Ur/Web: demo/tree.ur annotate

CHECK constraints

author	Adam Chlipala <adamc@hcoop.net>
date	Thu, 09 Apr 2009 15:30:15 -0400
parents	1a317a707d71
children	1db127b245ed

rev	line source
adamc@471	1 sequence s
adamc@469	2 table t : { Id : int, Parent : option int, Nam : string }
adamc@708	3 PRIMARY KEY Id
adamc@469	4
adamc@469	5 open TreeFun.Make(struct
adamc@469	6 val tab = t
adamc@469	7 end)
adamc@469	8
adamc@469	9 fun row r = <xml>
adamc@471	10 #{[r.Id]}: {[r.Nam]} <a link={del r.Id}>[Delete]</a>
adamc@471	11
adamc@471	12 <form>
adamc@471	13 Add child: <textbox{#Nam}/> <submit action={add (Some r.Id)}/>
adamc@471	14 </form>
adamc@469	15 </xml>
adamc@469	16
adamc@471	17 and main () =
adamc@469	18 xml <- tree row None;
adamc@469	19 return <xml><body>
adamc@469	20 {xml}
adamc@471	21
adamc@471	22 <form>
adamc@471	23 Add a top-level node: <textbox{#Nam}/> <submit action={add None}/>
adamc@471	24 </form>
adamc@469	25 </body></xml>
adamc@471	26
adamc@471	27 and add parent r =
adamc@471	28 id <- nextval s;
adamc@471	29 dml (INSERT INTO t (Id, Parent, Nam) VALUES ({[id]}, {[parent]}, {[r.Nam]}));
adamc@471	30 main ()
adamc@471	31
adamc@471	32 and del id =
adamc@471	33 dml (DELETE FROM t WHERE Id = {[id]});
adamc@471	34 main ()

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