How to implement Master-Detail Search in TopLink without using DataControl

Question

Hi,
I am using TopLink and EJB in our requirement. But we are not creating any data controls. Without data controls how to implement master detail search using TopLink and EJB. I did search for a single table. It is working fine. The way i implented is as follows.
1) Taking search parameter from UI and passing it to A delegator class's method.
2) Delegator class's method calls the EJB's NamedQuery which i already created using expression builder.
3) EJB executes the NamedQuery with the parameter we are passing. And it returns the results back to UI.
But as i am new to TopLink, can anyone tell me the procedure to implement Master - Detail search. Here we need to search based on Master table's column.
Waiting for the replies regarding this.
Thanks & Regards,
Suresh Kethireddy

Answer 1

Hi,
I did it successfully. Following is the code.
Session session = getSessionFactory().acquireSession();
UnitOfWork uow = session.acquireUnitOfWork();
ReadAllQuery raq = new ReadAllQuery();
Dept d = new Dept();
d.setLoc(loc);
raq.setExampleObject(d);
List<Dept> res=(List<Dept>)uow.executeQuery(raq);
for(int i=0; i<res.size();i++){
System.out.println("Dept DeptNo ---"+res.get(i).getDeptno());
System.out.println("Dept DeptName ---"+res.get(i).getDname());
System.out.println("Dept Location ---"+res.get(i).getLoc());
List<Emp> eRes=res.get(i).getEmpCollection();
for(int j=0; j<eRes.size();j++){
System.out.println(" Emp No ---"+eRes.get(j).getEmpno());
System.out.println(" Emp Name ---"+eRes.get(j).getEname());
System.out.println("Emp HireDate ---"+eRes.get(j).getHiredate());
System.out.println(" Emp Job ---"+eRes.get(j).getJob());
System.out.println(" Emp Mgr ---"+eRes.get(j).getMgr());
System.out.println(" Emp Sal ---"+eRes.get(j).getSal());
But now my question is, i want to search by providing Dept param as well Emp(Which is child table) param also. Is it possible?
I tried in 2 ways like this.
1) Emp emp = new Emp();
emp.setEname(eName);
dept.addEmp(emp);
raq.setExampleObject(dept);
2) Emp e = new Emp();
e.setEname("ADAMS");
List<Emp> list = new ArrayList();
list.add(e);
d.setEmpCollection(list);
raq.setExampleObject(d);
But in both cases i failed to search based on the values i am passing to Emp.
Is there any other way to achieve my requirement?
Any help on this is great.
Thanks & Regards,
Suresh K