Ur/Web: tests/query.ur annotate

Explify tables

author	Adam Chlipala <adamc@hcoop.net>
date	Sun, 31 Aug 2008 08:46:22 -0400
parents	71bafe66dbe1
children	b6b75e6e0898

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@243	12 val r2 : transaction int =
adamc@243	13 ls <- r1;
adamc@243	14 return (case ls of
adamc@243	15 Nil => 0
adamc@243	16 \| Cons ({A = a, ...}, _) => a)

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