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How to remove child objects from a @ManyToMany relation with lots of children in JPA and Hibernate


How to remove child objects from a @ManyToMany relation with lots of children in JPA and Hibernate

By : Prakash
Date : November 18 2020, 03:01 PM
Any of those help As I explained in this article, if you have more than 50 or 100 child entities, you shouldn't map a collection.
Therefore, @OneToMany is misleading because, in reality, @OneToFew makes more sense. So, when many means 1000 or 10000, mapping such a collection becomes a real performance problem.
code :
delete from UserOrganization uo
where uo.organization = :organization


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Hibernate remove relation manyToMany

Hibernate remove relation manyToMany


By : Rkess26
Date : March 29 2020, 07:55 AM
it helps some times Finally got this working, mostly by sheer luck, this is what I ended up with in my RoleDaoImpl class.
code :
@Override
    @Transactional
    public boolean revokeRolesFromUserAccount(User user, List<Role> userRoles) {        
        if (user == null) {
            return false;
        }
        if (userRoles == null) {
            return false;
        }   

        User newUser = null;
        newUser = (User) this.sessionFactory.getCurrentSession().load(User.class, user.getUid());   

        List<Role> newRoleList = newUser.getRoles();

        newRoleList.removeAll(userRoles);

        if(newUser.getRoles().retainAll(newRoleList)){
            if (log.isInfoEnabled()) {
                log.info("Roles revoked from the User " + user.getUsername());
            }
            this.sessionFactory.getCurrentSession().saveOrUpdate(newUser);          
            return true;
        }else{
            return false;
    }
Hibernate required manytomany relation

Hibernate required manytomany relation


By : Enes Tural
Date : March 29 2020, 07:55 AM
hop of those help? What version of Java EE are you using?
If it's EE 6: add a @NotNull on the labels
Hibernate @ManyToMany delete relation

Hibernate @ManyToMany delete relation


By : user3795764
Date : March 29 2020, 07:55 AM
should help you out What you need is the @JoinTable attribute:
Hibernate does not know that the many-to-many relations refer to each other and will probably create two join tables. If you specify the same @JoinTable on both sides of the relation it will work as expected.
JPA/Hibernate: ManyToMany delete relation

JPA/Hibernate: ManyToMany delete relation


By : Anatole Menon-Johans
Date : March 29 2020, 07:55 AM
should help you out Cascade will not clean up the leftover references to the deleted Person that remain on the Group object in memory. You have to do that manually. It seems like cascade should do this, but sadly that's not the way it works.
Based on the info provided in your question, I don't think you need any cascade options set on your Person or Group entities. It doesn't sound like they share a parent/child relationship where the existence of one depends upon the other. That's the kind of relationship where I would expect to see some cascade options.
Grails and Hibernate - Lots of domain objects with lots of properties

Grails and Hibernate - Lots of domain objects with lots of properties


By : user4269916
Date : March 29 2020, 07:55 AM
I wish this helpful for you How are you getting your pre/post memory numbers? It doesn't feel likely to me that your entire set of domain objects is getting loaded into memory unless you've got a very weird plugin or something extra in your BootStrap.groovy file.
Probably the easiest way to see if this is really happening is to just turn on trace level logging for hibernate:
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