On Sat, Feb 20, 2016 at 2:00 PM, Filip Rembiałkowski <filip.rembialkow...@gmail.com> wrote: > I was stuck because both syntaxes have their ugliness. NOTIFY allows the > payload to be NULL: > NOTIFY chan01; > > How would this look like in "never" mode? > NOTIFY chan01, NULL, 'never'; -- seems very cryptic.
The docs say: "The information passed to the client for a notification event includes the notification channel name, the notifying session's server process PID, and the payload string, which is an empty string if it has not been specified." So a missing payload is not a SQL NULL but an empty string. This means you would have: NOTIFY chan01; NOTIFY chan01, ''; -- same as above NOTIFY chan01, '', 'maybe'; -- same as above NOTIFY chan01, '', 'never'; -- send this all the time Seems ok to me. -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers