In practice this is likelymuch more complicated. Where are the boundaries? If you have a Person which has a relation to a Company, then I assume you do not want to also clone the whole Company, right? ;) But of course, the n Address rows probably should get cloned?
Do you see what I mean? This is imo all depending on your exact intention and the tables in question. LieGrue, strub > Am 27.07.2018 um 16:08 schrieb Matthew Broadhead > <matthew.broadh...@nbmlaw.co.uk.INVALID>: > > i have a complicated object with a large number of children, each child > possibly having their own large number of children. what would be great in > OpenJPA is if you could, say, detach an object and run a command which would > null all @Id and @Version fields in the detached Object and all its > descendants. i suppose it has to be done manually though... > > On 27/07/18 15:52, Albert Lee wrote: >> If the java object implements Serializable or Clonable, you can >> writeObject/readObject to clone to a new entity. The new object will be >> detached and you can reset the id and version as you wish. >> >> >> On Fri, Jul 27, 2018 at 8:39 AM, Matthew Broadhead < >> matthew.broadh...@nbmlaw.co.uk.invalid> wrote: >> >>> i don't think it would clear the id and version fields? do you mean using >>> SerializationUtils clone? >>> https://commons.apache.org/proper/commons-lang/apidocs/org/ >>> apache/commons/lang3/SerializationUtils.html >>> >>> >>> On 27/07/18 15:09, Albert Lee wrote: >>> >>>> If the entity is serializable have you try writing it out and read it back >>>> to a new object? >>>> >>>> On Fri, Jul 27, 2018, 6:05 AM Matthew Broadhead >>>> <matthew.broadh...@nbmlaw.co.uk.invalid> wrote: >>>> >>>> is there a way to deep clone a JPA object automatically? i.e. to copy >>>>> all the parameters and children but clear the id and version fields? >>>>> >>>>> i saw that it is possible to do em.detach(object); and then reset the id >>>>> and version but by the time i have done that i may as well have written >>>>> a full copy function. >>>>> >>>>> >> >
