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|
table tab : {Id : int, Val : int} PRIMARY KEY Id
fun cache id =
res <- oneOrNoRows (SELECT tab.Val
FROM tab
WHERE tab.Id = {[id]});
return <xml><body>
Reading {[id]}.
{case res of
None => <xml>?</xml>
| Some row => <xml>{[row.Tab.Val]}</xml>}
</body></xml>
fun flush id =
res <- oneOrNoRows (SELECT tab.Val
FROM tab
WHERE tab.Id = {[id]});
(case res of
None => dml (INSERT INTO tab (Id, Val)
VALUES ({[id]}, 0))
| Some row => dml (UPDATE tab
SET Val = {[row.Tab.Val + 1]}
WHERE Id = {[id]}));
return <xml><body>
{case res of
None => <xml>Initialized {[id]}!</xml>
| Some row => <xml>Incremented {[id]}!</xml>}
</body></xml>
|
