Ur/Web: demo/tree.ur annotate

Transactionalize channel operations

author	Adam Chlipala <adamc@hcoop.net>
date	Tue, 24 Mar 2009 14:44:45 -0400
parents	20fab0e96217
children	1a317a707d71

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

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