Re: Update counter when row SELECT'd ... ?

> I have a simple table:
> 
> name, url, counter
> 
> I want to be able to do:
> 
> SELECT * FROM table ORDER BY counter limit 5;
> 
> But, I want counter to be incremented by 1 *if* the row is included in
> that 5 ... so that those 5 basically move to the bottom of the list, and
> the next 5 come up ...
> 
> I've checked CREATE TRIGGER, and that doesn't work 'ON SELECT' ... is
> there anything that I *can* do, other then fire back an UPDATE based on
> the records I've received?
> 
> Thanks ...
> 

You mean that you want to write a SELECT statement that returns the 5 first rows that have the smallest counter, and
justafter what, you would like to increment their counter, right?
 

I was thinking of using a table function, something like (I didn't test it):

CREATE OR REPLACE FUNCTION my_first_url(P_Limit IN int) RETURNS SETOF table
AS $$
BEGIN FOR V_Record IN   SELECT *     FROM table     ORDER BY counter     LIMIT P_Limit LOOP   UPDATE table      SET
counter= counter + 1     WHERE name = V_Record.name      /* AND url = V_Record.url */; -- if needed
 
   RETURN V_Record; END LOOP;
END;
$$ LANGUAGE PLPGSQL;


--
Daniel