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tbech
 Post subject: queries inside events - why it doesn't work?
PostPosted: Tue Mar 07, 2006 11:27 am 
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Joined: Fri Oct 28, 2005 7:11 am
Posts: 20
I try to use the events to check the database consistency (business rules).
Scenario:
- save object of type A
- preInsert event called - here I do query on currentSession
- save object of type A (but different than before).

Quote:
This gives exception:
aused by: org.hibernate.exception.GenericJDBCException: could not insert:
at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:91)
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:79)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2078)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2427)
at org.hibernate.action.EntityInsertAction.execute(EntityInsertAction.java:51)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:243)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:227)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:140)
at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:296)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1009)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:356)
at org.hibernate.transaction.CacheSynchronization.beforeCompletion(CacheSynchronization.java:59)
at org.jboss.tm.TransactionImpl.doBeforeCompletion(TransactionImpl.java:1473)
at org.jboss.tm.TransactionImpl.beforePrepare(TransactionImpl.java:1092)
at org.jboss.tm.TransactionImpl.commit(TransactionImpl.java:306)
... 63 more




Caused by: java.sql.SQLException: Connection handle has been closed and is unusable
at org.jboss.resource.adapter.jdbc.WrappedConnection.checkStatus(WrappedConnection.java:526)
at org.jboss.resource.adapter.jdbc.WrappedConnection.checkTransaction(WrappedConnection.java:513)
at org.jboss.resource.adapter.jdbc.WrappedStatement.checkTransaction(WrappedStatement.java:537)
at org.jboss.resource.adapter.jdbc.WrappedPreparedStatement.executeUpdate(WrappedPreparedStatement.java:223)
at org.hibernate.jdbc.NonBatchingBatcher.addToBatch(NonBatchingBatcher.java:23)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2062)
... 76 more


I tried to debug a little bit, and foound out that it could be similar to the post:
http://forum.hibernate.org/viewtopic.ph ... ht=batcher

Hibernate Version: 3.1.2
Any workaround? Or is it a bug?


Last edited by tbech on Wed Mar 08, 2006 5:50 am, edited 1 time in total.

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tbech
 Post subject:
PostPosted: Wed Mar 08, 2006 2:58 am 
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Beginner

Joined: Fri Oct 28, 2005 7:11 am
Posts: 20
To be more precise:
I use the 'preInsert' event to do some queries on the DB (in the same session - it is a must, becuase of the logic of the application).
Problem is that the query causes closing of connection which are supposed to be allocated for 'insert'.
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tbech
 Post subject:
PostPosted: Wed Mar 08, 2006 5:46 am 
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Joined: Fri Oct 28, 2005 7:11 am
Posts: 20
We've dig out more about events and we suspect the worst possible :(
1. You cannot use query in preInsert - reaction as above.
2. What anyone would expect from postInsert event?
That the record is already inserted in DB. No, not in Hibernate. Due to using of batcher and other stuff, the records are inserted/updated/deleted during flush (which comes at the end).
Exception: if two batches in the transaction (the first will be saved during prepareStatement in prepareBatchStatement, second during flush. Why so?


So what is the real usage pattern for event. We have choosen hibernate to achive two things by using events:
- to have preInsert/postInsert to do there some validation check (business rules);
- to do in postInsert/delete/update crateation of historical data in special historical tables.

So, are events designed for such requirement (simple one in fact: allow other queries during events)? And how to achieve this?
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tbech
 Post subject:
PostPosted: Mon Mar 27, 2006 3:19 am 
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Joined: Fri Oct 28, 2005 7:11 am
Posts: 20
The patch is in http://opensource.atlassian.com/project ... e/HHH-1578.
Unfortunately the anomaly is wrongly rejected.
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