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datatype list t = Nil | Cons of t * list t
table t : { Id : int, A : string }
fun add id s =
dml (INSERT INTO t (Id, A) VALUES ({[id]}, {[s]}))
fun del id =
dml (DELETE FROM t WHERE t.Id = {[id]})
fun lookup id =
ro <- oneOrNoRows (SELECT t.A FROM t WHERE t.Id = {[id]});
case ro of
None => return None
| Some r => return (Some r.T.A)
fun check ls =
case ls of
Nil => return ()
| Cons (id, ls') =>
ao <- lookup id;
alert (case ao of
None => "Nada"
| Some a => a);
check ls'
fun main () =
idAdd <- source "";
aAdd <- source "";
idDel <- source "";
return <xml><body>
<button value="Check values of 1, 2, and 3" onclick={check (Cons (1, Cons (2, Cons (3, Nil))))}/><br/>
<br/>
<button value="Add" onclick={id <- get idAdd; a <- get aAdd; add (readError id) a}/>
<ctextbox source={idAdd}/>
<ctextbox source={aAdd}/><br/>
<br/>
<button value="Delete" onclick={id <- get idDel; del (readError id)}/>
<ctextbox source={idDel}/>
</body></xml>
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