Re: [HACKERS] executing OS programs from pg
Gevik babakhani wrote: Dear people, Does anyone know how to execute an OS command from pgsql. I would like to create a trigger that op on firing would run/execute an external program. Does such functionality exist or do I have to write my own trigger function in C. Reagrds, Gevik. Gevik, Do something like that ... CREATE OR REPLACE FUNCTION xclock() RETURNS int4 AS ' system(xclock); return 1; ' LANGUAGE 'plperlu'; This should be fairly easy to implement but recall - you cannot rollback xclock ;). best regards, hans -- Cybertec Geschwinde u Schoenig Schoengrabern 134, A-2020 Hollabrunn, Austria Tel: +43/664/393 39 74 www.cybertec.at, www.postgresql.at ---(end of broadcast)--- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
Re: [HACKERS] executing OS programs from pg
Try the PL/sh project on www.pgfoundry.org. Chris Gevik babakhani wrote: Dear people, Does anyone know how to execute an OS command from pgsql. I would like to create a trigger that op on firing would run/execute an external program. Does such functionality exist or do I have to write my own trigger function in C. Reagrds, Gevik. ---(end of broadcast)--- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq
Re: [HACKERS] executing OS programs from pg
Gevik babakhani [EMAIL PROTECTED] writes: Does anyone know how to execute an OS command from pgsql. I would like to create a trigger that op on firing would run/execute an external program. Use any of the untrusted PLs to execute system() or the like. Whether this is a good idea or not is a different question --- there are excellent reasons why it is a *bad* idea to execute outside-the-database actions from within a trigger. Mainly that the actions won't be undone if the transaction later rolls back, and now your database state is inconsistent with outside-the-database state. See the list archives for many past discussions of this point and safer ways to design your application. (BTW, this is hardly material for -hackers.) regards, tom lane ---(end of broadcast)--- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq
Re: [HACKERS] executing OS programs from pg
On Fri, Jun 03, 2005 at 20:56:44 +0200, Gevik babakhani [EMAIL PROTECTED] wrote: Dear people, Does anyone know how to execute an OS command from pgsql. I would like to create a trigger that op on firing would run/execute an external program. Does such functionality exist or do I have to write my own trigger function in C. You would have to write your own trigger, though you could use other languages than C (e.g. untrusted perl). Another option is to communicate with an external program using notify. ---(end of broadcast)--- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]
Re: [HACKERS] executing OS programs from pg
Look at peter eisentraut's procedural language PL/sh It's on pgfoundry. ... John -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tom Lane Sent: Saturday, June 04, 2005 5:16 AM To: Gevik babakhani Cc: pgsql-hackers@postgresql.org Subject: Re: [HACKERS] executing OS programs from pg Gevik babakhani [EMAIL PROTECTED] writes: Does anyone know how to execute an OS command from pgsql. I would like to create a trigger that op on firing would run/execute an external program. Use any of the untrusted PLs to execute system() or the like. Whether this is a good idea or not is a different question --- there are excellent reasons why it is a *bad* idea to execute outside-the-database actions from within a trigger. Mainly that the actions won't be undone if the transaction later rolls back, and now your database state is inconsistent with outside-the-database state. See the list archives for many past discussions of this point and safer ways to design your application. (BTW, this is hardly material for -hackers.) regards, tom lane ---(end of broadcast)--- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq ---(end of broadcast)--- TIP 4: Don't 'kill -9' the postmaster
