Question

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

Asked by: pvasha

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.



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;
	}

                                  
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Asked On
2008-12-06 at 02:31:19ID23962756
Tags

JSF

,

JBoss SEAM

,

EJB3.0

,

Hibernate

Topic

Enterprise Java Beans (EJB)

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Answers

 

by: pvashaPosted on 2008-12-07 at 01:22:56ID: 23115170

Hi,

We have worked a work arround for the scenario.
Currently we have the property CASCADE.ALL set for the Entity. CASCADE.ALL means combination of CASCADE.PERSIST, CASCADE.MERGE, CASCADE.DELETE, CASCADE.REFRESH. We replaced CASCADE.ALL with cascade = {MERGE, REMOVE, REFRESH}. This we did for all our relationships. While doing the same, just make sure that we do not use the method EntityManager.persist()

Hope this helps and can qualify to be added to the knowledge base.

Thanks

Prashant

20120131-EE-VQP-002

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