1 批量删除是调用sql引擎执行sql语句。批量插入有两种方式，a：自己拼接出一条sql语句 b：利用hibernate的session一级缓存，每多少条刷新缓存存入数据库

@Component  public class StudentDao extends HibernateDao<Student, Integer> {        public void deleteByIds(List<?> ids) {          String hql = "delete from Student where id in (:ids)";          createQuery(hql).setParameterList("ids", ids).executeUpdate();      }        public void saveBatch(List<Student> stuList) {          if (null != stuList && stuList.size() > 0) {              Session session = sessionFactory.openSession();              Transaction tx = session.beginTransaction();              try {                  for (int i = 0; i < stuList.size(); i++) {                      session.save(stuList.get(i));                      if (i % 100 == 0) { // 每一百条刷新并写入数据库                          session.flush();                          session.clear();                      }                  }              } catch (HibernateException e) {                  e.printStackTrace();              }finally{                  tx.commit();                  session.close();              }          }      }  }  //批量查询，当然hibernate也提供了使用某一个属性查询出集合      String hql = "from Goods  where  merchandiseId in (:ids)";      List<Goods> goodsList = goodsDao.createQuery(hql).setParameterList("ids", idList).list();

2 批量插入采用sql时如下：

public void setMappingGoods(Integer merchandiseId,List<Integer> ids) {          StringBuilder sb = new StringBuilder();          sb.append("insert into mapping_goods(kid,oid) values ");          for(Integer id:ids){              sb.append("("+merchandiseId+","+id+")"+",");          }          goodsmapDao.getSession().createSQLQuery(sb.substring(0, sb.length()-1)).executeUpdate();      }

3 hql 关联查询:当没有在实体中设置关联关系，而是自己建立的中间表时，可以用hql关联查询数据。

    public List<Goods> getMappingGoods(String kuuid) {          if(StringUtils.empty(kuuid)){              return new ArrayList<Goods>();          }          String hql = " from Goods g where  g.merchandiseUuid!=? and ( (g.merchandiseUuid in (select mp.kuuid from Goodsmap mp where mp.kuuid=? or mp.ouuid=?)) or (g.merchandiseUuid in (select mp.ouuid from Goodsmap mp where mp.kuuid=? or mp.ouuid=?)))";          return goodsDao.find(hql,kuuid, kuuid,kuuid, kuuid,kuuid);      }