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Adjacency List Model

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  • westridge
    Re: Adjacency List Model

    Thank you Peter, this looks promising.
    The dbf is spot on for sure. Looking into the web portion now.

    Thanks again.

    Leave a comment:

  • Peter.Greulich
    Re: Adjacency List Model

    Not exactly sure what you are trying to accomplish?

    Is this relevant?

    Leave a comment:

  • westridge
    started a topic Adjacency List Model

    Adjacency List Model

    I am attempting to create a hierarchical structure that is dynamic within a single .dbf table. Visualize an organization chart that will allow an infinite number of nested nodes and you will have a good idea of what I am attempting to achieve.

    At the last node, I wish to input a value. There should be no values at any of the branch nodes, only at the final node. Therefore, once a node has a value, you cannot add another node.

    (First Record)
    Sub Organization
    Person; Salary _____

    (Second Record)
    Sub Organization
    Person; Salary _____

    Here is another representation:

    Possible Solution
    I have found two methods to achieve this flexibility. The first is to use the Adjacency List Model; the second is the Nested Set Model. The simpler Adjacency List should work, but I don't know how to create nested levels in either a desktop based browse or a web based grid component. I'm certain that Joe Celko could do this in SQL but how do I show the nested values via GUI in Alpha? My focus is to do this on the web.

    Adjacency List Model table design

    category_id | name | parent_category_id |

    2 | TELEVISIONS | 1 |
    3 | TUBE | 2 |
    4 | LCD | 2 |
    5 | PLASMA | 2 |
    7 | MP3 PLAYERS | 6 |
    8 | FLASH | 7 |
    9 | CD PLAYERS | 6 |
    10 | 2 WAY RADIOS | 6 |

    On the web, using the Grid Component Group breaks could work, but only to one (1) level, not N levels. The idea here is to have the depth of each node be variable. For example, There could be one org with only 3 Sub organizations, whereas as second organization could have 3 or more nodes as in the first example.

    I apologize for the abstract nature of my post, but know of no better way to ask the question.