Ur/Web: tests/query.ur annotate

Type inference

author	Adam Chlipala <adamc@hcoop.net>
date	Sat, 06 Dec 2008 12:01:12 -0500
parents	f8d9395575ec
children	5f9b9972e6b8

rev	line source
adamc@253	1 table t1 : {A : int, B : string, C : float, D : bool}
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@254	6 val q1 = (SELECT * FROM t1)
adamc@253	7
adamc@253	8 val r1 : transaction (list {A : int, B : string, C : float, D : bool}) =
adamc@243	9 query q1
adamc@251	10 (fn fs acc => return (Cons (fs.T1, acc)))
adamc@243	11 Nil
adamc@243	12
adamc@249	13 val r2 : transaction string =
adamc@243	14 ls <- r1;
adamc@243	15 return (case ls of
adamc@249	16 Nil => "Problem"
adamc@249	17 \| Cons ({B = b, ...}, _) => b)
adamc@249	18
adamc@249	19 val main : unit -> transaction page = fn () =>
adamc@249	20 s <- r2;
adamc@249	21 return <html><body>
adamc@249	22 {cdata s}
adamc@249	23 </body></html>

Mercurial > urweb