Using PPR in PL/SQL generated webpages

Question

I have a question about using PPR with web pages written in PL/SQL.
I have a dropdown menu that I want to limit by the value selected in the preceding dropdown (pick-list).
So far I have not found much information on PPR other than on OTN, and was unable to find any PL/SQL coding samples; so I guess I should ask...
    - Is it possible to use PPR in a webpage generated from a stored PL/SQL procedure/package?
    - If so, how do I make use of PPR in PL/SQL?
    - If it is NOT possible to use PPR with PL/SQL, what other methods could I make use of other than JavaScript?
Thank you in advance,
Charlie

Answer 1

When I run the following script, the 2nd time the test1 procedure runs, it fails with "PLS-00905: object TEST1 is invalid", whereas test2 runs fine both times.
Feel free to try it yourself!
create table boneist_test (col1 number, col2 varchar2(10));
insert into boneist_test values (1, 'a');
commit;
create procedure test1
is
  v_num number;
  v_var varchar2(10);
begin
  select *
  into v_num, v_var
  from boneist_test
  where rownum = 1;
end test1;
create procedure test2
is
  v_num number;
  v_var varchar2(10);
begin
  select col1, col2
  into v_num, v_var
  from boneist_test
  where rownum = 1;
end test2;
begin
  test1;
end;
begin
  test2;
end;
alter table boneist_test add (col3 number);
begin
  test1;
end;
begin
  test2;
end;
drop table boneist_test;
drop procedure test1;
drop procedure test2;