Database driven folder tree

[Anon]

I am looking for some examples of a Windows Explorer style folder tree that is database driven.

the database has
folder_id, parent_id and name for columns.

there are lots of examples around, but none really work if the tree is from a database - They fall apart when the parent_id < folder_id.

are there any robust examples or sample code that will work if parent_id < folder_id.

thanks