Hi Craig Thanks for this I will give it a go later and see if this helps.
David ----- Original Message ---- From: Craig L Russell <[EMAIL PROTECTED]> To: [email protected] Sent: Tuesday, 22 January, 2008 12:39:31 AM Subject: Re: Understanding getResultList() Hi David, On Jan 21, 2008, at 3:34 PM, David Beer wrote: > Hi All > > I have a n issue with using Query getResultList(), I am executing a > nativeQuery("SELECT * FROM ENTRY", Entry.class). And performing the > query like so List<Entry> results = > (List<Entry>)query.getResultList(); and in return I am seeing a list > containing a delegate and a persistence object. > > My main problem is that I am trying to display the resulting data > that comes back in a JList, in order to set the list data on a JList > you have to have the data in a Vector. So when I tried to cast the > List to a Vector I got an exception. You might be better off creating a trivial implementation of a ListModel instead of using Vector (which is so last year). JList(ListModel dataModel) Constructs a JList that displays elements from the specified, non-null, model. Since there is no change possible to the underlying List, you just need to implement the getElementAt method and delegate to the underlying List. Object getElementAt(int index) Returns the value at the specified index. JList myJList = new JList( new MyListModel (listReturnedFromQuery)); class MyListModel{ List myList; MyListModel(List underlying) {myList = underlying;} void addListDataListener(ListDataListener l) {throw NotImplementedException;} void removeListDataListener(ListDataListener l) {throw NotImplementedException;} Object getElementAt(int index) {return myList.get(index);} int getSize() {return myList.size();} } Craig > > > When I perform the same query using TopLink I get back a list of > Objects of the type and no extra information. At the moment I am > going through the results and getting each Object element and adding > to Vector to display. This is fine with a small amount of records > but what about a large amount of records. Creating your own ListModel will also address this issue. Craig > > > What is the best way of getting back just a list of Objects no > additional data? > > Thanks > > David Craig Russell Architect, Sun Java Enterprise System http://java.sun.com/products/jdo 408 276-5638 mailto:[EMAIL PROTECTED] P.S. A good JDO? O, Gasp!
