Rhythmk 学习 Hibernate 09 - Hibernate HQL

1、初始数据

@Test

	public void test01() {

		Session session = null;



		try {

			session = HibernateUtil.getSessionFactory().openSession();



			session.beginTransaction();



			for (int i = 0; i < 100; i++) {

				book entity = new book();

				entity.setBookCode("book-code-" + i);

				entity.setBookname("book-name" + i);

				entity.setPrice(i);

				session.save(entity);

			}

			session.getTransaction().commit();

		} catch (HibernateException e) {



			e.printStackTrace();

		} finally {

			if (session != null)

				session.close();

		}

	}

　　

2、查询对象

@Test

	public void test02() {

		Session session = null;

		// form 对象名 非 表名

		String sql = " from book ";

		try {

			session = HibernateUtil.getSessionFactory().openSession();



			Query query = session.createQuery(sql);

			List<book> list = (List<book>) query.list();



			for (book b : list) {

				System.out.println(b);

			}



		} catch (HibernateException e) {



			e.printStackTrace();

		} finally {

			if (session != null)

				session.close();

		}

	}

　　

3、查询单字段

@Test

	public void test03() {

		/*

		 * 查询单字段

		 */

		Session session = null;



		String sql = "  select bookname from book ";

		try {

			session = HibernateUtil.getSessionFactory().openSession();



			Query query = session.createQuery(sql);

			List<String> list = (List<String>) query.list();



			for (String b : list) {

				System.out.println(b);

			}



		} catch (HibernateException e) {



			e.printStackTrace();

		} finally {

			if (session != null)

				session.close();

		}

	}

　　

4、查询指定字段

	@Test

	public void test04() {

		/*

		 * 查询多字段,且指定条数Object[]

		 */

		Session session = null;



		String sql = "  select   bookname,bookCode from book ";

		try {

			session = HibernateUtil.getSessionFactory().openSession();



			Query query = session.createQuery(sql);

			// 指定5条

			query.setMaxResults(5);

			List<Object[]> list = (List<Object[]>) query.list();



			for (Object[] b : list) {

				System.out.println(b[0] + "," + b[1]);



			}



		} catch (HibernateException e) {



			e.printStackTrace();

		} finally {

			if (session != null)

				session.close();

		}

	}

　　

5、返回Map对象

@Test

	public void test05() {

		/*

		 * 查询多字段,且指定Map

		 */

		Session session = null;



		String sql = "  select   new Map(bookname,bookCode) from book ";

		try {

			session = HibernateUtil.getSessionFactory().openSession();



			Query query = session.createQuery(sql);



			query.setMaxResults(5);

			List<Map> list = (List<Map>) query.list();



			for (Map b : list) {



				System.out.println((String) b.get("0") + ","

						+ (String) b.get("1"));

			}



		} catch (HibernateException e) {



			e.printStackTrace();

		} finally {

			if (session != null)

				session.close();

		}

	}

　　

6、序列化参数

   6.1、

@Test

	public void test06() {



		Session session = null;



		String sql = "  select   bookname,bookCode from book   where book_id>:book_id and price>:price";

		try {

			session = HibernateUtil.getSessionFactory().openSession();



			Query query = session.createQuery(sql);

			query.setInteger("book_id", 5);

			query.setDouble("price", 5);

			// Hibernate: select book0_.bookname as col_0_0_, book0_.bookCode as

			// col_1_0_ from t_book book0_ where book0_.book_id>? and

			// book0_.price>?

			List<Object[]> list = (List<Object[]>) query.list();



			for (Object[] b : list) {

				System.out.println(b[0] + "," + b[1]);

			}



		} catch (HibernateException e) {



			e.printStackTrace();

		} finally {

			if (session != null)

				session.close();

		}

	}

　　

   6.2、

@Test

	public void test07() {



		Session session = null;



		String sql = "  select   bookname,bookCode from book   where book_id>:book_id and price>:price";

		try {

			session = HibernateUtil.getSessionFactory().openSession();



			Query query = session.createQuery(sql);

			query.setInteger(0, 5);

			query.setDouble(1, 5);

			// Hibernate: select book0_.bookname as col_0_0_, book0_.bookCode as

			// col_1_0_ from t_book book0_ where book0_.book_id>? and

			// book0_.price>?

			List<Object[]> list = (List<Object[]>) query.list();



			for (Object[] b : list) {

				System.out.println(b[0] + "," + b[1]);

			}



		} catch (HibernateException e) {



			e.printStackTrace();

		} finally {

			if (session != null)

				session.close();

		}

	}

　　

7、执行SQL

@Test

	public void test08_jdbc() {

		Session session = null;

//Rhythmk 

		String sql = "  select bookCode,bookname from t_book  where  book_id>? and price>?";

		try {

			session = HibernateUtil.getSessionFactory().openSession();



			SQLQuery query = session.createSQLQuery(sql);

			query.setInteger(0, 5);

			query.setDouble(1, 5);



			List<Object[]> list = (List<Object[]>) query.list();

			for (Object[] b : list) {

				System.out.println(b[0] + "," + b[1]);

			}



		} catch (HibernateException e) {



			e.printStackTrace();

		} finally {

			if (session != null)

				session.close();

		}

	}



}

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