Oracle nested object table

Question

I've posted this question in sql/plsql forum but it may belong here.
My question is how can i individually initialize/assign record to my nested table type wf_acts_t or wf_trans_t( either one or the other)?
It maybe simply a case where I dont know how to accomplish this goal but I've got a workaround.
CREATE TYPE wf_act_t IS OBJECT (
a_NAME VARCHAR2 (100)
CREATE TYPE wf_acts_t IS
TABLE OF wf_act_t
CREATE TYPE wf_tran_t IS OBJECT (
wf_name VARCHAR2 (100)
CREATE TYPE wf_trans_t IS
TABLE OF wf_tran_t
CREATE TYPE act_t IS OBJECT (
act wf_acts_t,
tran wf_trans_t
create type bunch_of_act is table of act_t
declare
my_acts bunch_of_act := bunch_of_act();
v_loop_count BINARY_INTEGER := 1;
begin
for wf_lkup_rec in(select * from wf_activities_lkup)
loop
my_acts.extend;
/*here you cannot address wf_acts_t or wf_trans_t individually*/
my_acts(v_loop_COUNT) :=
act_t(
wf_acts_t(wf_act_t(null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null)
wf_trans_t ( wf_tran_t (null))
v_loop_count :=
v_loop_count +1;
end loop;
v_loop_count := 1;
dbms_output.put_line (my_acts (1).act(1).a_name);
end;

Answer 1

It can be something like that (I'm sorry for
very silly example):
SQL> declare 
  2     my_acts bunch_of_act := bunch_of_act(); 
  3     v_loop_count BINARY_INTEGER := 1; 
  4     ptr1 wf_acts_t; 
  5     ptr2 wf_trans_t; 
  6  begin     
  7 
  8    for wf_lkup_rec in(select e.* from emp e where rownum < 3) loop   
  9 
10     /* Declare new table object*/
11      ptr1 := wf_acts_t();
12 
13     /* Here we fill table individually */
14     -- Add some loop:
15 
16      for k in 1..2 loop
17       ptr1.extend;    
18       ptr1(ptr1.last) := wf_act_t(wf_lkup_rec.ename);        
19      end loop;
20 
21     /* Declare new table object*/    
22      ptr2 := wf_trans_t();
23 
24     /* Here we fill table individually */    
25     -- Add some loop
26     for k in 1..2 loop
27       ptr2.extend;
28       ptr2(ptr2.last) := wf_tran_t(wf_lkup_rec.empno);    
29     end loop;      
30 
31     my_acts.extend;
32     my_acts(my_acts.last) :=  act_t(ptr1, ptr2);
33 
34    end loop;
35 
36    /* Individually take elements */
37 
38    for j in 1..my_acts.count loop
39    
40       dbms_output.put_line('Element ' || j || ' of top colletion contains '); 
41 
42       for k in 1..my_acts(j).act.count loop
43           dbms_output.put_line(' act with name ' || my_acts(j).act(k).a_name); 
44       end loop;
45 
46       dbms_output.put_line('and');
47 
48       for k in 1..my_acts(j).tran.count loop
49           dbms_output.put_line(' tran with id ' || my_acts(j).tran(k).wf_name);
50       end loop;
51    
52    end loop;
53    
54  end;
55  /
Element 1 of top colletion contains
act with name SMITH
act with name SMITH
and
tran with id 7369
tran with id 7369
Element 2 of top colletion contains
act with name ALLEN
act with name ALLEN
and
tran with id 7499
tran with id 7499
&nbsp
PL/SQL procedure successfully completed.Rgds.