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From: Dimitri Fontaine <dimitri@2ndQuadrant.fr>
To: Thom Brown <thom@linux.com>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Subject: Re: Event Triggers: adding information
Date: Tue, 22 Jan 2013 14:28:54 +0100
Message-ID: <m21uddjqi1.fsf@2ndQuadrant.fr> (raw)
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Thom Brown <thom@linux.com> writes:
> Would it be desirable to have ddl_command_success and
> ddl_command_failed events.  These would effectively be subsets to

No, because you can't run any SQL in a failed transaction.

> This, unfortunately, introducing awkwardness with the WHEN clause
> restriction which doesn't accommodate simple equality.  And looking at
> the IN part of the syntax, it looks awful: WHEN TAG IN ('DROP
> SEQUENCE' AND 'CREATE TABLE').

The syntax is using a comma, not an "AND", as seen in the tests:

    create event trigger regress_event_trigger2 on ddl_command_start
       when tag in ('create table', 'CREATE FUNCTION')
       execute procedure test_event_trigger();
  
> So note that I'm coming into this syntax kinda fresh, so just giving
> first impressions of the current implementation.

Thanks for that, I'm all for getting something better at the end!

Regards,
-- 
Dimitri Fontaine
http://2ndQuadrant.fr     PostgreSQL : Expertise, Formation et Support


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