Mercurial > urweb
view demo/treeFun.ur @ 631:effa7d43aac3
Make folders abstract
author | Adam Chlipala <adamc@hcoop.net> |
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date | Tue, 24 Feb 2009 14:04:07 -0500 |
parents | 20fab0e96217 |
children | 1fb318c17546 |
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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 {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