1.网上最常见的JPA----entityManager批量操作方法

private EntityManager em;    @PersistenceContext(name = "EntityManagerFactory")    public void SetEntityManager(EntityManager em) {        this.em = em;    }    @Transactional    public void saveBatch(List
     
       list) {        for (int i = 0; i < 10000; i++) {            em.persist(list.get(i));            if (i % 1000 == 0) {                em.flush();                em.clear();            }        }    }
     

2.Jpa--Repository批量写入

@Transactional    public void saveBatchJpa(List
     
       list) {        repository.save(list);    }
     

 

3.结论

EM和JPA直接操作集合没有太大的性能区别，直接使用JPA操作集合即可。如下是JPA操作集合的代码，可以看出起始内部也是用的em

　　@Transactional    public  List save(Iterable entities) {        List result = new ArrayList();        if (entities == null) {            return result;        }        for (S entity : entities) {            result.add(save(entity));        }        return result;    }/*     * (non-Javadoc)     * @see org.springframework.data.repository.CrudRepository#save(java.lang.Object)     */    @Transactional    public  S save(S entity) { if (entityInformation.isNew(entity)) { em.persist(entity); return entity; } else { return em.merge(entity); } }