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6.4

Delete, Insert, Update using EJB3.0 EntityManager of new Entity Instances along with existing Entity Instances

Asked by pvasha in Enterprise Java Beans (EJB)

Tags: JSF, JBoss SEAM, EJB3.0, Hibernate

Hi
we have done the following steps for updating the existing records into the database.
step:1 we have fetched the entity object from the database. there would be some set of records.
step 2. we have created a new entity object populated data by reading from corba service, in this new entity object there also would be set of records which might having same set of data or additional record or less records compared with the existing entity object.
step 3: Now we need to update the database with the a newly created entity object in such a manner that the existing record in the database has to be updated, new record which has to inserted added in the new entity object list, remove the record which is not in the new entity object list.

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             public ApplicationRO updateContractPartnerAnil(ApplicationStateDO applicationStateDO) {
		
		Query query;
		ApplicationRO applicationRO = new ApplicationRO();
		
		// Reading data from data base
		ApplicationState existingApplicationState;
		
		query = em.createNamedQuery("ApplicationState.FindByApplicationNo");
		query.setParameter("theApplicationNumber", applicationStateDO.getApplicationNumber());
		query.setParameter("theApplicationVersionSeqNumber", applicationStateDO.getApplicationVersionSeqNumber());
		
		existingApplicationState = (ApplicationState) query.getSingleResult();
		List<ContractPartnerApplicationState> existingCPASList = existingApplicationState.getContractPartnerApplicationStateList();
		
		//Reading data from corba		
		ApplicationState newApplicationState = (ApplicationState) PartnerApplicationMapper.mapApplicationStateDoToApplicationStateEntity(applicationStateDO);
		List<ContractPartnerApplicationState> newCPASList = newApplicationState.getContractPartnerApplicationStateList();
		
		//int existingSize = existingCPASList.size();
		. . . . . .
. . . . . .
for ( . . . .  ). . . .
. . . . . . 
	 	. . . . . .
		// we need to know how to compare and update the existing application state entity object list with the new application state object list and do the merge/remove/persist on the existing application object so that insert update and delete happens accordingly
		em.merge(existingApplicationState); ????
		
		. . . .  .. 
		
		return applicationRO;
	}

           
         

20091111-EE-VQP-91 - Hierarchy / EE_QW_2_20070628

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Delete, Insert, Update using EJB3.0 EntityManager of new Entity Instances along with existing Entity Instances

Asked by pvasha in Enterprise Java Beans (EJB)

Tags: JSF, JBoss SEAM, EJB3.0, Hibernate

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