Update under apex_collection

Question

Hi gurus,
Spent many fruitless time on this . It is time to call for help.
Following is my process of creating, deleting, update member attributes plus my report query.
My issue : updates( Ename) and deletion( a member) are working. BUT if deletion occurs then updates on all records
after the deletion point are messed up. ex: if I delete seq_id 4 then all subsequent updates for record with seq_id > 4 won't work.
The issue is I lost the original seq_id after the deletion but I don't know how to resolve it. Can you help ?
Thanks.
Zeng
--create collection
if apex_collection.collection_exists(p_collection_name => 'TEST_EMP')
then apex_collection.delete_collection (p_collection_name => 'TEST_EMP');
end if;
apex_collection.create_collection_from_query (p_collection_name => 'TEST_EMP',
p_query => 'select EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO from test_emp
order by empno' );
--delete
FOR r in 1..APEX_APPLICATION.G_F01.COUNT
LOOP
apex_collection.delete_member
(p_collection_name =>'TEST_EMP',p_seq => apex_application.G_F01(r));
commit;
end loop
-- update
FOR r in 1..APEX_APPLICATION.G_F01.COUNT
LOOP
apex_collection.update_member_attribute
p_collection_name => 'TEST_EMP',
p_seq => APEX_APPLICATION.G_F01(r),
p_attr_number => 2,
p_attr_value => APEX_APPLICATION.G_F02(apex_application.G_F01(r))
end loop;
-- Report screen
select
APEX_ITEM.CHECKBOX(1,seq_id) SEQ_ID,
seq_id as seq_id_display
,C001 empno
,htmldb_item.text(02,c002,10,10) ename
,c003 job
,c004 manager
,to_date(c005,'DD-MON-YY') hiredate
,c006 SAl
,c007 com
,c008 dept
from apex_collections
where collection_name='TEST_EMP'
order by c001

Answer 1

For updating try the below code, pls let me know if it works.
Create a process which runs "on-submit before computation & validation".
declare
c pls_integer := 0;
begin
for c1 in(
select seq_id from apex_collections
where collection_name = 'TEST_EMP'
order by seq_id)
loop
c := c+1;
if apex_collection.collection_exists(p_collection_name => 'TEST_EMP') then
for i in 1..apex_application.g_f01.count
loop
APEX_COLLECTION.UPDATE_MEMBER(
p_collection_name => 'TEST_EMP',
p_seq => c1.seq_id,
p_c002 => nvl(apex_application.g_f02(c),''));
end loop;
end if;
end loop;
end;