generating a parent/child relationship in a trigger

From: Mark Harrison <mh(at)pixar(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: generating a parent/child relationship in a trigger
Date: 2005-04-12 17:51:51
Message-ID: 425C0AB7.6050905@pixar.com
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Suppose I'm adding row to a table, and one of the columns is
a pathname.

I would like to generate in a separate table parent/child
relationships based on the path.

For example, adding "/foo/bar/baz" and "/foo/bar/bot" would
generate the following relationships

parent child
------ -----
/foo /foo/bar
/foo/bar /foo/bar/baz
/foo/bar /foo/bar/bot

Is this a reasonable thing to do in a trigger? Does anybody
have a pl/sql snippet to do this?

Many TIA,
Mark

--
Mark Harrison
Pixar Animation Studios

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