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How to retrieve parents node by level in a tree

Contents

Objective

In a tree, from a node, retrieve the node's parent in the level indicated.

Recommended articles

In Openbravo ERP you can create a tree structure to use in a custom window

Execution Steps

There are two database functions:

input params: ad_tree_id (VARCHAR(32)), node_id (VARCHAR(32)), level (NUMERIC)
output: node (VARCHAR(32))
This function returns one parent of the node. This parent is in the level indicated, where the level 0 is the first node of tree, in level 1 are the sons of this first node, etc...

input params: ad_tree_id (VARCHAR(32)), node_id (VARCHAR(32))
output: level (NUMERIC)
Returns the level of the node in the tree, where the level 0 is the first node of tree, in level 1 are the sons of this first node, etc...

The projects can be managed in a tree. So, you can group the projects in differents levels, allowing obtain info by level In this case, the nodes in first level are the main projects, and the projects in second level, are the secundary projects. The normal projects (leaf nodes) belong to a main project and a secundary project. The revenues and expenses are reported to the normal project (leaf nodes), and you can obtain information in the level of parent nodes. One example is represented in picture.

tree T: TreeFunctions.jpg

AD_GET_NODE_TREE_BYLEVEL ('T', 'E', 1) -> 'C'
AD_GET_NODE_TREE_BYLEVEL ('T', 'E', 0) -> 'A'
AD_GET_LEVEL_NODE_TREE ('T', 'B') -> 1
AD_GET_LEVEL_NODE_TREE ('T', 'D') -> 2

Sometimes, it is interesting to know what is the main and secundary project of a project.

Result

The functions return the ID of parent node in level indicated, and the level of the node in the tree.

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