On 10/15/2012 08:54 PM, P. Broennimann wrote:
Hi there 1) Can a Pg/SQL function "listen" for a notification sent from an external instance?
No, it's the other way around. A client can `LISTEN` for a `NOTIFY` sent by another client, either directly or via a PL/PgSQL function.
What you want is a NOTIFY callback or NOTIFY trigger, something that invokes a function without any client action when a NOTIFY comes in. No such feature exists.
I would like my stored function to pause/wait and continue its execution once an external event (NOTIFY event) occurs.
Use an advisory lock, they're ideal for that job: http://www.postgresql.org/docs/current/static/explicit-locking.html#ADVISORY-LOCKS
2) In Pg/SQL I can implement a loop (until something happens) to pause/wait. This costs CPU time -> Is there another solution?
Depends on what you're waiting for. Details? Again, an advisory lock may be a candidate. -- Craig Ringer -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
