Fwd: Procedural Languages

---------- Forwarded message ----------
From: Michael Nolan <htfoot(at)gmail(dot)com>
Date: Thu, May 31, 2012 at 2:49 PM
Subject: Re: [GENERAL] Procedural Languages
To: Darren Duncan <darren(at)darrenduncan(dot)net>

On Thu, May 31, 2012 at 2:23 PM, Darren Duncan <darren(at)darrenduncan(dot)net>wrote:

> Michael Nolan wrote:
>
>> PL/pgSQL and PL/perlu are the only ones I use. I use PL/perlu primarily
>> to launch shell scripts from triggers, for example to update an external
>> website when a row in a table has been inserted, deleted or updated.
>>
>
> There is also another way to do what you describe that might be more
> secure.
>
> Rather than having the DBMS launch shell scripts directly, instead use
> LISTEN/NOTIFY messaging, where the trigger posts a message, and you have an
> ordinary client script listening for them, and the client script launches
> the shell scripts when it gets a message.
>
> This way, you need a persistent client script, but you don't need to
> invoke the shell in the DBMS ... or use the untrusted version of PL/Perl if
> that's all it was for.
>
> -- Darren Duncan
>

Anybody have examples of a persistent client script?
--
Mike Nolan