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] => , WidgetPopulated = fn [nm :: Name] n => , Parse = readError, Inject = _} val int = default val float = default val string = default fun bool name = {Nam = name, Show = txt, Widget = fn [nm :: Name] => , WidgetPopulated = fn [nm :: Name] b => , 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)}) => {[fs.T.Id]} {@mapX2 [fst] [colMeta] [tr] (fn [nm :: Name] [t :: (Type * Type)] [rest :: {(Type * Type)}] [[nm] ~ rest] v col => {col.Show v} ) M.fl (fs.T -- #Id) M.cols} [Update] [Delete] ); return {@mapX [colMeta] [tr] (fn [nm :: Name] [t :: (Type * Type)] [rest :: {(Type * Type)}] [[nm] ~ rest] col => ) M.fl M.cols} {rows}
ID{cdata col.Nam}



{@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)) =>
  • {cdata col.Nam}: {col.Widget [nm]}
  • {useMore acc}
    ) M.fl M.cols}
    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.fl inputs M.cols ++ {Id = (SQL {[id]})})); ls <- list (); return

    Inserted with ID {[id]}.

    {ls}
    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.fl inputs M.cols) tab (WHERE T.Id = {[id]})); ls <- list (); return

    Saved!

    {ls}
    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 Not found! | Some fs => return
    {@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)) =>
  • {cdata col.Nam}: {col.WidgetPopulated [nm] v}
  • {useMore acc}
    ) M.fl fs.Tab M.cols}
    end and confirm (id : int) = let fun delete () = dml (DELETE FROM tab WHERE Id = {[id]}); ls <- list (); return

    The deed is done.

    {ls}
    in return

    Are you sure you want to delete ID #{[id]}?

    end and main () = ls <- list (); return {cdata M.title}

    {cdata M.title}

    {ls}
    end