Updating a table arry in pl/sql

Question

I have the folowing:
SQL:
create or replace type my_object_type is object (id number, some_column varchar2);
create type my object_table_type is table of my_object_type;
PLSQL:
create or replace package body my_package
is
l_tab my_object_table_type;
procedure main
is
begin
select cast ( multiset( select my_object_type
( id
, some_column )
from ( select x , y
from some_table ) ) as my_object_table_type )
into l_tab
from dual;
/* so far so good. i loaded some values in l_tab. but know i would like to be able to update specific records in l_tab .... where some_column = <value>
but i havent got a clue how to do this .... is it possible or do i need some other approach? After some updates i need to do sorting and grouping, so i realy need
the SQL engine */
end main;
end my_package;
Who can help me?
Thanks, Eppo

Answer 1

you can do this even with reinserting in the same collection, i knowNo, at least not with a BULK COLLECT method. The collections initializes to NULL in that case.
could elaborate on this solution showing an example where an external table is joined in a way that values in the collection are used to limit the ros returned in the subquerynot sure where the external table comes into play now: In your first post you were just talking about updating the collection.
In any case I still think with around 7000 rows you don't need to restrict the "update" to a subset of the collection.
make an example where two columns are updated using the same correllated subqueryUsing the same principle:
SQL> create or replace type my_object_type is object
  id number,
  some_column varchar2 (30)
Type created.
SQL> create or replace type my_object_table_type is table of my_object_type;
Type created.
SQL> set timing on
SQL> declare
  l_tab    my_object_table_type;
  l2_tab   my_object_table_type;
begin
  select my_object_type (object_id, object_name)
    bulk collect into l_tab
    from all_objects
   where rownum <= 10000;
  l2_tab := l_tab;
  select my_object_type (case when t.id < 5000 then t2.num_rows else t.id end,
                         case when t.some_column = 'TABLE' then t2.table_name else t.some_column end
    bulk collect into l2_tab
    from table (l_tab) t, user_tables t2
   where t.some_column = t2.table_name(+);
  l_tab := l2_tab;
  dbms_output.put_line ('Collection Count: ' || l_tab.count);
end my_package;
Collection Count: 10000
PL/SQL procedure successfully completed.
Elapsed: 00:00:02.70