Ur/Web: tests/nested.ur annotate

Compiled an 'option' pattern-match

author	Adam Chlipala <adamc@hcoop.net>
date	Tue, 22 Sep 2009 14:15:29 -0400
parents	8e9f2d247dba
children

rev	line source
adamc@880	1 table t : {A : int, B : int}
adamc@880	2
adamc@880	3 fun init () =
adamc@880	4 dml (DELETE FROM t WHERE TRUE);
adamc@880	5 dml (INSERT INTO t (A, B) VALUES (1, 2));
adamc@880	6 dml (INSERT INTO t (A, B) VALUES (2, 3))
adamc@880	7
adamc@880	8 fun easy () =
adamc@880	9 queryX' (SELECT MAX(t.A) AS M FROM t)
adamc@880	10 (fn r =>
adamc@880	11 queryX (SELECT * FROM t WHERE t.A = {[r.M]})
adamc@880	12 (fn r => <xml>({[r.T.A]}, {[r.T.B]})</xml>))
adamc@880	13
adamc@880	14 fun hard id =
adamc@880	15 queryX' (SELECT t.B AS N FROM t WHERE t.A = {[id]})
adamc@880	16 (fn r =>
adamc@880	17 b <- hard r.N;
adamc@880	18 return <xml>({[id]}, {[r.N]}); {b}</xml>)
adamc@880	19
adamc@880	20 fun doit () =
adamc@880	21 init ();
adamc@880	22 b1 <- easy ();
adamc@880	23 b2 <- hard 1;
adamc@880	24 return <xml><body>
adamc@880	25 {b1}<br/>
adamc@880	26 {b2}
adamc@880	27 </body></xml>
adamc@880	28
adamc@880	29 fun main () = return <xml><body><form><submit action={doit}/></form></body></xml>

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