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From "Bertelsen, Mattias" <mbertel...@pointserve.com>
Subject read-write cache with external transaction manager
Date Fri, 17 Nov 2006 21:33:47 GMT
We're having a problem with read-write non-serializable caching, using
an external transaction manager (JTA) and JBoss's local-tx datasource.
This refers to iBATIS 2.1.7.597 and the docs that shipped with it.

 

In the pdf Data Mapper Developer Guide, it says that with a read-write
cache, caching will only happen within each session.  It also is
mentioned in the pdf as well as the javadoc for the SqlMapClient that
the SqlMapClient is supposed to handle a session per thread
automatically.  So I assume that I should see caching associated with
each thread using a SqlMapClient without needing to explicitly manage
the sesssions.  However, we see different caching behavior when
explicitly using sessions from when we don't:

 

In our test code, we find that the following usage results in only one
SQL PreparedStatement being executed (the second apparently does hit the
cache):

 

                                    utx.begin();

                                    if (id > 0) {

                                        SqlMapSession session1 =
sqlMap.openSession();

                                        server = (ServerInfo)
session1.queryForObject("ServerInfo.getServer", id);

                                        server = (ServerInfo)
session1.queryForObject("ServerInfo.getServer", id);

                                        session1.close();

                                    }

                                    utx.commit();

 

While the following code shows two SQL PreparedStatements being
executed:

 

                                    utx.begin();

                                    if (id > 0) {


                                        server = (ServerInfo)
sqlMap.queryForObject("ServerInfo.getServer", id);

                                        server = (ServerInfo)
sqlMap.queryForObject("ServerInfo.getServer", id);

                                    }

                                    utx.commit();

 

 

Are we missing something?  Is this a bug, or did we just not understand
how the sqlMap's "automatic" session management is supposed to work for
us?

 

Thanks,

Mattias Bertelsen


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