http://n2.nabble.com/file/n3267829/dump.rar dump.rar
Hi All,
Thank you very much for paying attention to my problem. In spite of it works
with Hibernate, I don't like the idea to use another JPA and have pretty
many additional libs on board. I would like to fix the issue with OpenJPA
and use it since it's embedded in WebSphere server, at least.
The code is extremely simple and clear. Stateless bean just returns
query.getResultList() to struts2 action , which puts it in request object
for displaytag grid. The whole time spends in query.getResultList() method.
I’ve tried once more to remove IFilterTO and Map from Account object, but
with no result.
I put asterisks before and after query.getResultList(), switched on runtime
trace, and attached result log. It’s pretty detailed, with many openjpa
runtime parameters and actions, may be somebody will be able to determine
what is happening…
Database is ORACLE10, detailed version is present in attached log file –
openJPA determined it correctly. Tables are created automatically by OpenJPA
using the following property in persistence.xml :
<properties>
<property name="openjpa.jdbc.SynchronizeMappings"
value="buildSchema"/>
</properties>
IFilterTO interface just has two methods , nothing special :
public interface IFilterTO {
void setValue( String key, String value );
String getValue( String key );
}
Thank you all in advance for your help.
Mikhail
Craig L Russell wrote:
>
> Hi,
>
> Could I ask again what the code is doing, following the
> query.getResultList() ?
>
> Where is the list of results being used? Are the results being
> serialized or detached?
>
> Thanks,
>
> Craig
>
> On Jul 15, 2009, at 12:19 AM, om wrote:
>
>>
>> Hi All!
>>
>> I’m new in openJPA, and didn’t manage to get over the problem with
>> simple
>> select statement for one object after a few days of investigation.
>> Please
>> help!
>>
>> For simple select from one object, OpenJPA ( same strategy for 1.0,
>> 1.2.1,
>> 2.0 ) fist generates right query to retrieve all rows and fields,
>> and then
>> start generating query per object by primary key.
>>
>> Code :
>> StringBuffer queryBuf = new StringBuffer("SELECT a FROM Account
>> AS a
>> WHERE a.date = :date ");
>> PersistenceProviderImpl impl = new PersistenceProviderImpl();
>> OpenJPAEntityManagerFactory fac =
>> impl.createEntityManagerFactory("MainPersistence",
>> System.getProperties());
>> OpenJPAEntityManager man = fac.createEntityManager();
>>
>> Query query = man.createQuery(queryBuf.toString());
>> query.setParameter("date", reportDate);
>> List res = query.getResultList();
>>
>>
>> LOG TRACE
>>
>> [7/14/09 16:57:50:475 MSD] R 266 MainPersistence TRACE
>> openjpa.Runtime -
>> Query "SELECT a FROM Account AS a WHERE a.date = :date " is cached
>> as target
>> query "null"
>> [7/14/09 16:57:50:475 MSD] R 266 MainPersistence TRACE
>> openjpa.Query -
>> Executing query: [SELECT a FROM Account AS a WHERE a.date = :date]
>> with
>> parameters: {date=java.util.GregorianCalendar[]}
>> [7/14/09 16:57:50:475 MSD] R 266 MainPersistence TRACE
>> openjpa.jdbc.SQL
>> - <t 1495423266, conn 1329090360> executing prepstmnt 1388597956
>> SELECT
>> t0.id, t0.version, t0.cur_code, t0.acc_date, t0.mask, t0.acc_name,
>> t0.acc_seq, t0.value FROM ACCOUNT t0 WHERE (t0.acc_date = ?)
>> [params=(Timestamp) 2009-07-03 00:00:00.0]
>> [7/14/09 16:57:50:553 MSD] R 344 MainPersistence TRACE
>> openjpa.jdbc.SQL -
>> <t 1495423266, conn 1329090360> [78 ms] spent
>>
>> [7/14/09 16:57:50:553 MSD] R 344 MainPersistence TRACE
>> openjpa.jdbc.SQL -
>> <t 1495423266, conn 1329090360> executing prepstmnt 139855958 SELECT
>> t0.mask, t0.acc_name, t0.acc_seq, t0.value FROM ACCOUNT t0 WHERE
>> t0.id = ?
>> [params=(long) 328]
>> [7/14/09 16:57:50:631 MSD] R 422 MainPersistence TRACE
>> [WebContainer : 2]
>> openjpa.jdbc.SQL - <t 1495423266, conn 1329090360> [78 ms] spent
>> [7/14/09 16:57:50:631 MSD] R 422 MainPersistence TRACE
>> [WebContainer : 2]
>> openjpa.jdbc.SQL - <t 1495423266, conn 1329090360> executing prepstmnt
>> 646850190 SELECT t0.mask, t0.acc_name, t0.acc_seq, t0.value FROM
>> ACCOUNT t0
>> WHERE t0.id = ? [params=(long) 329]
>> [7/14/09 16:57:50:709 MSD] R 500 MainPersistence TRACE
>> [WebContainer : 2]
>> openjpa.jdbc.SQL - <t 1495423266, conn 1329090360> [78 ms] spent
>> [7/14/09 16:57:50:709 MSD] R 500 MainPersistence TRACE
>> [WebContainer : 2]
>> openjpa.jdbc.SQL - <t 1495423266, conn 1329090360> executing prepstmnt
>> 2146074602 SELECT t0.mask, t0.acc_name, t0.acc_seq, t0.value FROM
>> ACCOUNT t0
>> WHERE t0.id = ? [params=(long) 330]
>> [7/14/09 16:57:50:787 MSD] R 578 MainPersistence TRACE
>> [WebContainer : 2]
>> openjpa.jdbc.SQL - <t 1495423266, conn 1329090360> [78 ms] spent
>> ………………………………..
>>
>>
>> I need just list of detached objects to show it in grid. As it’s
>> seen from
>> log trace above, first query is enough to return all necessary
>> objects and
>> fields.
>> Why OpenJPA makes select per object after that? In this case simple
>> code
>> above works 37 seconds for retrieving 440 rows, since same jdbc
>> select and
>> wrap works 1.5 sec. I’ve tried different query hints and a few openjpa
>> versions, but with no result.
>>
>>
>> --
>> View this message in context:
>> http://n2.nabble.com/openJPA-generates-select-per-row---impossible-to-use-for-simple-select-statements-tp3261512p3261512.html
>> Sent from the OpenJPA Users mailing list archive at Nabble.com.
>
> Craig L Russell
> Architect, Sun Java Enterprise System http://db.apache.org/jdo
> 408 276-5638 mailto:[email protected]
> P.S. A good JDO? O, Gasp!
>
>
>
>
--
View this message in context:
http://n2.nabble.com/openJPA-generates-select-per-row---impossible-to-use-for-simple-select-statements-tp3261512p3267829.html
Sent from the OpenJPA Users mailing list archive at Nabble.com.
