Ur/Web: tests/query.ur annotate

Corify transaction wrappers

author	Adam Chlipala <adamc@hcoop.net>
date	Sun, 31 Aug 2008 09:45:23 -0400
parents	71bafe66dbe1
children	326fb4686f60

rev	line source
adamc@243	1 table t1 : {A : int, B : string, C : float}
adamc@243	2 table t2 : {A : float, D : int}
adamc@243	3
adamc@243	4 datatype list a = Nil \| Cons of a * list a
adamc@243	5
adamc@243	6 val q1 = (SELECT * FROM t1)
adamc@243	7 val r1 : transaction (list {A : int, B : string, C : float}) =
adamc@243	8 query q1
adamc@243	9 (fn fs _ acc => return (Cons (fs.T1, acc)))
adamc@243	10 Nil
adamc@243	11
adamc@249	12 val r2 : transaction string =
adamc@243	13 ls <- r1;
adamc@243	14 return (case ls of
adamc@249	15 Nil => "Problem"
adamc@249	16 \| Cons ({B = b, ...}, _) => b)
adamc@249	17
adamc@249	18 val main : unit -> transaction page = fn () =>
adamc@249	19 s <- r2;
adamc@249	20 return <html><body>
adamc@249	21 {cdata s}
adamc@249	22 </body></html>

Mercurial > urweb