How to built a dynamic string PLSQL - oracle

Question

I have 2 associative_arrays of number and I am trying to built a dynamic string for a dynamic query.
This is my for statement:
for indx_opt in 1..IDOPTarray.count loop
IF indx_opt=1 AND IDFGCFCParray.count=1 THEN
sql_stmt_2:=sql_stmt_2||' and wopt.id_ft_opt = ';
sql_stmt_2:=sql_stmt_2|| (IDOPTarray(indx_opt));
end if;
if indx_opt=1 AND IDFGCFCParray.count>1 then
sql_stmt_2:=sql_stmt_2||' and wopt.id_ft_opt in(';
sql_stmt_2:=sql_stmt_2||(IDOPTarray(indx_opt));
elsif indx_opt>=1 AND IDFGCFCParray.count>=0 then
sql_stmt_2:=sql_stmt_2||','||(IDOPTarray(indx_opt))||')';
With 2 number in IDOPTarray I get a correct result:
and wopt.id_ft_opt in(27,28)
Instead with more then 2 number in IDOPTarray I get this result:
,17228),17229),17230)
What I want to get is this:
where w.id = 303 and wopt.id_ft_opt in (17228,17229,17230)
if I have 5 numbers, I want to get this for the 'where' clause:
where w.id = 321 and wopt.id_ft_opt in (17228,17229,17230,17231,17232)
I want a dynamic output of my string.
IDFGCFCParray is the 2nd array, but is not important right now in order to get the output I want.
Does somebody can help me? thank you.

Answer 1

You have to close bracket only if indx_opt is equil to IDOPTarray.count.
And simple example.
declare
type list_number is table of number;
xx list_number := new list_number(1,2,3,5,7,8);
str varchar2(4000);
begin
for i in xx.first .. xx.last loop
if i = 1 then
str := ' condition in ('||xx(i);
else
str := str||','||xx(i);
end if;
if i = xx.last then
str := str||')';
end if;
end loop;
dbms_output.put_line(str);
end;
If you colleciton is sql levle type you can do this in this way
declare
xx list_number := new list_number(1,2,3,5,7,8);
str varchar2(4000);
begin
SELECT 'condition in ('||LISTAGG(column_value, ',') WITHIN GROUP (ORDER BY column_value)||')' into str from table(xx);
dbms_output.put_line(str);
end;