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diff tests/group_by.ur @ 255:69d337f186eb

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Monoized GROUP BY
author Adam Chlipala <adamc@hcoop.net>
date Sun, 31 Aug 2008 15:04:10 -0400
parents 71bafe66dbe1
children d1b679dbbc25
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line diff
--- a/tests/group_by.ur	Sun Aug 31 14:33:22 2008 -0400
+++ b/tests/group_by.ur	Sun Aug 31 15:04:10 2008 -0400
@@ -9,3 +9,23 @@
 
 val q5 = (SELECT t1.A, t2.D FROM t1, t2 GROUP BY t2.D, t1.A)
 val q6 = (SELECT t1.A, t2.D FROM t1, t2 WHERE t1.C = 0.0 GROUP BY t2.D, t1.A HAVING t1.A = t1.A AND t2.D = 17)
+
+
+datatype list a = Nil | Cons of a * list a
+
+val r1 : transaction (list {B : string}) =
+        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>