问从JPA元素集合中删除元素

EN

Branch toBoRemoved = ...; // find out which element needs to be removed
for (Iterator i = entity.getBranches().iterator(); i.hasNext();) {
    Branch b = (Branch)i.next();
    if (b.equals(toBeRemoved)) {  // you'll need to implement this
        i.remove();
    }
}
entityManager.merge(entity);