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con colMeta = fn (db :: Type, widget :: Type) =>
{Nam : string,
Show : db -> xbody,
Widget : nm :: Name -> xml form [] [nm = widget],
WidgetPopulated : nm :: Name -> db -> xml form [] [nm = widget],
Parse : widget -> db,
Inject : sql_injectable 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, string) =
{Nam = name,
Show = txt,
Widget = fn [nm :: Name] => <xml><textbox{nm}/></xml>,
WidgetPopulated = fn [nm :: Name] n =>
<xml><textbox{nm} value={show n}/></xml>,
Parse = readError,
Inject = _}
val int = default
val float = default
val string = default
fun bool name = {Nam = name,
Show = txt,
Widget = fn [nm :: Name] => <xml><checkbox{nm}/></xml>,
WidgetPopulated = fn [nm :: Name] b =>
<xml><checkbox{nm} checked={b}/></xml>,
Parse = fn x => x,
Inject = _}
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 tab = M.tab
sequence seq
fun list () =
rows <- queryX (SELECT * FROM tab AS T)
(fn (fs : {T : $([Id = int] ++ map fst M.cols)}) => <xml>
<tr>
<td>{[fs.T.Id]}</td>
{foldRX2 [fst] [colMeta] [tr]
(fn [nm :: Name] [t :: (Type * Type)] [rest :: {(Type * Type)}]
[[nm] ~ rest] v col => <xml>
<td>{col.Show v}</td>
</xml>)
[M.cols] M.fl (fs.T -- #Id) M.cols}
<td>
<a link={upd fs.T.Id}>[Update]</a>
<a link={confirm fs.T.Id}>[Delete]</a>
</td>
</tr>
</xml>);
return <xml>
<table border={1}>
<tr>
<th>ID</th>
{foldRX [colMeta] [tr]
(fn [nm :: Name] [t :: (Type * Type)] [rest :: {(Type * Type)}]
[[nm] ~ rest] col => <xml>
<th>{cdata col.Nam}</th>
</xml>)
[M.cols] M.fl M.cols}
</tr>
{rows}
</table>
<br/><hr/><br/>
<form>
{foldR [colMeta] [fn cols :: {(Type * Type)} => xml form [] (map snd cols)]
(fn [nm :: Name] [t :: (Type * Type)] [rest :: {(Type * Type)}]
[[nm] ~ rest] (col : colMeta t) (acc : xml form [] (map snd rest)) => <xml>
<li> {cdata col.Nam}: {col.Widget [nm]}</li>
{useMore acc}
</xml>)
<xml/>
[M.cols] M.fl M.cols}
<submit action={create}/>
</form>
</xml>
and create (inputs : $(map snd M.cols)) =
id <- nextval seq;
dml (insert tab
(foldR2 [snd] [colMeta]
[fn cols => $(map (fn t :: (Type * Type) =>
sql_exp [] [] [] t.1) cols)]
(fn [nm :: Name] [t :: (Type * Type)] [rest :: {(Type * Type)}]
[[nm] ~ rest] =>
fn input col acc => acc ++ {nm = @sql_inject col.Inject (col.Parse input)})
{} [M.cols] M.fl inputs M.cols
++ {Id = (SQL {[id]})}));
ls <- list ();
return <xml><body>
<p>Inserted with ID {[id]}.</p>
{ls}
</body></xml>
and upd (id : int) =
let
fun save (inputs : $(map snd M.cols)) =
dml (update [map fst M.cols] !
(foldR2 [snd] [colMeta]
[fn cols => $(map (fn t :: (Type * Type) =>
sql_exp [T = [Id = int]
++ map fst M.cols]
[] [] t.1) cols)]
(fn [nm :: Name] [t :: (Type * Type)] [rest :: {(Type * Type)}]
[[nm] ~ rest] =>
fn input col acc => acc ++ {nm =
@sql_inject col.Inject (col.Parse input)})
{} [M.cols] M.fl inputs M.cols)
tab (WHERE T.Id = {[id]}));
ls <- list ();
return <xml><body>
<p>Saved!</p>
{ls}
</body></xml>
in
fso <- oneOrNoRows (SELECT tab.{{map fst M.cols}} FROM tab WHERE tab.Id = {[id]});
case fso : (Basis.option {Tab : $(map fst M.cols)}) of
None => return <xml><body>Not found!</body></xml>
| Some fs => return <xml><body><form>
{foldR2 [fst] [colMeta] [fn cols :: {(Type * Type)} => xml form [] (map snd cols)]
(fn [nm :: Name] [t :: (Type * Type)] [rest :: {(Type * Type)}]
[[nm] ~ rest] (v : t.1) (col : colMeta t)
(acc : xml form [] (map snd rest)) =>
<xml>
<li> {cdata col.Nam}: {col.WidgetPopulated [nm] v}</li>
{useMore acc}
</xml>)
<xml/>
[M.cols] M.fl fs.Tab M.cols}
<submit action={save}/>
</form></body></xml>
end
and confirm (id : int) =
let
fun delete () =
dml (DELETE FROM tab WHERE Id = {[id]});
ls <- list ();
return <xml><body>
<p>The deed is done.</p>
{ls}
</body></xml>
in
return <xml><body>
<p>Are you sure you want to delete ID #{[id]}?</p>
<form><submit action={delete} value="I was born sure!"/></form>
</body></xml>
end
and main () =
ls <- list ();
return <xml><head>
<title>{cdata M.title}</title>
</head><body>
<h1>{cdata M.title}</h1>
{ls}
</body></xml>
end
|
