Re: Trigger vs Rule

On 2 apr 2006, at 23.08, Niklas Johansson wrote:

> CREATE OR REPLACE FUNCTION exec_device_type() RETURNS trigger AS $$
> EXECUTE "SELECT device_type" || OLD.type || "(OLD.id)";
> $$ LANGUAGE plpgsql;

Sorry, I was bitten by the bedbug there: a plpgsql function needs a
little more than that to be functional :)

CREATE OR REPLACE FUNCTION exec_device_type() RETURNS trigger AS $$
BEGIN
EXECUTE 'SELECT device_type' || OLD.type || '(OLD.id)';
RETURN NEW/OLD/NULL; -- Depending on your application.
END;
$$ LANGUAGE plpgsql;

But really, you should consider reworking your schema structure.
Having a thousand functions doing almost the same thing is neither
efficient, nor maintainable.

Sincerely,

Niklas Johansson