I'm building a tree structured Object model. I.o.w. there a single POJO
(ResourceEJB) with a parent reference (Many to One) and a collection of child
references (One to Many) which are of the same type.
I have a method which determines all ResourceEJB object that share a certain
ResourceEJB parent:
| public Collection<ResourceEJB>
| findByParentID(Long aParentID)
| throws DAOException
| {
| try
| {
| ResourceEJB myParent = null;
| if(aParentID != null)
| myParent = (ResourceEJB)findByID(aParentID);
|
| return theManager.createQuery(
| "from ResourceEJB resource where resource.parent = :parent")
| .setParameter("parent", myParent).getResultList();
| }
| catch(Exception anException)
| {
| throw new DAOException(anException);
| }
| }
|
The problem is that I can't find the 'root' Node, which has a parent value of
'null'. How can I retrieve an Object using EJB-QL on a parameter which has a
null value?
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