Hibernate框架之常见查询操作

1、oid方式--- get / load方法（get / load方法一样）

public class HibernateTest {

    @Test
    public void test(){
        Session session = HibernateUtils.openSession();
        Transaction transaction = session.beginTransaction();

		Customer customer = session.get(Customer.class, 1L);
		Customer customer2 = session.get(Customer.class, 4L);
		
		System.out.println(customer);
		System.out.println(customer2);

        transaction.commit();
        HibernateUtils.close(session);
    }
}

    2、对象导航方式（一对多为例）

public class OneToManyTest {
	
	
	@Test
	//测试对象导航查询
	public void test1(){
		
		Session session = HibernateUtils.openSession();
		Transaction transaction = session.beginTransaction();
		
		Linkman linkman = session.get(Linkman.class, 1L);
		System.out.println(linkman.getLkm_name());
		Customer customer = linkman.getCustomer();
		System.out.println(customer.getCust_name());
		
		transaction.commit();
		session.close();
	}
	
	
	@Test
	//测试对象导航查询
	public void test2(){
		
		Session session = HibernateUtils.openSession();
		Transaction transaction = session.beginTransaction();
		
		Customer customer = session.get(Customer.class, 1L);
		System.out.println(customer.getCust_name());
		//查询与该customer相关的linkman
		Set linkmans = customer.getLinkmans();
		for(Linkman man : linkmans){
			System.out.println(man.getLkm_name());
		}
		
		transaction.commit();
		session.close();
	}
}

    3、HQL方式（Hibernate Query Language）---面向对象+结构化查询（重点）

public class HQLHibernate {

    //排序查询
    @Test
    public void test07(){
        Session session = HibernateUtils.openSession();
        Transaction transaction = session.beginTransaction();

        //Query代表面向对象的hibernate操作,createQuery创建查询对象
        Query query = session.createQuery("FROM Customer ORDER BY cust_name DESC");
        List