![]() The following demo form is based on the sample Schema’s included with a standard installation of an Oracle database and uses the HR Schema and the DEPARTMENTS and EMPLOYEES tables mentioned previously. Now that you have a basic understanding of how the data loads into the tree, let’s build a form that uses a hierarchical tree. Notice how the Node_ID is incremented and how the children are linked to the parent through the PARENT_NODE_ID.Īll tree nodes must have a unique Parent and Child Node ID combination. Now, when we add the employees in each department to the tree watch how NODE_IDs change. For example If I load all of the rows from the HR.DEPARTMENTS table into a tree, the rows would be assigned as follows: Node_IDs are assigned sequentially, in that as a value is added to the tree, it is assigned the next available ID. This “How To” document will use the sample HR.DEPARTMENTS and HR.EMPLOYEES tables as the source tables for the tree.Įach value in a tree is assigned a unique node_id. As of the date of this publication, I am not aware of any limitations on the number of node depths you can go with Oracle HT. ![]() Think of it from the analogy of a Parent, Child and Grandchild. Children nodes can be parents themselves. A Hierarchical Tree (HT) can be thought of as a Master and Detail or Parent and Child(ren) relationship.Īn HT is made up of a root node, parent node and children node(s). The key to using this widget is to understand how to populate it with data. Oracle Forms Hierarchical Tree widget is one of the more complex widgets available in Oracle Forms.
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