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functor Make(M : sig
type key
con id :: Name
con parent :: Name
con cols :: {Type}
constraint [id] ~ [parent]
constraint [id, parent] ~ cols
val key_inj : sql_injectable key
val option_key_inj : sql_injectable (option key)
table tab : [id = key, parent = option key] ++ cols
end) = struct
open M
fun tree (f : $([id = key, parent = option key] ++ cols) -> xbody)
(root : option M.key) =
let
fun recurse (root : option key) =
queryX' (SELECT * FROM tab WHERE tab.{parent} = {root})
(fn r =>
children <- recurse (Some r.Tab.id);
return <xml>
<li> {f r.Tab}</li>
<ul>
{children}
</ul>
</xml>)
in
recurse root
end
end
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