diff options
| author |  Adam Chlipala <adamc@hcoop.net> | 2008-10-30 15:16:37 -0400 |
|---|---|---|
| committer | Adam Chlipala <adamc@hcoop.net> | 2008-10-30 15:16:37 -0400 |
| commit | d710cc7a5aa246763af96dfca57ec8a7a5a6fd37 (patch) | |
| tree | fe9ae1798baecaadf006b54d792997b0fb2db54c | |
| parent | 5400696e2584c331c6fa6c9627a6c60d08327480 (diff) | |
Time MIN/MAX
| -rw-r--r-- | lib/top.ur | 8 | ||||
| -rw-r--r-- | lib/top.urs | 10 | ||||
| -rw-r--r-- | tests/time.ur | 4 |
3 files changed, 21 insertions, 1 deletions
@@ -157,3 +157,11 @@ fun oneOrNoRows (tables ::: {{Type}}) (exps ::: {Type}) query q (fn fs _ => return (Some fs)) None + +fun oneRow (tables ::: {{Type}}) (exps ::: {Type}) + (q : sql_query tables exps) [tables ~ exps] = + o <- oneOrNoRows q; + return (case o of + None => error <xml>Query returned no rows</xml> + | Some r => r) + diff --git a/lib/top.urs b/lib/top.urs index 22cebb16..6e9dda4e 100644 --- a/lib/top.urs +++ b/lib/top.urs @@ -116,3 +116,13 @@ val oneOrNoRows : tables ::: {{Type}} -> exps ::: {Type} [[nm] ~ acc] => [nm = $fields] ++ acc) [] tables)) + +val oneRow : tables ::: {{Type}} -> exps ::: {Type} + -> sql_query tables exps + -> fn [tables ~ exps] => + transaction + $(exps + ++ fold (fn nm (fields :: {Type}) acc + [[nm] ~ acc] => + [nm = $fields] ++ acc) + [] tables) diff --git a/tests/time.ur b/tests/time.ur index f66004a5..f81c59c3 100644 --- a/tests/time.ur +++ b/tests/time.ur @@ -7,7 +7,9 @@ fun main () = dml (INSERT INTO t (Id, Time) VALUES (42, {now})); xml <- queryX (SELECT * FROM t) (fn r => <xml>{[r.T.Id]}: {[r.T.Time]}<br/></xml>); + minMax <- oneRow (SELECT MIN(t.Time) AS Min, MAX(t.Time) AS Max FROM t); return <xml><body> {xml} - {[now]}, {[now = now]}, {[now = later]}, {[later < now]}, {[now < later]} + {[now]}, {[now = now]}, {[now = later]}, {[later < now]}, {[now < later]}<br/> + {[minMax.Min]}, {[minMax.Max]} </body></xml> |