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Tree storage and node selection using path
I'm trying to find ideal solution to store a tree structure. Each node has a name. Constraint is that there may not be two same named nodes having same parent. Is it possible to select node using path to node(?) - /a/b/c will select node named 'c' that is children of node named 'b' that is chilren of node named 'a';
I have found two solutions on this topic - adjacency list, nested sets. But don't know if it's possible to perform selection using path to node like described above.
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by: NovaDenizenPosted on 2005-03-17 at 07:16:49ID: 13565620
One way to jump straight to a node is to store the full path to the node in each node. i.e. Every node contains a path varchar, nodename varchar and you make an index on (path, nodename).
If that path varchar takes up more space than you're willing to use, you could instead store a hash of the path in each node. Each node would contain a pathhash bigint, and a nodename varchar and you make an index on (pathhash, nodename). The problem with this approach is that you will occasionally (but not very often) have a hash collision and the query will return more than one node. In this rare case you would have to do it manually the normal way.