Question

i have two tables:

Authority, Permission they have many to many relationship

class Authority{

@ManyToMany(cascade = CascadeType.ALL)
    @JoinTable(name = "authority_permission", joinColumns = { @JoinColumn(name = "authority_id", nullable = false, updatable = false) }, inverseJoinColumns = { @JoinColumn(name = "permission_id", nullable = false, updatable = false) })
    private List<Permission> permissions = new ArrayList<Permission>(0);

}

some times i need to create a new Authority and assign to it some existing permissions (insert data in authority , authority_permission only) as follows:

List<Permission> permissions=new ArrayList<Permission>;
Permission permission=permissionDao.getPermissionById(1); 
permissions.add(permission);   
authority.setPermissions(permissions)
sessionFactory.getCurrentSession().save(authority).

above code, works fine, but i noticed that hibernate makes an extra update in permission table, which is not needed, since there are no changes in permission table:

Hibernate: insert into authority (description, display_name, is_default, name, authority_id) values (?, ?, ?, ?, ?)
Hibernate: update permission set description=?, display_name=?, name=? where permission_id=?
Hibernate: insert into role_permission (role_id, permission_id) values (?, ?)

any ideas how to avoid this extra update ?

Answer 1

Change the cascade type annotation