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table t : { O : option int }
fun addNull () =
dml (INSERT INTO t (O) VALUES (NULL));
return <xml>Done</xml>
fun add3 () =
dml (INSERT INTO t (O) VALUES ({Some 3}));
return <xml>Done</xml>
fun addN r =
dml (INSERT INTO t (O) VALUES ({Some (readError r.N)}));
return <xml>Done</xml>
fun main () : transaction page =
xml <- queryX (SELECT * FROM t)
(fn r => case r.T.O of
None => <xml>Nada<br/></xml>
| Some n => <xml>Num: {[n]}<br/></xml>);
return <xml><body>
{xml}
<a link={addNull ()}>Add a null</a><br/>
<a link={add3 ()}>Add a 3</a><br/>
<form>
Add <textbox{#N}/> <submit action={addN}/>
</form>
</body></xml>
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