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mazhar
 Post subject: querying inside the Interceptor onSave() method.
PostPosted: Tue Mar 24, 2009 12:52 pm 
Newbie

Joined: Wed Jan 28, 2009 9:57 am
Posts: 16
Location: Leinfelden, Germany
hello,

I have a requirement to query the DB for a sequence and append a string to it to form a business Id. This is not the technical Id, so I cannot use a generator tag in the mapping file.

Is it possible to execute a SQLQuery like "select CURRENT_SERVER from SYSIBM.SYSDUMMY1"?

Code inside the onSave():
Code:
String generationQuery =
                "SELECT CONCAT(SUBSTR(CURRENT_SERVER, 5, 2), DIGITS(999)) as GEN_VAL from SYSIBM.SYSDUMMY1";
            Session session = HibernateUtil.getSession();
            SQLQuery query = session.createSQLQuery(generationQuery).addScalar("GEN_VAL", Hibernate.STRING);
           
            String generatedId = (String) query.uniqueResult();

At the moment when I try to do this I get a NullPointerException at
Code:
query.uniqueResult()


Code:
java.lang.NullPointerException
   at org.hibernate.type.IntegerType.next(IntegerType.java:59)
   at org.hibernate.engine.Versioning.increment(Versioning.java:108)
   at org.hibernate.event.def.DefaultFlushEntityEventListener.getNextVersion(DefaultFlushEntityEventListener.java:365)
   at org.hibernate.event.def.DefaultFlushEntityEventListener.scheduleUpdate(DefaultFlushEntityEventListener.java:257)
   at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:128)
   at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:196)
   at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:76)
   at org.hibernate.event.def.DefaultAutoFlushEventListener.onAutoFlush(DefaultAutoFlushEventListener.java:35)
   at org.hibernate.impl.SessionImpl.autoFlushIfRequired(SessionImpl.java:969)
   at org.hibernate.impl.SessionImpl.listCustomQuery(SessionImpl.java:1690)
   at org.hibernate.impl.AbstractSessionImpl.list(AbstractSessionImpl.java:142)
   at org.hibernate.impl.SQLQueryImpl.list(SQLQueryImpl.java:152)
   at org.hibernate.impl.AbstractQueryImpl.uniqueResult(AbstractQueryImpl.java:811)
   at com.daimler.mbcpos.commons.infcmp.persistence.interceptors.HibernateSessionInterceptor.onSave(HibernateSessionInterceptor.java:54)
   at org.hibernate.event.def.AbstractSaveEventListener.substituteValuesIfNecessary(AbstractSaveEventListener.java:394)
   at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:270)
   at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:181)
   at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:121)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:172)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:94)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
   at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:507)
   at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:499)
   at org.hibernate.engine.CascadingAction$5.cascade(CascadingAction.java:218)
   at org.hibernate.engine.Cascade.cascadeToOne(Cascade.java:268)
   at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:216)
   at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:169)
   at org.hibernate.engine.Cascade.cascadeCollectionElements(Cascade.java:296)
   at org.hibernate.engine.Cascade.cascadeCollection(Cascade.java:242)
   at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:219)
   at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:169)
   at org.hibernate.engine.Cascade.cascade(Cascade.java:130)
   at org.hibernate.event.def.AbstractFlushingEventListener.cascadeOnFlush(AbstractFlushingEventListener.java:131)
   at org.hibernate.event.def.AbstractFlushingEventListener.prepareEntityFlushes(AbstractFlushingEventListener.java:122)
   at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:65)
   at org.hibernate.event.def.DefaultAutoFlushEventListener.onAutoFlush(DefaultAutoFlushEventListener.java:35)
   at org.hibernate.impl.SessionImpl.autoFlushIfRequired(SessionImpl.java:969)
   at org.hibernate.impl.SessionImpl.listCustomQuery(SessionImpl.java:1690)
   at org.hibernate.impl.AbstractSessionImpl.list(AbstractSessionImpl.java:142)
   at org.hibernate.impl.SQLQueryImpl.list(SQLQueryImpl.java:152)
   at org.hibernate.impl.AbstractQueryImpl.uniqueResult(AbstractQueryImpl.java:811)
   at com.daimler.mbcpos.commons.infcmp.persistence.interceptors.HibernateSessionInterceptor.onSave(HibernateSessionInterceptor.java:54)
   at org.hibernate.event.def.AbstractSaveEventListener.substituteValuesIfNecessary(AbstractSaveEventListener.java:394)
   at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:270)
   at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:181)
   at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:121)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)
   at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:172)
   at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
   at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:535)
   at org.hibernate.impl.SessionImpl.save(SessionImpl.java:523)
   at org.hibernate.impl.SessionImpl.save(SessionImpl.java:519)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:85)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:58)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:60)
   at java.lang.reflect.Method.invoke(Method.java:391)
   at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:301)
   at $Proxy0.save(Unknown Source)
   at com.daimler.mbcpos.commons.infcmp.persistence.PersistenceBaseDAO.save(PersistenceBaseDAO.java:79)
   at com.daimler.mbcpos.commons.infcmp.dbmodel.pcdh.dao.PersonDAO.updateCreatePerson(PersonDAO.java:68)
   at com.daimler.mbcpos.commons.infcmp.dbmodel.pcdh.dao.PersonDAOTest.testUpdateCreatePerson(PersonDAOTest.java:133)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:85)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:58)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:60)
   at java.lang.reflect.Method.invoke(Method.java:391)
   at junit.framework.TestCase.runTest(TestCase.java:154)
   at junit.framework.TestCase.runBare(TestCase.java:127)
   at junit.framework.TestResult$1.protect(TestResult.java:106)
   at junit.framework.TestResult.runProtected(TestResult.java:124)
   at junit.framework.TestResult.run(TestResult.java:109)
   at junit.framework.TestCase.run(TestCase.java:118)
   at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:128)
   at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)


Any help would be much appreciated.[/b]
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mazhar
 Post subject:
PostPosted: Mon Apr 06, 2009 11:19 am 
Newbie

Joined: Wed Jan 28, 2009 9:57 am
Posts: 16
Location: Leinfelden, Germany
Well it seems to me that executing a SQL (or HQL for that matter) query is not possible in this case. I tried quite a few things as a work around. The only thing that worked for me is to get the Connection from the Session and execute a prepareStatement() on it.

Code:
session.connection().prepareStatement(YOUR_NATIVE_SQL_QUERY);


Session.connection is deprecated, for more info see http://forum.hibernate.org/viewtopic.php?p=2381677

If your have to get rid of deprecated usage warnings you may use a cheat ;)

Code:
((SessionImplementor)session).connection().prepareStatement(YOUR_NATIVE_SQL_QUERY);
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