Operator does not exist: interval > integer

Operator does not exist: interval > integer

I have a query that works on Postgresql 7.4 but not on Postgresql 8.3 with same database.


SELECT * FROM login_session WHERE (now()-modified) > timeout; 

Gets the following error:

ERROR:  operator does not exist: interval > integer LINE 1: ...ELECT * FROM login_session WHERE (now()-modified) > timeout ...                                                              ^ HINT:  No operator matches the given name and argument type(s). You might need to add explicit type casts. 

Column modified is a timestamp and timeout is an integer.

Is there some settings I need to change on server?

I'm installing an application for a client on new server (ubuntu) so I can't change queries in the application.

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create or replace function int2interval (x integer) returns interval as $$ select $1*'1 sec'::interval $$ language sql; create cast (integer as interval) with function int2interval (integer) as implicit; 
ought to do it..
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There are a lot of changes between 7.4 and 8.3.

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I suppose the "timeout" is in seconds? If so you could change the query to:.
SELECT     * FROM     login_session WHERE     (CURRENT_TIMESTAMP - modified) > (timeout * '1 sec'::interval); 


CREATE OR REPLACE FUNCTION intToInterval(arg integer)   RETURNS interval AS $BODY$    BEGIN             return CAST( arg || ' seconds' AS interval );     END; $BODY$   LANGUAGE 'plpgsql';  CREATE CAST (integer AS interval) WITH FUNCTION intToInterval ( integer ) AS IMPLICIT; 
(Assuming timeout is measured in seconds - change accordingly otherwise).

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