Second list depending on first on when-list-changed

Question

Hello!
I'm having some trouble with 2 poplists. First poplist (:bloc_portar.lista) is generated ok. Second poplist (:bloc_portar.cnp) depends on the values of the first like this:
DECLARE
     nume_lista1 varchar2(60) := replace(:bloc_portar.lista, ' ', NULL);
     nume_lista2 varchar2(60);
     rg_query_cnp varchar2(1000) := 'SELECT b.id, b.id FROM vizitatori2 b
     WHERE b.nume=nume_lista2';
     rg_id_cnp recordgroup;
     rg_id2 recordgroup;
     err_cnp NUMBER:= 0;
BEGIN
nume_lista2 := substr(nume_lista1, 1, 7);
message('---' || nume_lista2 || '---');
     rg_id2 := Find_Group ('rg2');
     if not ID_NULL(rg_id2) then
     delete_group(rg_id2);
     end if;
     rg_id_cnp := create_group_from_query('rg2',rg_query_cnp);
     err_cnp := populate_group(rg_id_cnp);
     clear_list('bloc_portar.cnp');
     populate_list('bloc_portar.cnp',rg_id_cnp);
END;
nume_lista1 fetches the data selected from the first poplist and nume_lista2 takes the first 7 letters of that string to pass it in the query which should make the group/populate the second list. This code is more of a test and not a final code thats why i used those string functions (and also because the values in first list are concatenated (name+surname).
I used a message to make sure the value in nume_lista2 is the one that i want for the query to work.
The problem : its in here 'SELECT b.id, b.id FROM vizitatori2 b WHERE b.nume=nume_lista2';
I've found out that when i pass the WHERE condition "manually" like this 'SELECT b.id, b.id FROM vizitatori2 b WHERE b.nume=''James'' ';
the second poplist is populated just fine with the right values. But when i try to make it use the variable nume_lista2 in the condition it says that rg2 (aka the group for the second poplist) "Cannot create Group rg2".
Hope you can help me,
Iulian

Answer 1

But can u enlighten me on a couple of issues pls?Sure :)
>
1. How come it doesn't recognise the variable in the query when i make the definition in DECLARE? Shouldn't it be analyzed only later in the main program when i actually use the query ? How does this work?You can do that in declare part too :). I am usually convenient to have a query built just before using it.
2. Why tripple quotes and concatenate operators ? Is this how variables are passed to queries? I believe i used them before without any extra bording or anything.varchar2 variables are not passed with quotes by default. So, if you do not use the quotes, the resultant query would be something like
SELECT b.id, b.id FROM vizitatori2 b WHERE b.nume=Jameswhich is not what we expect. So, surround the variable with the quote, which would turn the query to
SELECT b.id, b.id FROM vizitatori2 b WHERE b.nume='James'HTH.
-Arun