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comparison tests/rpcDE.ur @ 638:3ee6bb48f6e8

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RPC returning an enumeration
author Adam Chlipala <adamc@hcoop.net>
date Sun, 08 Mar 2009 12:37:42 -0400
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637:24fd1edfcaa3 638:3ee6bb48f6e8
1 datatype result = Neg | Zero | Pos
2
3 table t : {A : int}
4
5 fun main () : transaction page =
6 let
7 fun check () =
8 r <- oneRow (SELECT SUM(t.A) AS X FROM t);
9 return (if r.X < 0 then
10 Neg
11 else if r.X = 0 then
12 Zero
13 else
14 Pos)
15
16 fun show r =
17 case r of
18 Neg => <xml>-</xml>
19 | Zero => <xml>0</xml>
20 | Pos => <xml>+</xml>
21 in
22 s <- source Zero;
23 return <xml><body>
24 <button value="Get It On!"
25 onclick={r <- check ();
26 set s r}/><br/>
27 <br/>
28 Current: <dyn signal={r <- signal s; return (show r)}/>
29 </body></xml>
30 end