annotate tests/query.ur @ 246:3aa010e97db9

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)