One solution that is database independent is to use Scott Ambler's High Low solution. In a nutshell:
- create a table named primary_keys(key_name varchar, next_value number/varchar) - populate the table with the names of your tables - create a stateless session bean that gets the next_value from your primary_keys table - have your entity beans call your session bean to get their next key value If you do a search on google for Scott Ambler (www.ronin.com) you should find the solution *somewhat* clearer. Damon On Thu, 2002-06-13 at 08:26, Javier A. Soltero wrote: > Do you or anyone else on this list have any suggestions about handling > this problem effectively (and portably for different DBs) in 3.0? > > Any suggestions would be appreciated. Currently, I'm guessing the only > way to accomplish this is to have a separate class which can look up the > next value in the sequence. > > thanks. > > -javier > > Dain Sundstrom wrote: > > That won't work with CMP. It does work with BMP if you are going that > > route. Unknown primary keys are are at the top of the new features > > list, so it will be at least a month. > > > > -dain > > > > Arthur Wang wrote: > > > >> I am using auto_increment function of MySql database for primary key of > >> entity bean , so I don't need to set pk in ejbCreate, mysql will > >> populate pk > >> field in the datatbase automatically, but it has following exceptions. > >> > >> -----Original Message----- > >> From: Dain Sundstrom [mailto:[EMAIL PROTECTED]] > >> Sent: Friday, June 07, 2002 4:35 PM > >> To: [EMAIL PROTECTED] > >> Subject: Re: [JBoss-user] Using auto increment of mysql for PK > >> > >> > >> You need to be more specific. What exactly did you try? > >> > >> -dain > >> > >> Arthur Wang wrote: > >> > >> > >>> Hi, > >>> I tried to use auto_increment for primary key when I create a new entity > >>> bean, but there are following exception: > >>> > >>> --------------------- > >>> HTTP ERROR: 500 removing bean lock and it has tx set!; nested exception > >>> > >> is: > >> > >>> java.lang.IllegalStateException: removing bean lock and it has tx set! > >>> Embedded Exception removing bean lock and it has tx set!; nested > >>> exception > >>> is: java.lang.IllegalStateException: removing bean lock and it has tx > >>> > >> set!; > >> > >>> nested exception is: javax.ejb.TransactionRolledbackLocalException: > >>> > >> removing > >> > >>> bean lock and it has tx set!; nested exception is: > >>> java.lang.IllegalStateException: removing bean lock and it has tx set! > >>> Embedded Exception removing bean lock and it has tx set!; nested > >>> exception > >>> is: java.lang.IllegalStateException: removing bean lock and it has tx > >>> set! > >>> ---------------- > >>> > >>> Any reply would be highly appreciated. > >>> thanks > >>> > >>> > >>> Arthur Wang > >>> Ensemble Systems Inc. > >>> Tel: (604)232-7954 Fax: (604)231-9545 > >>> www.ensemble-systems.com > >>> > >>> > >>> > >>> _______________________________________________________________ > >>> > >>> Don't miss the 2002 Sprint PCS Application Developer's Conference > >>> August 25-28 in Las Vegas - > >>> > >> http://devcon.sprintpcs.com/adp/index.cfm?source=osdntextlink > >> > >>> _______________________________________________ > >>> JBoss-user mailing list > >>> [EMAIL PROTECTED] > >>> https://lists.sourceforge.net/lists/listinfo/jboss-user > >>> > >>> > >> > >> > >> > >> _______________________________________________________________ > >> > >> Don't miss the 2002 Sprint PCS Application Developer's Conference > >> August 25-28 in Las Vegas - > >> http://devcon.sprintpcs.com/adp/index.cfm?source=osdntextlink > >> > >> _______________________________________________ > >> JBoss-user mailing list > >> [EMAIL PROTECTED] > >> https://lists.sourceforge.net/lists/listinfo/jboss-user > >> > >> _______________________________________________________________ > >> > >> Don't miss the 2002 Sprint PCS Application Developer's Conference > >> August 25-28 in Las Vegas - > >> http://devcon.sprintpcs.com/adp/index.cfm?source=osdntextlink > >> > >> _______________________________________________ > >> JBoss-user mailing list > >> [EMAIL PROTECTED] > >> https://lists.sourceforge.net/lists/listinfo/jboss-user > >> > > > > > > > > _______________________________________________________________ > > > > Don't miss the 2002 Sprint PCS Application Developer's Conference > > August 25-28 in Las Vegas - > > http://devcon.sprintpcs.com/adp/index.cfm?source=osdntextlink > > > > _______________________________________________ > > JBoss-user mailing list > > [EMAIL PROTECTED] > > https://lists.sourceforge.net/lists/listinfo/jboss-user > > > > > > _______________________________________________________________ > > Don't miss the 2002 Sprint PCS Application Developer's Conference > August 25-28 in Las Vegas - >http://devcon.sprintpcs.com/adp/index.cfm?source=osdntextlink > > _______________________________________________ > JBoss-user mailing list > [EMAIL PROTECTED] > https://lists.sourceforge.net/lists/listinfo/jboss-user -- Ranksix Solutions Inc. [EMAIL PROTECTED] 250.514.6616 _______________________________________________________________ Don't miss the 2002 Sprint PCS Application Developer's Conference August 25-28 in Las Vegas - http://devcon.sprintpcs.com/adp/index.cfm?source=osdntextlink _______________________________________________ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user
