View Object New Attribute Setting Expression

Question

I am trying to create a new attribute in a View Object. I wish to have the attribute contain some strings and fields (like dashes between other fields).
Simple concatenation works fine:
YEAR||SEQ||TYPE -- this works!
When I try to add the dash using the wizard like this:
YEAR||'-'||SEQ
I get an error in the SQL query and the following appears in the view.xml file:
YEAR||#39;-#39;||SEQ -- left out & so the #39 would post
I am considering creating an new table in Oracle, but this would be easier if it is possible.
I am using JDeveloper 9.0.3 and Oracle 9iAS on Windows 2000.
I have tried several ways to get the dash in the new attribute like "-", but the wizard will not cooperate and editing the file directly didn't work either.
Any ideas would be appreciated.

Answer 1

Hi Timo,
Thank you very much for the explanation and direction. I will do that way. I have found that implementing view object and view row class I could do the similar kind of thing for the transient attribute.
public Number getTotalPoints() {   
RowIterator con= getConnectionViewImpl();
   Number sum = new Number(0);
   while (con.hasNext()) {     
      sum = sum.add( (Number)con.next().getAttribute("Points"));
    }    return sum;
  } took form
http://technology.amis.nl/blog/1295/creating-a-dynamic-ajax-column-footer-summary-in-a-table-component-using-adf-faces
But it also slow as 1 st method
I am wonder whether both ways behave as similarly or they are totally different implementation?