Обсуждение: Trigger email?

Is it possible to setup a trigger so that every time a
certain field is changed, an email is sent? Using
pl/pgsql.

Thanks,
CSN




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cool_screen_name90001@yahoo.com (CSN) writes:
> Is it possible to setup a trigger so that every time a
> certain field is changed, an email is sent? Using
> pl/pgsql.

Something _like_ that is possible.

What I would do instead is for the trigger to cause a record to be put
into a table that might be called something like "submit_email".

An asynchronous process (that might look for NOTIFY requests!) would
then rummage thru submit_email to find messages it needs to send.

That allows you to keep this sort of thing under some degree of
control.

- It means you're not concurrently spawning 157 MTA connections; the
  "mail manager" only needs to open _one_ connection

- It means you have some ability to manage how much mail gets sent out
  at once.
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Christopher Browne wrote:

>cool_screen_name90001@yahoo.com (CSN) writes:
>
>
>>Is it possible to setup a trigger so that every time a
>>certain field is changed, an email is sent? Using
>>pl/pgsql.
>>
>>
>
>Something _like_ that is possible.
>
>
you can also do it directly with a trigger if you prefer:

CREATE TRIGGER alert_insert
    AFTER INSERT OR UPDATE ON alert FOR EACH ROW
    EXECUTE PROCEDURE alert_notify();

Where the alert_notify() function would then call pgmail() with a
meaningful subject and body etc -- see below

>What I would do instead is for the trigger to cause a record to be put
>into a table that might be called something like "submit_email".
>
>An asynchronous process (that might look for NOTIFY requests!) would
>then rummage thru submit_email to find messages it needs to send.
>
>
at which point you could then use pgmail() to send the email

http://sourceforge.net/projects/pgmail/