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con colMeta = fn (db :: Type, state :: Type) =>
{Nam : string,
Show : db -> xbody,
Inject : sql_injectable db,
NewState : transaction state,
Widget : state -> xbody,
ReadState : state -> transaction db}
con colsMeta = fn cols :: {(Type * Type)} => $(map colMeta cols)
fun default [t] (sh : show t) (rd : read t) (inj : sql_injectable t)
name : colMeta (t, source string) =
{Nam = name,
Show = txt,
Inject = _,
NewState = source "",
Widget = fn s => <xml><ctextbox source={s}/></xml>,
ReadState = fn s => v <- get s; return (readError v)}
val int = default
val float = default
val string = default
functor Make(M : sig
con cols :: {(Type * Type)}
constraint [Id] ~ cols
val fl : folder cols
table tab : ([Id = int] ++ map fst cols)
val title : string
val cols : colsMeta cols
end) = struct
val t = M.tab
datatype list t = Nil | Cons of t * list t
fun allRows () =
query (SELECT * FROM t)
(fn r acc => return (Cons (r.T, acc)))
Nil
fun add r =
dml (insert t
(@foldR2 [fst] [colMeta]
[fn cols => $(map (fn t :: (Type * Type) =>
sql_exp [] [] [] t.1) cols)]
(fn [nm :: Name] [t :: (Type * Type)] [rest :: {(Type * Type)}]
[[nm] ~ rest] input col acc =>
acc ++ {nm = @sql_inject col.Inject input})
{} M.fl (r -- #Id) M.cols
++ {Id = (SQL {[r.Id]})}))
fun doBatch ls =
case ls of
Nil => return ()
| Cons (r, ls') =>
add r;
doBatch ls'
fun del id =
dml (DELETE FROM t WHERE t.Id = {[id]})
fun show withDel lss =
let
fun show' ls =
case ls of
Nil => <xml/>
| Cons (r, ls) => <xml>
<tr>
<td>{[r.Id]}</td>
{@foldRX2 [colMeta] [fst] [_]
(fn [nm :: Name] [p :: (Type * Type)] [rest :: {(Type * Type)}]
[[nm] ~ rest] m v =>
<xml><td>{m.Show v}</td></xml>)
M.fl M.cols (r -- #Id)}
{if withDel then
<xml><td><button value="Delete" onclick={rpc (del r.Id)}/></td></xml>
else
<xml/>}
</tr>
{show' ls}
</xml>
in
<xml><dyn signal={ls <- signal lss; return <xml><table>
<tr>
<th>Id</th>
{@foldRX [colMeta] [_]
(fn [nm :: Name] [p :: (Type * Type)] [rest :: {(Type * Type)}]
[[nm] ~ rest] m =>
<xml><th>{[m.Nam]}</th></xml>)
M.fl M.cols}
</tr>
{show' ls}
</table></xml>}/></xml>
end
fun main () =
lss <- source Nil;
batched <- source Nil;
id <- source "";
inps <- @foldR [colMeta] [fn r => transaction ($(map snd r))]
(fn [nm :: Name] [p :: (Type * Type)] [rest :: {(Type * Type)}] [[nm] ~ rest] m acc =>
s <- m.NewState;
r <- acc;
return ({nm = s} ++ r))
(return {})
M.fl M.cols;
let
fun add () =
id <- get id;
vs <- @foldR2 [colMeta] [snd] [fn r => transaction ($(map fst r))]
(fn [nm :: Name] [p :: (Type * Type)] [rest :: {(Type * Type)}]
[[nm] ~ rest] m s acc =>
v <- m.ReadState s;
r <- acc;
return ({nm = v} ++ r))
(return {})
M.fl M.cols inps;
ls <- get batched;
set batched (Cons ({Id = readError id} ++ vs, ls))
fun exec () =
ls <- get batched;
rpc (doBatch ls);
set batched Nil
in
return <xml><body>
<h2>Rows</h2>
{show True lss}
<button value="Update" onclick={ls <- rpc (allRows ()); set lss ls}/><br/>
<br/>
<h2>Batch new rows to add</h2>
<table>
<tr> <th>Id:</th> <td><ctextbox source={id}/></td> </tr>
{@foldRX2 [colMeta] [snd] [_]
(fn [nm :: Name] [p :: (Type * Type)] [rest :: {(Type * Type)}]
[[nm] ~ rest] m s =>
<xml><tr> <th>{[m.Nam]}:</th> <td>{m.Widget s}</td> </tr></xml>)
M.fl M.cols inps}
<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
end
|
