Mercurial > urweb
view tests/query.ur @ 253:7f6620853c36
Monoized a WHERE clause with a comparison
author | Adam Chlipala <adamc@hcoop.net> |
---|---|
date | Sun, 31 Aug 2008 14:27:01 -0400 |
parents | 326fb4686f60 |
children | f8d9395575ec |
line wrap: on
line source
table t1 : {A : int, B : string, C : float, D : bool} table t2 : {A : float, D : int} datatype list a = Nil | Cons of a * list a (*val q1 = (SELECT * FROM t1)*) val q1 = (SELECT * FROM t1 WHERE t1.A = 0) val r1 : transaction (list {A : int, B : string, C : float, D : bool}) = query q1 (fn fs acc => return (Cons (fs.T1, acc))) Nil val r2 : transaction string = ls <- r1; return (case ls of Nil => "Problem" | Cons ({B = b, ...}, _) => b) val main : unit -> transaction page = fn () => s <- r2; return <html><body> {cdata s} </body></html>