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|
datatype list t = Nil | Cons of t * list t
table t : {Id : int, A : string}
PRIMARY KEY Id
fun allRows () =
query (SELECT * FROM t)
(fn r acc => return (Cons ((r.T.Id, r.T.A), acc)))
Nil
fun doBatch ls =
case ls of
Nil => return ()
| Cons ((id, a), ls') =>
dml (INSERT INTO t (Id, A) VALUES ({[id]}, {[a]}));
doBatch ls'
fun del id =
dml (DELETE FROM t WHERE t.Id = {[id]})
fun show withDel lss =
let
fun show' ls =
case ls of
Nil => <xml/>
| Cons ((id, a), ls) => <xml>
<tr><td>{[id]}</td> <td>{[a]}</td> {if withDel then
<xml><td><button value="Delete" onclick={del id}/></td></xml>
else
<xml/>} </tr>
{show' ls}
</xml>
in
<xml><dyn signal={ls <- signal lss; return <xml><table>
<tr> <th>Id</th> <th>A</th> </tr>
{show' ls}
</table></xml>}/></xml>
end
fun action () =
lss <- source Nil;
batched <- source Nil;
id <- source "";
a <- source "";
let
fun add () =
id <- get id;
a <- get a;
ls <- get batched;
set batched (Cons ((readError id, a), ls))
fun exec () =
ls <- get batched;
doBatch ls;
set batched Nil
in
return <xml><body>
<h2>Rows</h2>
{show True lss}
<button value="Update" onclick={ls <- allRows (); set lss ls}/><br/>
<br/>
<h2>Batch new rows to add</h2>
<table>
<tr> <th>Id:</th> <td><ctextbox source={id}/></td> </tr>
<tr> <th>A:</th> <td><ctextbox source={a}/></td> </tr>
<tr> <th/> <td><button value="Batch it" onclick={add ()}/></td> </tr>
</table>
<h2>Already batched:</h2>
{show False batched}
<button value="Execute" onclick={exec ()}/>
</body></xml>
end
fun main () = return <xml><body>
<form><submit value="Begin demo" action={action}/></form>
</body></xml>
|
