how to know when a table is altered

From: "Vincenzo Passoli" <maweb(at)hotmail(dot)com>
To: pgsql-sql(at)postgresql(dot)org
Subject: how to know when a table is altered
Date: 2000-06-07 05:24:17
Message-ID: 20000607122417.68160.qmail@hotmail.com
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i'm developing a framework (mod_perl+apache) that reads the db-schema and
explode html forms.

now i read the schema and cache it into perl-hashes to speedup things.

my problem is to recognise when a table is altered so that the framework can
update the related forms connected to the db tables.
i don't want to read the schema every time.

How can i implement this ?

thank you in advance for your help
valter, italy
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