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+con colMeta = fn t_formT :: (Type * Type) => {
+ Nam : string,
+ Show : t_formT.1 -> xbody,
+ Widget : nm :: Name -> xml form [] [nm = t_formT.2],
+ WidgetPopulated : nm :: Name -> t_formT.1 -> xml form [] [nm = t_formT.2],
+ Parse : t_formT.2 -> t_formT.1,
+ Inject : sql_injectable t_formT.1
+ }
+con colsMeta = fn cols :: {(Type * Type)} => $(Top.mapT2T colMeta cols)
+
+fun default (t ::: Type) (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 tab : sql_table ([Id = int] ++ mapT2T fstTT cols)
+
+ val title : string
+
+ val cols : colsMeta cols
+ end) = struct
+
+ open constraints M
+ val tab = M.tab
+
+ sequence seq
+
+ fun list () =
+ rows <- queryX (SELECT * FROM tab AS T)
+ (fn (fs : {T : $([Id = int] ++ mapT2T fstTT M.cols)}) => <xml>
+ <tr>
+ <td>{[fs.T.Id]}</td>
+ {foldT2RX2 [fstTT] [colMeta] [tr]
+ (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
+ [[nm] ~ rest] v col => <xml>
+ <td>{col.Show v}</td>
+ </xml>)
+ [M.cols] (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>
+ {foldT2RX [colMeta] [tr]
+ (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
+ [[nm] ~ rest] col => <xml>
+ <th>{cdata col.Nam}</th>
+ </xml>)
+ [M.cols] M.cols}
+ </tr>
+ {rows}
+ </table>
+
+ <br/><hr/><br/>
+
+ <form>
+ {foldT2R [colMeta] [fn cols :: {(Type * Type)} => xml form [] (mapT2T sndTT cols)]
+ (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
+ [[nm] ~ rest] (col : colMeta t) (acc : xml form [] (mapT2T sndTT rest)) => <xml>
+ <li> {cdata col.Nam}: {col.Widget [nm]}</li>
+ {useMore acc}
+ </xml>)
+ <xml/>
+ [M.cols] M.cols}
+
+ <submit action={create}/>
+ </form>
+ </xml>
+
+ and create (inputs : $(mapT2T sndTT M.cols)) =
+ id <- nextval seq;
+ () <- dml (insert tab
+ (foldT2R2 [sndTT] [colMeta]
+ [fn cols => $(mapT2T (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 with nm = @sql_inject col.Inject (col.Parse input))
+ {} [M.cols] inputs M.cols
+ with #Id = (SQL {id})));
+ ls <- list ();
+ return <xml><body>
+ <p>Inserted with ID {[id]}.</p>
+
+ {ls}
+ </body></xml>
+
+ and save (id : int) (inputs : $(mapT2T sndTT M.cols)) =
+ () <- dml (update [mapT2T fstTT M.cols]
+ (foldT2R2 [sndTT] [colMeta]
+ [fn cols => $(mapT2T (fn t :: (Type * Type) =>
+ sql_exp [T = [Id = int]
+ ++ mapT2T fstTT M.cols]
+ [] [] t.1) cols)]
+ (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
+ [[nm] ~ rest] =>
+ fn input col acc => acc with nm =
+ @sql_inject col.Inject (col.Parse input))
+ {} [M.cols] inputs M.cols)
+ tab (WHERE T.Id = {id}));
+ ls <- list ();
+ return <xml><body>
+ <p>Saved!</p>
+
+ {ls}
+ </body></xml>
+
+ and upd (id : int) =
+ fso <- oneOrNoRows (SELECT tab.{{mapT2T fstTT M.cols}} FROM tab WHERE tab.Id = {id});
+ case fso : (Basis.option {Tab : $(mapT2T fstTT M.cols)}) of
+ None => return <xml><body>Not found!</body></xml>
+ | Some fs => return <xml><body><form>
+ {foldT2R2 [fstTT] [colMeta] [fn cols :: {(Type * Type)} => xml form [] (mapT2T sndTT cols)]
+ (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
+ [[nm] ~ rest] (v : t.1) (col : colMeta t)
+ (acc : xml form [] (mapT2T sndTT rest)) =>
+ <xml>
+ <li> {cdata col.Nam}: {col.WidgetPopulated [nm] v}</li>
+ {useMore acc}
+ </xml>)
+ <xml/>
+ [M.cols] fs.Tab M.cols}
+
+ <submit action={save id}/>
+ </form></body></xml>
+
+ and delete (id : int) =
+ () <- dml (DELETE FROM tab WHERE Id = {id});
+ ls <- list ();
+ return <xml><body>
+ <p>The deed is done.</p>
+
+ {ls}
+ </body></xml>
+
+ and confirm (id : int) = return <xml><body>
+ <p>Are you sure you want to delete ID #{[id]}?</p>
+
+ <p><a link={delete id}>I was born sure!</a></p>
+ </body></xml>
+
+ and main () =
+ ls <- list ();
+ return <xml><head>
+ <title>{cdata M.title}</title>
+ </head><body>
+
+ <h1>{cdata M.title}</h1>
+
+ {ls}
+ </body></xml>
+
+end