Cancel query based on a timeout

Hi List,

I'm running a query on a not-so-small db. Mostly this query runs fast enough, but every once in a while the query takes
along time to complete in wich case the users start banging away on the keyboard :-).  

What we would like to do is cancel the query after a certain time-out (e.g. 30 sec.)
Is there some way to send a command to the postgres sever to stop running the query?

We're using Postgres 7.3.4 and the latest ODBC driver. Programming is done with Borland Delphi 7


Regards,

Stijn Vanroye