Tree::Persist::DB::SelfReferential - a handler for Tree persistence
Please see Tree::Persist for how to use this module.
This module is a plugin for Tree::Persist to store a Tree to a self-referential DB table. This is where a table contains an id column for the row and a parent_id column that refers back to another row's id (which is the parent row).
This is the simplest way to store a tree datastructure in a database.
In addition to any parameters required by its parent Tree::Persist::DB, the following parameters are required by connect():
id (required)
This is the id for the root node of the tree. By specifying this, you can both store more that one tree in a table as well as only load a subtree.
id_col (optional)
This is the column name for the id field. It defaults to "id".
parent_id_col (optional)
This is the column name for the parent_id field. It defaults to "parent_id".
value_col (optional)
This is the column name for the value field. It defaults to "value".
class_col (optional)
This is the column name for the class field. It defaults to "class".
To date, only MySQL has been tested.
Provide for a way to default the class to 'Tree' if no class_col is provided. Also, allow for the classname to be passed into the constructor.
Please see the relevant sections of Forest.
Rob Kinyon <rob.kinyon@iinteractive.com>
Stevan Little <stevan.little@iinteractive.com>
Thanks to Infinity Interactive for generously donating our time.
Copyright 2004, 2005 by Infinity Interactive, Inc.
http://www.iinteractive.com
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
To install Forest, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Forest
CPAN shell
perl -MCPAN -e shell install Forest
For more information on module installation, please visit the detailed CPAN module installation guide.