Hi, ----- Original Message ----- From: "Farnea Massimiliano" <[EMAIL PROTECTED]> To: "ojb-user" <[EMAIL PROTECTED]> Sent: Monday, September 29, 2003 6:10 PM Subject: Questions: High/Low Sequence Manager
> Hi all, > > I'm using in my application two implementation (extension) of the > SequenceManagerHighLowImpl, one for managing primary keys and the last for > generating an application protocol number sequence. I've choosen the > SequenceManagerHighLowImpl because I might have more than a JVM pointing the > same db. I have a couple of questions: > 1. I can't understand the meaning of the grabSize parameter, can I set it to > '1' (the protocol number sequence have to be continous) ? Any concurrency > issues? It's not granteed that the generated sequence keys are continuous. If e.g. an store fails, obtained keys are lost (2,3,4,5,8,9...). But they are unique. The 'grabSize' attribute specify the number of keys ask for from an intern DB-table (OJB_HL_SEQ). See http://db.apache.org/ojb/sequencemanager.html#High/Low sequence manager and have a look in the source code. > 2. The sequence-name for my implementations are diffent, one is referenced > only in the repository.xml, while I got direct access to the second in my > application code. Sorry, I don't understand that. Can you explain more. regards, Armin > Are there any problems/advices in using two database > driver sequence manager on the same db. > Thanks in advance for your suggestions. > > Massimiliano Farnea > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
