Change the value of a variable used in a View query

Question

I am using JDeveloper 11g to develop a simple portlet application which displays data loaded from database. I am displaying the data by dragging the ViewObject from the AppModuleDataControl to the View.jspx page and selecting the option ADF Read-only Table. My ViewObject has a single variable :empId. Now is it possible to change the value of this variable with a value that comes from the request object. On the internet I found the following code:
        FacesContext facesContext = FacesContext.getCurrentInstance();
        Application app = facesContext.getApplication();
        ExpressionFactory elFactory = app.getExpressionFactory();
        ELContext elContext = facesContext.getELContext();
        ValueExpression valueExp =
        elFactory.createValueExpression(elContext, "#{data.AppModuleDataControl.dataProvider}",
        Object.class);
        ApplicationModule am = (ApplicationModule)valueExp.getValue(elContext);
        ViewObject emplVO;
        emplVO = am.findViewObject("EmployeeView1");
        emplVO.setNamedWhereClauseParam("empId", "1");I have put this code in the public void processAction(ActionRequest request, ActionResponse response) method. However this does not work when I deploy it.
Does anyone know if the above code is correct in this case and if there is a better way how I can set this up?

Answer 1

Hi there:
Did you add a break point and debug the code to see what is the value for the :empid parameters passed in to your view object?
If you are sure you have passed in the correct value for ":empid" parameter, then do the following:
String amDef = "yourAmDef";
String config = "yourConfig";
ApplicationModule am =
Configuration.createRootApplicationModule(amDef,config);
ViewObject emplVO;
emplVO = am.findViewObject("EmployeeView1");
emplVO.setNamedWhereClauseParam("empId", "1");
empVO.executeQuery();
which will execute your view object with the new bind variable value and refresh the view.
Please mark my answer as 'Correct' if it solves your problem, or 'Helpful' if it does.
Thanks,
Alex
Edited by: Alexbie on 27-Aug-2010 8:52 AM