Hi Jane, ----- Original Message ----- From: <[EMAIL PROTECTED]> To: "OJB Users List" <[EMAIL PROTECTED]> Sent: Friday, November 15, 2002 5:31 PM Subject: Question ODMG transaction in tutorial 2
> > Hi All, > > I am new to OJB. While studying the tutorial code, I noticed that all > queries were excuted inside transaction. For example, the > org.apache.ojb.tutorial2.UCListAllProducts excute a query that retrieve all > the products. Why is transaction necessary for read only operations? I > tried to remove the transaction and the code still worked. If you execute your query within a tx, all retrieved objects will become a read-lock on ODMG level by default (see OJB.properties 'ImplicitLocking' ). Without tx no read locks will be established (faster, "unsafe"), independent from OJB.properties 'ImplicitLocking' property. regards, Armin > But I'd like to > find out if there is anything I miss by taking the query out of the > transaction. > > Many thanks for your help, > > Jane > > > -- > To unsubscribe, e-mail: <mailto:ojb-user-unsubscribe@;jakarta.apache.org> > For additional commands, e-mail: <mailto:ojb-user-help@;jakarta.apache.org> > > > -- To unsubscribe, e-mail: <mailto:ojb-user-unsubscribe@;jakarta.apache.org> For additional commands, e-mail: <mailto:ojb-user-help@;jakarta.apache.org>
