Mercurial > urweb
view tests/sql_option.ur @ 1205:7cd11380cdf1
WHERE-dependent checking
author | Adam Chlipala <adamc@hcoop.net> |
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date | Sun, 04 Apr 2010 17:18:41 -0400 (2010-04-04) |
parents | 4efab85405be |
children |
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table t : { O : option int } fun addNull () = dml (INSERT INTO t (O) VALUES (NULL)); return <xml>Done</xml> fun add3 () = dml (INSERT INTO t (O) VALUES ({Some 3})); return <xml>Done</xml> fun addN r = dml (INSERT INTO t (O) VALUES ({Some (readError r.N)})); return <xml>Done</xml> fun main () : transaction page = xml <- queryX (SELECT * FROM t) (fn r => case r.T.O of None => <xml>Nada<br/></xml> | Some n => <xml>Num: {[n]}<br/></xml>); return <xml><body> {xml} <a link={addNull ()}>Add a null</a><br/> <a link={add3 ()}>Add a 3</a><br/> <form> Add <textbox{#N}/> <submit action={addN}/> </form> </body></xml>