Check for value with current_setting()

Question

I\'m trying to work with current_setting().

I came up with this:

CREATE OR REPLACE FUNCTION process_audit() RETURNS TRIGGER AS $audit$
    D         


        

Answer 1

9.6 and newer:

PostgreSQL (9.6+) supports current_setting('setting_name', 't') to fetch a setting and return NULL if it's unset. you can combine this with coalesce to supply a default.

9.5 and older:

Per the question, you can do it with a plpgsql function that uses a BEGIN ... EXCEPTION handler, if you don't mind the performance hit and clumsiness. But there's no built-in support.