Ur/Web: demo/more/orm1.ur annotate

Handling errors during commit

author	Adam Chlipala <adamc@hcoop.net>
date	Tue, 26 Jan 2010 14:59:19 -0500
parents	8d3aa6c7cee0
children	819756825c8d

rev	line source
adamc@991	1 open Orm
adamc@991	2
adamc@991	3 structure T = Table(struct
adamc@1093	4 val cols = {A = local [int],
adamc@1093	5 B = local [string]}
adamc@991	6 end)
adamc@991	7
adamc@991	8 structure S = Table(struct
adamc@991	9 val cols = {C = T.id,
adamc@1093	10 D = local [float]}
adamc@991	11 end)
adamc@991	12
adamc@991	13 fun action () =
adamc@992	14 r1 <- T.create {A = 3, B = "Hi"};
adamc@992	15 T.save (r1 -- #B ++ {B = "Bye"});
adamc@992	16 r2 <- T.create {A = 4, B = "Why"};
adamc@992	17 r3 <- T.create {A = 66, B = "Hi"};
adamc@991	18
adamc@992	19 s <- S.create {C = r1.Id, D = 45.67};
adamc@991	20
adamc@991	21 ls <- T.list;
adamc@991	22 ls' <- T.search (T.eq T.cols.B.Col "Hi");
adamc@991	23
adamc@991	24 lsS <- S.list;
adamc@991	25 lsS <- List.mapM (fn r => p <- S.cols.C.Parent r; return (r, p)) lsS;
adamc@991	26
adamc@992	27 T.delete r1;
adamc@992	28 T.delete r2;
adamc@992	29 T.delete r3;
adamc@992	30
adamc@992	31 S.delete s;
adamc@992	32
adamc@991	33 return <xml><body>
adamc@991	34 {List.mapX (fn r => <xml><li> {[r.A]}: {[r.B]}</li></xml>) ls}
adamc@991	35 <br/>
adamc@991	36 {List.mapX (fn r => <xml><li> {[r.A]}: {[r.B]}</li></xml>) ls'}
adamc@991	37 <br/>
adamc@991	38 {List.mapX (fn (s, ro) => <xml><li> {[s.D]}: {case ro of
adamc@991	39 None => <xml>No parent</xml>
adamc@991	40 \| Some r => <xml>{[r.B]}</xml>}
adamc@991	41 </li></xml>) lsS}
adamc@991	42 </body></xml>
adamc@991	43
adamc@991	44 fun main () = return <xml><body>
adamc@991	45 <form><submit action={action}/></form>
adamc@991	46 </body></xml>

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