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 => , 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 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 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}))); return Inserted with ID {[id]}. fun 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})); return Saved! fun update (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 Not found! | Some fs => return
{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)) =>
  • {cdata col.Nam}: {col.WidgetPopulated [nm] v}
    • {useMore acc}     ) [M.cols] fs.Tab M.cols}
    fun delete (id : int) = () <- dml (DELETE FROM tab WHERE Id = {id}); return The deed is done. fun confirm (id : int) = return

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

    I was born sure!

     fun main () = rows <- queryX (SELECT * FROM tab AS T) (fn (fs : {T : $([Id = int] ++ mapT2T fstTT M.cols)}) => {[fs.T.Id]} {foldT2RX2 [fstTT] [colMeta] [tr] (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)}) [[nm] ~ rest] v col => {col.Show v} ) [M.cols] (fs.T -- #Id) M.cols} [Update] [Delete] ); return {cdata M.title}

    {cdata M.title}

    {foldT2RX [colMeta] [tr] (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)}) [[nm] ~ rest] col => ) [M.cols] M.cols} {rows}
    ID{cdata col.Nam}

    {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)) =>
  • {cdata col.Nam}: {col.Widget [nm]}
    • {useMore acc}     ) [M.cols] M.cols}
    end