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Fix condition for installing new cache entries
author Adam Chlipala <adam@chlipala.net>
date Thu, 19 Nov 2015 16:02:04 -0500
parents 8be54d7bd06e
children
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table tab : {Id : int, Val : int} PRIMARY KEY Id

fun check id =
    res <- oneOrNoRows (SELECT tab.Val FROM tab WHERE tab.Id = {[id]});
    return <xml><body>
      Value at {[id]} is
      {case res of
           None => <xml>unknown</xml>
         | Some row => <xml>{[row.Tab.Val]}</xml>}.
    </body></xml>

fun flush id =
    dml (UPDATE tab SET Val = Val + 1 WHERE Id = {[id]});
    return <xml><body>
      Incremented value at {[id]} (if it exists).
    </body></xml>