Re: Hibernate 3.0

I should have mentioned I'm trying to get the Hibernate example to work. 
  I set the DB properties for Mckoi.  It gets this error after creating 
the sample tables and when it attempts to insert some test data.

Chas Douglass

James wrote:
> Mckoi has serializable isolation level which can give
> unexpected behavior if you are used to read commited
> isolation.
> 
> If a connection is sitting in a connection pool for a
> period of time keep in mind that it is actually in a
> transaction that started with the last
> commit/rollback.  This in turn means that it has and
> is working on an image of the database as existed at
> the end of that last transaction, when it was used by
> a previous Hibernate session object.
> 
> So, I don't know if a Hibernate session object, upon
> creation, does a commit/rollback on it's connection
> before proceeding to do whatever it is going to do. 
> If it doesn't, then the image of the database it is
> working on could be rather old--seconds or minutes or
> more.  If the schema has been changed in the mean
> time, by another connection, then upon a commit there
> will be a Serializable Transaction Conflict.
> 
> At least this is my understanding, so please correct
> if anyone disagrees.
> 
> Jim
> 
> 
> 
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