properly way to lookup a java.sql.Connection from the connection pool
dear ojb user group, could you kindly tell me the properly way to look a connection from the connection pool? i have used the following call, but i get a socked closed exception. Connection conn = pBroker.serviceConnectionManager().getConnection(); 2004-01-27 10:45:46,609 [RMI TCP Connection(126)-162.86.116.94] ERROR [com.server.TBean] java.sql.SQLException: Io exception: Socket closed your assistance is much appreciated, chris - Do you Yahoo!? Yahoo! SiteBuilder - Free web site building tool. Try it!
java.lang.ClassNotFoundException: org.apache.ojb.broker.util.collections.RemovalAwareCollection
Dear OJB User Group, I am using OJB in jboss and making an EJB connection to the server and it seems like the client application is trying to down a server side class. Any suggestion as to what can be the problem that cause the rmi classloader to reference the RemovalAwareCollection. Is ojb always returning a java.util.Collection? I see a ManageableCollection class in the broker package? Does that have anything to do with it? Thank you in advance for you much needed reply. Sincerely, Chris - Do you Yahoo!? Yahoo! Hotjobs: Enter the "Signing Bonus" Sweepstakes
does QueryBySQL work?
Dear OJB user group, Is QueryBySQL supported? if so, are there any limitations? thank you, chris - Do you Yahoo!? The New Yahoo! Shopping - with improved product search
problem mapping differnent object to one table
has anyone been successfully mapping two objects to the same table?? to be more specific, i would like distinct object instances for objectAId and distinct object instances for objectBId in seperate queries. select distinct objectA_id from tableAB; select distinct objectB_id from tableAB; i have used the distinct clause on the QueryCriteria class but i have not been successfully, because OJB wants to concatenate objectAId and objectBid together in the following sql; select distinct objectA_id, objectB_id from tableAB; why does OJB combine objectA_id and objectB_id in the select clause of the query if two class descriptors exist for the same table? i did try the reportQuery to restrict the columns. i got the sql that is generated seems to be correct. however ojb is throwing an invalid class cast exception which i don't understand. any thoughts are much appreciated? - Do you Yahoo!? The New Yahoo! Shopping - with improved product search
dynamic database connections and schemas
dear ojb user list,
i was asked to describe my thoughts about dynamic database connections and schemas.
See below,
chris tava
let's suppose you are tasked with writing data to multiple databases accounts with the
same schema. let's call the schema, the v1.0.0 schema.
when i use the word schema i am refering to the physcial model - relational database
model. obviously, using the OJB tool you can create an object.attribute to relational
table.column map (O-R map). and you can use the PBKey class to make a connection to
any account using a specific O-R map.
PBKey pbKey = new PBKey("v1.0.0",getAccountName(), getAccountPass());
PersistenceBroker pBroker = pBrokerFactory.createPersistenceBroker(pbKey);
now, let's suppose the next version of the system comes out and you have a new
database schema, let's call the v2.0.0 schema. and let's suppose only a few of the
database accounts are updated at a given time.
therefore, if you have some key identifier in your system that determines which
version of the schema at particular database account is using, then you can use this
information to make a connection to the specific database accounts using specific
schemas.
if (schemaVersion.equals("v1.0.0") {
PBKey pbKey = new PBKey("v1.0.0",
getAccountName(),getAccountPass());
}
else if (schemaVersion.equals("v2.0.0") {
PBKey pbKey = new PBKey("v2.0.0",
getAccountName(),getAccountPass());
}
-
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huge fan of ojb, huge
I worked through all of the gory details of getting ojb wired into jboss. i know have a dynamic persistence mechanism that writes data to any schema on the fly. i don't think cmp supports that! great job guys!!! I am going to read more ojb source to see if i can contribute... __ Do you Yahoo!? SBC Yahoo! DSL - Now only $29.95 per month! http://sbc.yahoo.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
java.lang.LinkageError: loader constraints violated when linking javax/transaction/Synchronization class
I am trying to get a PersistenceBroker from a SessionBean w/ the database configured in the repository_database.xml file. I have followed the deployment instructions to the T and I double checked it to no avail. It seems like I have made progress but the Jboss transaction manager is not happy. Any thoughts? pBrokerFactory.getInstance().defaultPersistenceBroker(); java.lang.LinkageError: loader constraints violated when linking javax/transaction/Synchronization class at org.jboss.tm.TxCapsule.(TxCapsule.java:152) at org.jboss.tm.TxCapsule.getInstance(TxCapsule.java:124) at org.jboss.tm.TxManager.begin(TxManager.java:113) at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:158) at org.jboss.ejb.plugins.TxInterceptorCMT.invokeHome(TxInterceptorCMT.java:52) at org.jboss.ejb.plugins.SecurityInterceptor.invokeHome(SecurityInterceptor.java:105) at org.jboss.ejb.plugins.LogInterceptor.invokeHome(LogInterceptor.java:129) at org.jboss.ejb.StatelessSessionContainer.invokeHome(StatelessSessionContainer.java:300) at org.jboss.ejb.Container.invoke(Container.java:730) at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:517) at __ Do you Yahoo!? SBC Yahoo! DSL - Now only $29.95 per month! http://sbc.yahoo.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
rc3 valid archive?
Is this a valid archive? http://db.apache.org/builds/ojb/1.0.rc3/db-ojb-1.0.rc3-src.tar because I get a I/O error with the tar -x command. what about the winzip format? - Do you Yahoo!? SBC Yahoo! DSL - Now only $29.95 per month!
