Re: Triggers on columns

On Thu, Sep 03, 2009 at 10:52:09AM +0900, Itagaki Takahiro wrote:
> Here is a patch to implement "Support triggers on columns" in our ToDo list.
>
> The syntax is:
> CREATE TRIGGER name
> BEFORE UPDATE OF col1, col12, ...
> ON tbl FOR EACH ROW EXECUTE PROCEDURE func();

Kudos!

>
> I consulted the previous work following:
> Column-level triggers (From: Greg Sabino Mullane, Date: 2005-07-04)
> http://archives.postgresql.org/pgsql-patches/2005-07/msg00107.php
> and completed some under-construction parts.
>
> It's still arguable that we should add dependencies from column
> triggers to referenced columns.

+1 for adding the dependencies.

Cheers,
David.
> In the present patch, dropeed
> columns are just ignored and always considered as not-modified.
> Please grep with "TODO: (TRIGGER)" to check the issue.
>
> Comments welcome.
>
> Regards,
> ---
> ITAGAKI Takahiro
> NTT Open Source Software Center

>
> --
> Sent via pgsql-hackers mailing list (pgsql-hackers(at)postgresql(dot)org)
> To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-hackers

--
David Fetter <david(at)fetter(dot)org> http://fetter.org/
Phone: +1 415 235 3778 AIM: dfetter666 Yahoo!: dfetter
Skype: davidfetter XMPP: david(dot)fetter(at)gmail(dot)com

Remember to vote!
Consider donating to Postgres: http://www.postgresql.org/about/donate