Oracle JHeadstart Developer's Guide - Downloads - Oracle

Generating a tree for such a situation is only slightly different. The steps of section 5.6.1
Generating a Basic Tree are applicable to this situation, though with minor changes. The
step numbers here are variations of the basic tree steps with the same number.
1. You need the self-referencing foreign key as a View Link in your ADF Business
Components. The wizard ‘New Business Components from Tables’ will
automatically create such a View Link if a self-referencing foreign key is present
in the database.
2. In the data model of the Application Module, it is sufficient to have only one
level to generate a tree with an unlimited level of nesting. For example, to have a
tree with unlimited recursion on Employees, you only need this data model:
3. For this one-level data model it is not strictly necessary to also create a TreeSelect
usage, but it is a good habit and might become necessary when the tree is
extended.
4. You only need one group in your Application Definition for the self-referencing
View Object (similar to the hierarchy in the Application Module data model).
5. Change the Layout Style property of this group to 'tree-form'.
6. Change the Tree Data Collection to be the same as the original Data Collection
property (this usage is for showing the hierarchy of tree nodes), and change the
Data Collection property to the Tree Selection usage of that view (for example
EmployeesViewTreeSelect).
7. Select the right Descriptor Item.
8. If desired set the Show Tree Expanded? property
JHeadstart Developer’s Guide Generating Page Layouts 5 - 31