How to handle multiple database tables in a single UIX page?

Question

Hi,
I am new to UIX & BC4J. I have to handle data from four different tables in the database. The scenario is as follows:
The tables are
1. user
fields are: userid number, name varchar2
2. business
fields are: businessId number, name varchar2
3. service
fields are: serviceId number, serviceName varchar2
4. userBusiness
userid,businessid (both are foreign keys) & form complex primary keys.
and userid,businessid, serviceId are primary keys.
Now my problem is: to create a webpage where
1. The userid is available in the httpSession Variable as string.
2. according to the userId stored in the session variable I have to retrieve the business names and show them in a choice i.e., pull down box.
3. I have to show the services provided by the business for the business name selected in the combo box.
Could anyone Please help me solve this problem? Could you please give me hints? I have truncated the other fields in the tables.
Thanking you,
Velpandian .S

Answer 1

At the moment, you can't do it declaratively. You have to do it in an event handler. Assuming you have the userid setup as a query parameter in the view object, something like this should get you started:
public EventResult handleEvent(
BajaContext context, Page page, PageEvent event) throws Throwable
HttpSession session = context.getServletRequest().getSession(true);
ViewObject view = ServletBindingUtils.getViewObject(context);
String userid = session.getAttribute("userid");
view.setWhereClauseParam(0, userid);
view.executeQuery();