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)
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 {txt _ 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] =>
fn (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 #{txt _ id}?
I was born sure!
fun main () =
rows <- queryX (SELECT * FROM tab AS T)
(fn (fs : {T : $([Id = int] ++ mapT2T fstTT M.cols)}) =>
| {txt _ fs.T.Id} |
{foldT2RX2 [fstTT] [colMeta] [tr]
(fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)}) =>
[[nm] ~ rest] =>
fn v col =>
| {col.Show v} |
)
[M.cols] (fs.T -- #Id) M.cols}
[Update] [Delete] |
);
return
{cdata M.title}
{cdata M.title}
| ID |
{foldT2RX [colMeta] [tr]
(fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)}) =>
[[nm] ~ rest] =>
fn col =>
| {cdata col.Nam} |
)
[M.cols] M.cols}
{rows}
{foldT2R [colMeta] [fn cols :: {(Type * Type)} => xml form [] (mapT2T sndTT cols)]
(fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)}) =>
[[nm] ~ rest] =>
fn (col : colMeta t) (acc : xml form [] (mapT2T sndTT rest)) =>
{cdata col.Nam}: {col.Widget [nm]}
{useMore acc}
)
[M.cols] M.cols}
end