Hey all,
i'm new in jdo and castor ! Now i've persist my first data. Read and
insert works, but there is a problem with update. I wan't optimistic
Locking.
I do something like this:
private void update(BaseVO baseVo) throws ...
{
try
{
db = jdo.getDatabase();
db.begin();
OQLQuery query = getQuery(baseVo.getId());
QueryResults results = query.execute();
BaseVO baseVoFromDB = (BaseVO)results.next();
Integer version = baseVo.getVersion();
Integer versionInDB = baseVoFromDB.getVersion();
if( ! version.equals( versionInDB ) )
{
System.out.println("Version in DB: " + versionInDB );
System.out.println("Version in RAM: " + version );
throw new OptimisticLockingException();
}
int primitiveVersion = version.intValue();
baseVo.setVersion( new Integer( ++primitiveVersion ) );
// HERE IS THE PROBLEM !!!
baseVoFromDB = baseVo;
// DO I HAVE TO MAP ALL ATTRIBUTES ?? OR IS THERE ANY OTHER WAY ?
db.commit();
db.close();
}
catch (PersistenceException e)
{
throw new ...
}
}
The errormessage says something about timestampable objects !!! Where
can i read more about it ?
Fredy
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