Detecting column changes in a postgres update trigger

Question

I have a postgres database with several tables that I want to watch for updates on, and if there\'s any updates, I want to fire a \"hey, something changed\" update. This wor

Answer 1

http://www.postgresql.org/docs/9.3/static/plpython-trigger.html

TD["table_name"]

I do exactly the same type of notify, I loop through all of the columns like this:

    for k in TD["new"]:
        if TD["old"][k] != TD["new"][k]:
            changed.append(k)

changed.append(k) builds my notification string. Somewhere else I do a listen, then broadcast the results out pub/sub to web socket clients.

-g