[jboss-user] [EJB3] - Re: Dinamically switch DataSource in EJB3 application

Viggo Navarsete [http://community.jboss.org/people/viggo.navarsete] created the discussion "Re: Dinamically switch DataSource in EJB3 application" To view the discussion, visit: http://community.jboss.org/message/574235#574235 -------------------------------------------------------------- Hi, if you know the JNDI names of the datasources that you want to switch between, you can do it like this: private Map<String, EntityManager> cachedEntityManagerMap = new HashMap<String, EntityManager>(); // cached EntityManagers private EntityManager getEntityManager() { String jndiName = "java:/something/someDS"; // TODO: Here you need to determine the JNDI name of the DataSource you want to switch to! log.info( "Change datasource to '" + jndiName + "'" ); if( cachedEntityManagerMap.containsKey( jndiName ) ) { // if already created, return a cached version instead of creating a new log.debug( "Return cached EntityManager with jndiName '" + jndiName + "'" ); return cachedEntityManagerMap.get( jndiName ); } else { log.debug( "Return new EntityManager with jndiName '" + jndiName + "'" ); /* * See "Hibernate Entity Manager User Guide", chapter "Bootstrapping" for more examples of what to override in * the map */ Map<String, String> emMap = new HashMap<String, String>(); emMap.put( "javax.persistence.jtaDataSource", jndiName ); EntityManager em = Persistence.createEntityManagerFactory( "somePU", emMap ) .createEntityManager(); cachedEntityManagerMap.put( jndiName, em ); return em; } private EntityManager getEntityManager() { String jndiName = "java:/something/someDS"; // TODO: Here you need to determine the JNDI name of the DataSource you want to switch to! log.info( "Change datasource to '" + jndiName + "'" ); if( cachedEntityManagerMap.containsKey( jndiName ) ) { // if already created, return a cached version instead of creating a new log.debug( "Return cached EntityManager with jndiName '" + jndiName + "'" ); return cachedEntityManagerMap.get( jndiName ); } else { log.debug( "Return new EntityManager with jndiName '" + jndiName + "'" ); /* * See "Hibernate Entity Manager User Guide", chapter "Bootstrapping" for more examples of what to override in * the map */ Map<String, String> emMap = new HashMap<String, String>(); emMap.put( "javax.persistence.jtaDataSource", jndiName ); EntityManager em = Persistence.createEntityManagerFactory( "somePU", emMap ) .createEntityManager(); cachedEntityManagerMap.put( jndiName, em ); return em; } } -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/574235#574235] Start a new discussion in EJB3 at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]