Solution ! Ok, I am so glad, I was able to do the backup with the following
command sequence:
'''java
if (FilesOnUSB.file != null) {
//get Session from the unwrap method of our persistenceUnit
'entityManager'
Session session = entityManager.unwrap(Session.class);
// Begin of a sql query n the session
session.beginTransaction();
// create data consistent call of backup command of h2 and
execute it directly
session.createSQLQuery("BACKUP TO
\'/media/usb/erestau.zip\'").executeUpdate();
// finalize sql query, flush session
session.getTransaction().commit();
session = null;
}
'''
Now the database was saved, even though it seems a perfect copy of what I
get by my plane file copy. But this is the guaranteed way of a data
consistent database at that time!
*This is my final question: Is this now fail safe copy which can in every
case reproduce the state of the database at that time. What are the ways to
enforce this?*
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