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Rhythmk 学习 Hibernate 09 - Hibernate HQL

2024-07-04 02:38:37   228人阅读

1、初始数据

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@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

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@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

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@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

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@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

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@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、

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@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、

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@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

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@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();
        }
    }
 
}

　　http://pan.baidu.com/s/1hqGDNq0

 


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