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table t : { Id : int, Blob : option blob, MimeType : string }
sequence s
fun getImage id : transaction page =
r <- oneRow1 (SELECT t.Blob, t.MimeType
FROM t
WHERE t.Id = {[id]});
case r.Blob of
None => error <xml>Oh no!</xml>
| Some blob => returnBlob blob (blessMime r.MimeType)
fun main () : transaction page =
let
fun handle r =
id <- nextval s;
dml (INSERT INTO t (Id, Blob, MimeType)
VALUES ({[id]}, {[if fileMimeType r.File = "image/jpeg" then Some (fileData r.File) else None]}, {[fileMimeType r.File]}));
main ()
in
x <- queryX1 (SELECT t.Id FROM t)
(fn r => <xml><img src={url (getImage r.Id)}/><br/></xml>);
return <xml><body>
<form><upload{#File}/> <submit action={handle}/></form>
<hr/>
{x}
</body></xml>
end
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