Re: [JBoss-user] automatic primary key generation for CMP entityBeans?
[EMAIL PROTECTED] wrote: The generator I have in mind will increment the values. Where do you plan to store the values? Database? In the interfaces, I cant see some init(startValue) method or something similar. This method should be there and should be called on initializing the generator. Couldn't you initialize the generator in KeyGeneratorFactory.getKeyGenerator()? The UUIDGeneratorFactory returns a new instance of the generator every time. This is no problem with random keys, but for incrementing, I have to synchronize the multiple instances of the keygenerator in some way. Yes. Does somebody have any comments on that or can point me in the right direction ? Thanks in advance Do you know how the HiLo generators work? It seems to me it is what you need. --- This SF.net email is sponsored by: IBM Linux Tutorials. Become an expert in LINUX or just sharpen your skills. Sign up for IBM's Free Linux Tutorials. Learn everything from the bash shell to sys admin. Click now! http://ads.osdn.com/?ad_id=1278alloc_id=3371op=click ___ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user
Re: [JBoss-user] automatic primary key generation for CMP entityBeans?
I have seen the UUIDKeyGeneratorFactory, where can I find information about how to write my own factory ? I also need to know how to use entity-commands/how to use the default keygenerator. Thanks in advance, Stefan select max() is not safe. Look at standardjbosscmp-jdbc.xml file for entity-commands for avaliable key generations. [EMAIL PROTECTED] wrote: Hello, everyone I have a Entity Bean with a String as PK. The String consists of the characters [0-9]and[A-Z]. My approach is to get the latest key from the DB with an ejbSelect method(select MAX()). Is this safe, or is it possible that I assign accidentially the same PK to 2 entitys because the PK of the first one doenst show up in the DB while generating the second key ? Does JBoss have any sort of PK generator which I can configure ? Or can I use the auto-increment function of the Database (I want Jboss to create the tables). Thanks for any suggestion, Stefan --- This SF.net email is sponsored by: IBM Linux Tutorials. Become an expert in LINUX or just sharpen your skills. Sign up for IBM's Free Linux Tutorials. Learn everything from the bash shell to sys admin. Click now! http://ads.osdn.com/?ad_id=1278alloc_id=3371op=click ___ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user --- This SF.net email is sponsored by: IBM Linux Tutorials. Become an expert in LINUX or just sharpen your skills. Sign up for IBM's Free Linux Tutorials. Learn everything from the bash shell to sys admin. Click now! http://ads.osdn.com/?ad_id=1278alloc_id=3371op=click ___ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user --- This SF.net email is sponsored by: IBM Linux Tutorials. Become an expert in LINUX or just sharpen your skills. Sign up for IBM's Free Linux Tutorials. Learn everything from the bash shell to sys admin. Click now! http://ads.osdn.com/?ad_id=1278alloc_id=3371op=click ___ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user
Re: [JBoss-user] automatic primary key generation for CMP entityBeans?
[EMAIL PROTECTED] wrote: I have seen the UUIDKeyGeneratorFactory, where can I find information about how to write my own factory ? You need to implement two interfaces: org.jboss.ejb.plugins.keygenerator.KeyGeneratorFactory and org.jboss.ejb.plugins.keygenerator.KeyGenerator. Check the org.jboss.ejb.plugins.keygenerator.uuid for an example. This is in the server module. Count on my guidance. We are interested in contributions. I also need to know how to use entity-commands/how to use the default keygenerator. A field that should use a generator is marked with auto-increment/ in jbosscmp-jdbc.xml. And the entity that has an auto-incremented field should have an entity-command element that says what generation is used for that field. For example, the command that uses a key-generator is !-- uses key generator to fetch the next key value -- entity-command name=key-generator class=org.jboss.ejb.plugins.cmp.jdbc.keygen.JDBCKeyGeneratorCreateCommand attribute name=key-generator-factoryUUIDKeyGeneratorFactory/attribute /entity-command The UUIDKeyGeneratorFactory is the JNDI name under which the key generator factory is bound. The UUID key generator is an MBean that is bound into the JNDI on the start. It produces String values. Thanks in advance, Stefan --- This SF.net email is sponsored by: IBM Linux Tutorials. Become an expert in LINUX or just sharpen your skills. Sign up for IBM's Free Linux Tutorials. Learn everything from the bash shell to sys admin. Click now! http://ads.osdn.com/?ad_id=1278alloc_id=3371op=click ___ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user
Re: [JBoss-user] automatic primary key generation for CMP entityBeans?
I have seen the UUIDKeyGeneratorFactory, where can I find information about how to write my own factory ? You need to implement two interfaces: org.jboss.ejb.plugins.keygenerator.KeyGeneratorFactory and org.jboss.ejb.plugins.keygenerator.KeyGenerator. Check the org.jboss.ejb.plugins.keygenerator.uuid for an example. This is in the server module. Count on my guidance. We are interested in contributions. Thank you very much! I will take alook at this, I have to check with my boss, maybe we can contribute the generator. I also need to know how to use entity-commands/how to use the default keygenerator. A field that should use a generator is marked with auto-increment/ in jbosscmp-jdbc.xml. And the entity that has an auto-incremented field should have an entity-command element that says what generation is used for that field. For example, the command that uses a key-generator is !-- uses key generator to fetch the next key value -- entity-command name=key-generator class=org.jboss.ejb.plugins.cmp.jdbc.keygen.JDBCKeyGeneratorCreateCommand attribute name=key-generator-factoryUUIDKeyGeneratorFactory/attribute /entity-command The UUIDKeyGeneratorFactory is the JNDI name under which the key generator factory is bound. The UUID key generator is an MBean that is bound into the JNDI on the start. It produces String values. --- This SF.net email is sponsored by: IBM Linux Tutorials. Become an expert in LINUX or just sharpen your skills. Sign up for IBM's Free Linux Tutorials. Learn everything from the bash shell to sys admin. Click now! http://ads.osdn.com/?ad_id=1278alloc_id=3371op=click ___ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user
Re: [JBoss-user] automatic primary key generation for CMP entityBeans?
I have seen the UUIDKeyGeneratorFactory, where can I find information about how to write my own factory ? You need to implement two interfaces: org.jboss.ejb.plugins.keygenerator.KeyGeneratorFactory and org.jboss.ejb.plugins.keygenerator.KeyGenerator. Check the org.jboss.ejb.plugins.keygenerator.uuid for an example. This is in the server module. Count on my guidance. We are interested in contributions. The generator I have in mind will increment the values. In the interfaces, I cant see some init(startValue) method or something similar. This method should be there and should be called on initializing the generator. The UUIDGeneratorFactory returns a new instance of the generator every time. This is no problem with random keys, but for incrementing, I have to synchronize the multiple instances of the keygenerator in some way. Does somebody have any comments on that or can point me in the right direction ? Thanks in advance Stefan --- This SF.net email is sponsored by: IBM Linux Tutorials. Become an expert in LINUX or just sharpen your skills. Sign up for IBM's Free Linux Tutorials. Learn everything from the bash shell to sys admin. Click now! http://ads.osdn.com/?ad_id=1278alloc_id=3371op=click ___ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] automatic primary key generation for CMP entityBeans ?
Hello, everyone I have a Entity Bean with a String as PK. The String consists of the characters [0-9]and[A-Z]. My approach is to get the latest key from the DB with an ejbSelect method(select MAX()). Is this safe, or is it possible that I assign accidentially the same PK to 2 entitys because the PK of the first one doenst show up in the DB while generating the second key ? Does JBoss have any sort of PK generator which I can configure ? Or can I use the auto-increment function of the Database (I want Jboss to create the tables). Thanks for any suggestion, Stefan --- This SF.net email is sponsored by: IBM Linux Tutorials. Become an expert in LINUX or just sharpen your skills. Sign up for IBM's Free Linux Tutorials. Learn everything from the bash shell to sys admin. Click now! http://ads.osdn.com/?ad_id=1278alloc_id=3371op=click ___ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user
Re: [JBoss-user] automatic primary key generation for CMP entityBeans ?
select max() is not safe. Look at standardjbosscmp-jdbc.xml file for entity-commands for avaliable key generations. [EMAIL PROTECTED] wrote: Hello, everyone I have a Entity Bean with a String as PK. The String consists of the characters [0-9]and[A-Z]. My approach is to get the latest key from the DB with an ejbSelect method(select MAX()). Is this safe, or is it possible that I assign accidentially the same PK to 2 entitys because the PK of the first one doenst show up in the DB while generating the second key ? Does JBoss have any sort of PK generator which I can configure ? Or can I use the auto-increment function of the Database (I want Jboss to create the tables). Thanks for any suggestion, Stefan --- This SF.net email is sponsored by: IBM Linux Tutorials. Become an expert in LINUX or just sharpen your skills. Sign up for IBM's Free Linux Tutorials. Learn everything from the bash shell to sys admin. Click now! http://ads.osdn.com/?ad_id=1278alloc_id=3371op=click ___ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user --- This SF.net email is sponsored by: IBM Linux Tutorials. Become an expert in LINUX or just sharpen your skills. Sign up for IBM's Free Linux Tutorials. Learn everything from the bash shell to sys admin. Click now! http://ads.osdn.com/?ad_id=1278alloc_id=3371op=click ___ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user
