Mercurial > urweb
view demo/treeFun.ur @ 1998:cc7e5d469d1b
Protect uw_Basis_new_client_source from invalid ctx->id
We assume that FFI code may create new contextes with id left unassigned
author | Sergey Mironov <grrwlf@gmail.com> |
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date | Wed, 26 Feb 2014 09:43:47 +0000 |
parents | 311ca1ae715d |
children |
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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_prim 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 {eqNullable' (SQL 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