annotate demo/roundTrip.ur @ 712:915ec60592d4

More flexible foreign keying
author Adam Chlipala <adamc@hcoop.net>
date Thu, 09 Apr 2009 13:59:34 -0400
parents 1a317a707d71
children 15ddd64a5113
rev   line source
adamc@698 1 table channels : { Client : client, Channel : channel (string * int * float) }
adamc@708 2 PRIMARY KEY Client
adamc@698 3
adamc@698 4 fun writeBack v =
adamc@698 5 me <- self;
adamc@698 6 r <- oneRow (SELECT channels.Channel FROM channels WHERE channels.Client = {[me]});
adamc@698 7 send r.Channels.Channel v
adamc@698 8
adamc@698 9 fun main () =
adamc@698 10 me <- self;
adamc@698 11 ch <- channel;
adamc@698 12 dml (INSERT INTO channels (Client, Channel) VALUES ({[me]}, {[ch]}));
adamc@698 13
adamc@698 14 buf <- Buffer.create;
adamc@698 15
adamc@698 16 let
adamc@698 17 fun receiver () =
adamc@698 18 v <- recv ch;
adamc@698 19 Buffer.write buf ("(" ^ v.1 ^ ", " ^ show v.2 ^ ", " ^ show v.3 ^ ")");
adamc@698 20 receiver ()
adamc@698 21
adamc@698 22 fun sender s n f =
adamc@698 23 sleep 2000;
adamc@698 24 writeBack (s, n, f);
adamc@698 25 sender (s ^ "!") (n + 1) (f + 1.23)
adamc@698 26 in
adamc@698 27 return <xml><body onload={spawn (receiver ()); sender "" 0 0.0}>
adamc@698 28 <dyn signal={Buffer.render buf}/>
adamc@698 29 </body></xml>
adamc@698 30 end