Hibernate之Criteria语言查询

基本查询

 @Test
     public void test_01(){
         Session session = HibernateUtils.openSession();
         Transaction transaction = session.beginTransaction();
         Criteria criteria = session.createCriteria(Customer.class);
         List<Customer> list = criteria.list();
         for(Customer cus:list)
         System.out.println(cus);
     }

　　

条件查询

  public void test_02(){
          Session session = HibernateUtils.openSession();
          Transaction transaction = session.beginTransaction();
          Criteria criteria = session.createCriteria(Customer.class);
          criteria.add(Restrictions.eq("cust_id",1l));
          Customer customer = (Customer) criteria.uniqueResult();
          System.out.println(customer);
          transaction.commit();
          session.close();
     }

　　

分页查询

 public void test_03(){
          //分页查询
          Session session = HibernateUtils.openSession();
          Transaction transaction = session.beginTransaction();
          Criteria criteria = session.createCriteria(Customer.class);
          criteria.setFirstResult(0);
          criteria.setMaxResults(3);
          List<Customer> list = criteria.list();
          for(Customer cus : list){
             System.out.println(cus);
         }
         transaction.commit();
         session.close();
     }

　　

使用聚合函数：

  public void test04(){
          //设置查询总的记录数
          Session session = HibernateUtils.openSession();
          Transaction transaction = session.beginTransaction();
          Criteria criteria = session.createCriteria(Customer.class);
          criteria.setProjection(Projections.rowCount());
          Long count = (Long) criteria.uniqueResult();
          System.out.println(count);
          transaction.commit();
         session.close();
         
     }