Where clause with Bind Variable in ViewObject

Question

As per recomendations from Jdev team they say that using Bind varialbles in where clause will improve the performance (Option 1) But it is causing us to create more view objects.
Example : Lets say we have a View Object EmpVO
Option 1:
ViewObject vo=context.getViewObject("EmpVO");
vo.setWhereClause("EMPNO=?");
vo.setWhereClauseParam(0,st);
(or)
Option 2:
vo.setWhereClause("EMPNO="+st);
If we want to use same View Object "EmpVO" in another Action Class
ViewObject vo1=context.getViewObject("EmpVO");
vo1.setWhereClause("DEPTNO=?");
vo1.setWhereClauseParam(0,str);
It this case it throws an error saying BIND VARIABLE already exits. So we have to make another View Object.
Where as if we did not use bind variable but used Option 2 approach the same view object can be used in multiple pages.(at the expense of performance as per Jdev team)
Are we doing something wrong here or are there other ways to use the same view object when using bind variable in where clause.
Thanks

Answer 1

I haven't been using BC4J for a while, but I seem to recall that the recommendations are that you don't set the where clause at runtime: You're supposed to define your view with the bind parameter already in it.
So you'd probably define an EmpsForEmpNoVO and type "EMPNO = ?" in the where box. (There are other ways of finding a single row/entity and one of those may well be more efficient. Perhaps a better example of where you might want a view of employees is WHERE DEPTNO = ?.)
IIRC, all instances of a particular type of view share the same definition, so you have to be careful if you alter that at runtime. However, I think everything's set up so that you can have many different (and separate) resultsets for a single view (instance) - meaning that it's possible to "run" a view for (e.g.) two different ids. (It's definitely possible to create two different instances of a view from its definition - and the resultsets will definitely be separate then. I think there's a "create" method on the application module; I remember that "find..." always returns the same instance of the view.)
Hope that's a push in the right direction (since no-one else had replied - and I hope not too much has changed since 9.0.3)....
Mike.