Filter Records in WHERE clause iReports using values passed from a prgram

Question

I have searched for iReports manual and what i can see are docs on sale. I have managed to create jrxml file, execute it in jsp and actually view the report.
Now i have a big list of customers from various branches and have various categories. I would like to know how to pass the parameters so that i retrieve a small list of items. e.g. WHERE cu.branch=200 AND cu.category=10. That is i would like to pass 20 and 10 to the jrxml query stored.
In iReports i saw parameters, variables and fields but it seems like these are displayable fields.
How will i achieve this. Am seeking for assistance.
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Answer 1

>
Please help me to use an associate array in SQL query (WHERE clause).
select *
bulk collect into some_array
>
there is no variable 'some_array' in what you posted.
If you want help with your code you have to post the code you are really using, not some hacked-up version of it that has errors.
Here is sample code that shows how to treat a collection as a table using the TABLE operator
-- type to match emp record
create or replace type emp_scalar_type as object
  (EMPNO NUMBER(4) ,
   ENAME VARCHAR2(10),
   JOB VARCHAR2(9),
   MGR NUMBER(4),
   HIREDATE DATE,
   SAL NUMBER(7, 2),
   COMM NUMBER(7, 2),
   DEPTNO NUMBER(2)
-- table of emp records
create or replace type emp_table_type as table of emp_scalar_type
declare
tb emp_table_type;
deptnoList sys.OdciNumberList;
BEGIN
select emp_scalar_type(empno, ename, job, mgr, hiredate, sal, comm, deptno)
bulk collect into tb from emp;
SELECT deptno bulk collect
INTO deptnoList
FROM dept where deptno not in (select deptno from table(tb));
for i in 1..deptnoList.count loop
dbms_output.put_Line(deptnoList(i));
end loop;
END;Note that tb is a collection and is useds in the subquery 'select deptno from table(tb)'.