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triggers on prepare, commit, rollback... ?

From: Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr>
To: PostgreSQL Developers <pgsql-hackers(at)postgresql(dot)org>
Subject: triggers on prepare, commit, rollback... ?
Date: 2008-05-19 09:42:24
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Lists: pgsql-hackers
Dear pgdev,

I've played with triggers a bit, and I have noticed that there seem to be 
no way to add a trigger on events such as "prepare", "commit", "rollback", 
"savepoint", if I'm not mistaken. Also, possible interesting events could 
be "create", "alter" and so, but it may already be possible to catch these 
by having a trigger on "pg_class" or the like.

It seems to me that such triggers would be useful to help implement a 
"simple" (hmmm...) synchroneous replication system, possibly by extending 
or modifying slony, or for advance logging.

Is there any special semantical issue for providing them in pg, or is it 
just the matter of implementing the parser, bookkeeping, callbacks... but 
with no other special "intrinsic" difficulty?

Thanks in advance,



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