I don't think my problem is database related.
Arno, did you see if the next value of your postgres sequence corresponded to
the value actually inserted?
I launched jboss in debug mode and attached eclipse remotely to it and found
the hibernate class which is applying modifications to the value returned from
the database sequence.
The generated id is being generated by org.hibernate.id.SequenceHiLoGenerator.
Here is the method.
public synchronized Serializable generate(SessionImplementor session,
Object obj)
| throws HibernateException {
| if (maxLo < 1) {
| //keep the behavior consistent even for boundary usages
| long val = ( (Number) super.generate(session, obj)
).longValue();
| if (val == 0) val = ( (Number) super.generate(session,
obj) ).longValue();
| return IdentifierGeneratorFactory.createNumber( val,
returnClass );
| }
| if ( lo>maxLo ) {
| long hival = ( (Number) super.generate(session, obj)
).longValue();
| lo = (hival == 0) ? 1 : 0;
| hi = hival * ( maxLo+1 );
| if ( log.isDebugEnabled() )
| log.debug("new hi value: " + hival);
| }
|
| return IdentifierGeneratorFactory.createNumber( hi + lo++,
returnClass );
| }
I would like to have the id, generated by org.hibernate.id.SequenceGenerator
instead of org.hibernate.id.SequenceHiLoGenerator. Is there a way to specify
the class which should be used as the generator?
I read some of the comments for both of these generators and it looks like the
HiLo version is used for performance. I believe it is able to reserve chunks of
sequence numbers at a time. But I was trying to created entity beans for an
existing database and still fit the same sequence/id usage pattern of the old
code.
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