Ur/Web: tests/query.ur annotate

Tutorial: TLC meets type classes and modules

author	Adam Chlipala <adam@chlipala.net>
date	Sun, 17 Jul 2011 13:04:07 -0400
parents	5f9b9972e6b8
children

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@748	9 query q1
adamc@748	10 (fn fs acc => return (Cons (fs.T1, acc)))
adamc@748	11 Nil
adamc@243	12
adamc@249	13 val r2 : transaction string =
adamc@748	14 ls <- r1;
adamc@748	15 return (case ls of
adamc@748	16 Nil => "Problem"
adamc@748	17 \| Cons ({B = b, ...}, _) => b)
adamc@249	18
adamc@748	19 fun main () : transaction page =
adamc@748	20 s <- r2;
adamc@748	21 return <xml><body>
adamc@748	22 {cdata s}
adamc@748	23 </body></xml>

Mercurial > urweb