Jules Alberts wrote:
> Hello all,
>
> I'm working on a pg database that should be able to run commands on
> certain conditions. E.g. whenever a date is stored in column X of
> table Y, an email should be sent to user Z. Creating a triggered
> function is easy enough but how do I invoke the command? Also, I want
> to use variables in the executed command, something like:
>
> m_address := ''me(at)myself(dot)org'';
> m_subject := ''this is a test'';
> runcommand(''mail -s '' + m_subject + m_address);
>
> I guess the answer is very obvious, but I couldn't find it. TIA for
> any help!
>
> --
> Jules Alberts.
>
You can't do this from pl/pgsql, or any other truted language, thats what
the trusted part is about - not giving access to the rest of the system. I
believe Peter E wrote something called pl/sh which gives shell access
(search the archives for an address), or if that doesn't fit you're bill do
a little C (PerlU + other untrusted languages can probably do this as well,
but not tried). To make a C function easier, write the trigger function in
plpgsql, and then have a mailer function to accept the necessary arguments
then do a system command.
hth,
- Stuart