Rhythmk 学习 Hibernate 09

1、初始数据

@Testpublic 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

@Testpublic 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

@Testpublic 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

   @Testpublic 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

@Testpublic 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、

@Testpublic 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、

@Testpublic 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

@Testpublic 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

转载于:https://www.cnblogs.com/rhythmK/p/3722043.html

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