---------- Forwarded message ---------- From: Michael Nolan <htf...@gmail.com> Date: Thu, May 31, 2012 at 2:49 PM Subject: Re: [GENERAL] Procedural Languages To: Darren Duncan <dar...@darrenduncan.net>
On Thu, May 31, 2012 at 2:23 PM, Darren Duncan <dar...@darrenduncan.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
