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156c9b3036cca06ff87755086fddc6e8f82050f6 · developerworks · May 14, 2013 23:36

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+Closure Table
+=============
+
+This is a mysql store procedure and trigger implementation of closure table in RDBMS about hierarchy data model.
+
+Features
+--------
+
+* Automatically add new paths relationship information between ancester and descendant nodes when you insert node to table `prefix_nodes`
+* Automatically update(`DELETE` old paths and `INSERT` new paths) paths relationship information when you update the `parent_id` column of `prefix_nodes` table if the new value parent_id if different(This means move a node/subtree to a new parent node)
+* A store procedure that is used to select a whole subtree by a `node_id` (if the `node_id` has descendant)
+
+
+
+Triggers
+--------
+
+* `prefix_nodes_add_new_paths_after_insert`
+The trigger is execute when insert a node into `prefix_nodes` table, and call `p_prefix_nodes_add_new_paths_after_insert` to add new paths info.
+
+* `prefix_nodes_move_old_paths_after_update`:
+The trigger is execute when update the `parent_id` column of `prefix_nodes` table only if `OLD.parent_id != NEW.parent_id`
+
+Store Procedures
+----------------
+
+It's very clear of means just like the name of the procedures.
+
+* `p_prefix_nodes_add_new_paths_after_insert`
+* `_prefix_nodes_get_subtree_by_node_id`
+* `p_prefix_nodes_move_old_paths_after_update`