merge « Session « JPA Q&A

1. Hibernate : Downside of merge() over update()    stackoverflow.com

I'm having problems with a NonUniqueObjectException thrown by Hibernate. Reading the docs, and this blog post, I replaced the call from update() to merge(), and it solved the problem. I believe ...

2. Difference between Hibernate update by Session.update and HibernateTemplate.merge    stackoverflow.com

I saw to types of update operation: First:

    getHibernateTemplate().execute(new HibernateCallback() {
        public Object doInHibernate(Session session) {  
     ...

3. session.merge() does not get flushed to DB    forum.hibernate.org

public static List getPendingCalls() { Session session = HibernateUtil.getSessionFactory().getCurrentSession(); session.beginTransaction(); List calls = session.createQuery(SELECT_PENDING_ASYNC_CALLS).list(); for (Call call : calls) { call.setBeingProcessed(true); session.merge(call); ...

4. what is session merge() ?    forum.hibernate.org

I need help to understand session merge() in hibernate. After hours of search in net and books , I am frustrated to understand this . I have gathered some information though. merge is used for detached objects .i.e objects which are not attached to DB and disconnected hibernate session. Now , if we modify the POJO (modifying fields using setter methods) ...

5. Re: Problem with session.merge(Object)    forum.hibernate.org

6. Questions to the Session.merge() function    forum.hibernate.org

Hibernate version: 2.1 We are currently designing a web-based application which shall use Hibernate for ORM In our App we create Instances of Objects (let's say a Student named Patrik with several attributes) and pass the Instance to a DTO-Factory which creates a XML-File representing the Student. (Session closed, Instance is detached or even destroyed). The XML-File is sent to a ...

7. Help me use session.merge() properly.    forum.hibernate.org

I'm using Hibernate 3. I have to retrieve a persistence instance and update it. When i try retrieving the same record and update it again, it throws an exception "NonUniqueObject" Then I tried using a session.merge(). it updates the record, but I have a problem retrieving the same record again. it retreives the previous value before the update. however if i ...

8. Wierd pb with session merge    forum.hibernate.org

Hi I have a wierd pb with session merge In the code i have hibSession.merge(moduleData); When the object is persited, the value is inserted and updated in the database with out any issues. But moduleData has a attribute called commetVO . if this is a inserted in the database, the id in the commetVO is not set (updated) but the database ...

9. Prob with sessions merge method    forum.hibernate.org

10. session.merge() generates unnecessary updates.    forum.hibernate.org

Author Message dtrott Post subject: session.merge() generates unnecessary updates. Posted: Thu Jan 26, 2006 9:46 am Newbie Joined: Wed Oct 05, 2005 3:36 am Posts: 15 Hibernate version: 3.1.1 Mapping documents: See Below Code between sessionFactory.openSession() and session.close(): session.merge(a); Name and version of the database you are using: Postgres 8.0.3 The generated SQL (show_sql=true): See Below I am attempting ...

11. Session.merge() immutable class    forum.hibernate.org

12. Problem with session.merge()    forum.hibernate.org

13. TransientObjectException on Session.merge()    forum.hibernate.org

@Entity public class MyEntity { private int id; private MyEntity parent; @Id @GeneratedValue(strategy = GenerationType.IDENTITY) public int getId() { return id; } @ManyToOne ...

14. Merging Back to Transfer Object when using Session.merge    forum.hibernate.org

when using session.merge i would like to get the properties changed by the database merged back to the original input object of the merge method. for example the generated id, the optlocking version or the changed-by information of my interceptor. (the original input object should be used as the result for the GUI) I failed to do this with any interceptor ...