clone « Data Type « JPA Q&A

1. Is there a best way to clone a model for changing just one entry?    stackoverflow.com

I have a model with some fields, and I'd like to add a new entry in the database of this model, but with changing only one field. Is there a best way to ...

2. cloning a existing object with a new primary key    stackoverflow.com

I have 2 objects as follows

class A{
 Set<B>  bs ;

}

class B{
 A a;

}

3. How do you deep clone a persistent entity in ColdFusion ORM?    stackoverflow.com

I have a persistent entity that I'm using as a template:

Company
    Locations
        Departments
         ...

4. jpa and object duplication/cloning    java.net

Hello. I have a request where i need to read a JPA object tree from a persistence context (a database on a machine) and persist it to an other (database on an other machine). Objets i read from first machine have their IDs and when persisting to second machine, they overwrite objects with same IDs. How can i persist a complete ...

5. Cloning issue    forum.hibernate.org

Hi When i try to save a detached object, i face issue where mappings get lost but if i make a new object from that object and save, then everything works fine. Details: I load the object from the DB and now session is closed, i have the detached object and i wanna save a copy of the detached object, so ...

6. How to clone with many-to-one and many-to-many    forum.hibernate.org

Hi! I have a problem while coding a DAO for a class with some many-to-one and many-to-many relations. Whenever I clone an object of that particular class and pass the cloned instance to the DAO for saveOrUpdate it throws and org.hibernate.NonUniqueObjectException. I am using AnnotationSessionFactoryBean and getCurrentSession() inside the DAO. The clone()-Method: Code: @Override public ...

7. org.hibernate.TransientObjectException while saving clone    forum.hibernate.org

Hi All, Code:

8. Clone of persistent objects    forum.hibernate.org

Hello, I have an application that uses disconnected sessions (using the saveOrUpdate option). A while ago I implemented a 'clone'-option for business entities which worked by simply finding an existing entity and setting the id to null. The next saveOrUpdate would re-create the entity and duplicate all components ex. Before clone: Entity A linked to Foreign Entity X (using a map/list/...) ...

9. Navigating/Updating a Clone    forum.hibernate.org

okay i think i see what you are saying now. the id and version must be ordinary attributes of the object that i can just copy manually, right? the trickiness must be all about lazy proxies and navigation... so what happens if i have Library object that has a lazy collection of books that is being navigated (maybe there are only ...

10. Deep cloning an object containing a Collection    forum.hibernate.org

I've searched the forum for topics concerning cloning a persisted object containing a collection with the intent of persisting the new object. I've seen replies from the Hibernate team about using the Metadata API for this, but I've yet to see a good example. With the number of folks trying to do this, it would seem that someone has come up ...

11. Simple cloning with a simple collection.    forum.hibernate.org

Author Message Jack Bishop Post subject: Simple cloning with a simple collection. Posted: Mon Feb 28, 2005 11:41 am Newbie Joined: Mon Feb 28, 2005 11:07 am Posts: 1 I am using Hibernate 2.0 with Eclipse 3.1 RC5 and MySQL 4.1 and I'm trying to do a simple thing: take a persistent object that has a collection (a Barrell ...

12. Implementing deepCopy of custom UserType with cloning..    forum.hibernate.org

Hibernate version: 3.0 beta4 I am working with custom UserType, and wanted to find out if the deepCopy method can be implemented using cloning ? Also I am working on a set of keys that will be hierarchical in nature. So I was planning to use ParameterizedType with the className of the type as a parameter. So far my tests show ...

13. clone or copy persistent collection    forum.hibernate.org

Searching in the forum, I found an example of cloning an object through serialization. I tried that approch, but I get an HibernateException: You may not change the reference to a collection with cascade="all-delete-orphan" . why does this happen? The thing is that I'm cloning them to get an exact replic of the Bag object, to be able to detect any ...

14. how can i clone (duplicate) an oject?    forum.hibernate.org

AssertionFailure - an assertion failure occured (this may indicate a bug in Hibernate, but is more likely due to unsafe use of the session) org.hibernate.AssertionFailure: null identifier at org.hibernate.engine.EntityKey.(EntityKey.java:33) at org.hibernate.engine.PersistenceContext.reassociateProxy(PersistenceContext.java:489) at org.hibernate.engine.PersistenceContext.unproxyAndReassociate(PersistenceContext.java:528) at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:65) at org.hibernate.impl.SessionImpl.save(SessionImpl.java:429) at org.hibernate.impl.SessionImpl.save(SessionImpl.java:424)

15. What is Clone..in hibernate?    forum.hibernate.org

16. Clone vs Detach (and impact on Session.merge)    forum.hibernate.org

Need help with Hibernate? Read this first: http://www.hibernate.org/ForumMailingli ... AskForHelp Hibernate version: 3.0.5 My first post....couldn't get closure on this by searching the forums or flipping through my trusty Hibernate In Action. Here's our scenario that we can not seem to figure out. When we retrieve an object (call it P1), we use an interceptor to clone it (standard implementation of ...

17. Cloning and Reattaching Objects    forum.hibernate.org

Hi !!! I have the next question: i'm using object clones (serializing and deserializing them) to edit them and then if the page is accepted save them, if not i keep the original. This is bringing me some problems with lazy initialization. When i clone the first object, i get not initialized collections cloned too, so i have to lock object ...

18. Clone data in the same database    forum.hibernate.org

Hi, I know the existence of the "replicate" utility, but this is intended for a different database. So, how do you "clone" some data in the same database? For example, imagine you have the typical application for accounting, where all the tables are filtered by the company you are using in each moment. And you want to copy a complete company ...

19. NullPointer in GregorianCalendar.clone() when persisting    forum.hibernate.org

I'm getting the following exception when trying to persist a newly created entity using EJB3 RC5 in JBoss 4.0.3SP1 with jdk 1.5.0_06 running on Linux. After looking quickly at the code I don't see how GregorianCaleander can get in such a state, and I'm not proficient enough in Hibernate inner workings to understand what's the acctual cause. Caused by: java.lang.NullPointerException at ...

20. clone and compare    forum.hibernate.org

I haven't seen anything so far as best cloning practices go and any specifics with hibernate. Just be careful with Sessions and primary keys as cloning objects is an easy way to get StaleStateExceptions and the likes :) Best way for comparing 2 objects is implementing a good .equals method that exactly mimcs what you want.

21. Deep Clone Object: Curious behavior! Code mistake or Bug?    forum.hibernate.org

Author Message Stef-ne Post subject: Deep Clone Object: Curious behavior! Code mistake or Bug? Posted: Wed Jun 14, 2006 2:11 pm Newbie Joined: Tue Jun 06, 2006 7:33 pm Posts: 11 Hi, I need to use deep clone object...but some Hibernate operation having an strange behavior: the saveOrUpdate method. I load an object from the database, and I clone ...

22. Problem with cloning objects    forum.hibernate.org

Hi, I cant image how to clone object that is persisted to database. My goal is to read object from database and the create identical object with different ID. So if I have object Person with ID 1 in database I would like to create same Person object to database with ID 2 Simple "one level" object cloning works fine, but ...

23. Cloning/ copying advice    forum.hibernate.org

Thanks for the quick reply. I had tried to change the Ids but hibernate threw and Exception because i was trying to change teh ID of an object still associated with a session. It's given me an idea though, I'll try doing a deep copy then changing the IDs as you suggested. One thing I don't know how to do though ...

24. merging status of an entity with a clone    forum.hibernate.org

Hi, I have a hiyerarchical entity tree and at some steps, this structure is cloned, but at some points the user may want to return to some previous state that was cloned before. The problem is that, non of the collections cascade MERGE (and must not) but I found no other way other than updating the top entity and cascading all ...

25. Hibernate, Cloning, and a Relationship    forum.hibernate.org

I have a Java object (Object A) with an Owning Many-Many HashSet relationship to (Object B). I am using a join table with both integer ids to keep track of the relationship. Everything works perfect when I add/update the objects. It is important to note that the Ids of the objects are not assigned by the database and are initialized at ...