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con link = fn t :: Type => unit
con meta = fn col :: Type => {
Link : link col,
Inj : sql_injectable col
}
functor Table(M : sig
con cols :: {Type}
val cols : $(map meta cols)
constraint [Id] ~ cols
val folder : folder cols
end) = struct
type id = int
val inj = _
val id : meta id = {Link = (),
Inj = inj}
sequence s
table t : ([Id = id] ++ M.cols)
type row = $([Id = id] ++ M.cols)
fun ensql [avail] (r : $M.cols) : $(map (sql_exp avail [] []) M.cols) =
map2 [meta] [Top.id] [sql_exp avail [] []]
(fn [t] meta v => @sql_inject meta.Inj v)
[_] M.folder M.cols r
fun create (r : $M.cols) =
id <- nextval s;
dml (insert t ({Id = sql_inject id} ++ ensql r));
return ({Id = id} ++ r)
fun delete r = dml (DELETE FROM t WHERE t.Id = {[r.Id]})
fun save r = dml (update [M.cols] ! (ensql (r -- #Id)) t (WHERE T.Id = {[r.Id]}))
fun lookup id =
ro <- oneOrNoRows (SELECT * FROM t WHERE t.Id = {[id]});
return (Option.mp (fn r => r.T) ro)
val list = query (SELECT * FROM t) (fn r ls => return (r.T :: ls)) []
end
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