Ur/Web: tests/order_by.ur annotate

Fix a read-after-free bug using a timestamp check

author	Adam Chlipala <adam@chlipala.net>
date	Thu, 19 Nov 2015 13:18:58 -0500
parents	bacd0ba869e1
children

rev	line source
adamc@230	1 table t1 : {A : int, B : string, C : float}
adamc@230	2 table t2 : {A : float, D : int}
adamc@230	3
adamc@230	4 val q1 = (SELECT * FROM t1 ORDER BY t1.A, t1.B)
adamc@230	5 val q2 = (SELECT * FROM t1 GROUP BY t1.A ORDER BY t1.A, t1.B)
adamc@230	6 val q3 = (SELECT t1.B FROM t1
adamc@230	7 UNION SELECT t1.B FROM t1
adamc@230	8 ORDER BY t1.B)
adamc@234	9
adamc@234	10 val q4 = (SELECT t1.A, t2.D, t1.A < t2.D AS Lt
adamc@234	11 FROM t1, t2
adamc@234	12 ORDER BY Lt)
adamc@261	13 val q5 = (SELECT t1.A, t1.B, t2.D, t1.A < t2.D AS Lt
adamc@234	14 FROM t1, t2
adamc@268	15 ORDER BY t1.A DESC, Lt ASC, t2.D DESC)
adamc@261	16
adamc@261	17
adamc@261	18 datatype list a = Nil \| Cons of a * list a
adamc@261	19
adamc@261	20 val r1 : transaction (list string) =
adamc@261	21 query q5
adamc@261	22 (fn fs acc => return (Cons (fs.T1.B, acc)))
adamc@261	23 Nil
adamc@261	24
adamc@261	25 val r2 : transaction string =
adamc@261	26 ls <- r1;
adamc@261	27 return (case ls of
adamc@261	28 Nil => "Problem"
adamc@261	29 \| Cons (b, _) => b)
adamc@261	30
adamc@261	31 val main : unit -> transaction page = fn () =>
adamc@261	32 s <- r2;
adamc@261	33 return <html><body>
adamc@261	34 {cdata s}
adamc@261	35 </body></html>

Mercurial > urweb