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view caching-tests/test.ur @ 2225:6262dabc08d6

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Simplify example.
author Ziv Scully <ziv@mit.edu>
date Fri, 27 Mar 2015 11:19:15 -0400
parents 278e10629ba1
children 2f7ed04332a0
line wrap: on
line source
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>