 2 as field2 from dual) loop
    my_table(my_value.rownum) := T_my_row(my_value.filed1,my_value.filed2);
  end loop;
end;
/but this gives me an error:
ORA-06533: Subscript beyond count.
I understand that I need to tell how many entries the table may have.
But how do I do that without providing all rows on initialisation?
Is there something like my_table TT_my_table := TT_my_table(p_max_row_count=>407) ?
bye
TPD

Answer 1

T.PD wrote:
I understand that I need to tell how many entries the table may have.
But how do I do that without providing all rows on initialisation?
Is there something like my_table TT_my_table := TT_my_table(p_max_row_count=>407) ?No. You can use the +.Extend()+ method to add (null) objects to the collection.
In your example's case however, it is much simpler to allow PL/SQL to do all the work for you - extending the collection and populating it using a bulk collect.
E.g.
select T_My_Row( col1, col2 ) bulk collect into my_table from table where ...
Of course, you need to be mindful of the size of the collection created. PGA memory is used - and as dedicated server memory (opposed to shared server memory), it is expensive memory. And not to be needlessly wasted.