You can do this by adding a trigger to your table. Just define the trigger
to be invoked on INSERT and UPDATE for your table. The trigger definition
would look something like this: [...]
Thanks. So far that works for one table.
Can I have this behaviour somehow inherited by child-tables ?
Like:
CREATE TABLE objects (
id integer primary key,
created_ts timestamp(0) DEFAULT LOCALTIMESTAMP,
update_ts timestamp(0),
deleted_ts timestamp(0), -- things get ignored in normal processing
...
);
Then create a trigger as in your example that updates this timestamp.
Every other table in the db would inherit (objects) to get those standard fields that I'd like to have everywhere. It'd be nice not having to bother about the "methods" of the objects-class for every child-class.
CREATE FUNCTION "public"."set_update_ts" () RETURNS trigger AS'
BEGIN
NEW.update_ts = NOW();
RETURN NEW;
END; 'LANGUAGE 'plpgsql' IMMUTABLE CALLED ON NULL INPUT SECURITY INVOKER;
I entered your code into psql and checked it afterwards with pgadmin3.
pgadmin shows some parts different to the code that I pushed through psql :
1) create OR REPLACE ...
2) immuntable; <-- End of line What does this part behind "immutable" do ?
Of course, this function would end up setting the update_ts to NOW() every
time you insert or update your table. And you could never set the value
to anything other than NOW() because your trigger would catch it and set it
back to NOW() again.
That is what I had in mind. I'd like to see when there was the last update to a record.
... Andreas
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