1、 对象关系映射。 对象:java程序中类 关系:关系型数据库中的表O;public class Goods implements java.io.Serializable / Fields private Integer goodsId; private String goodsName; private Double goodsPrice; private Integer goodsNum;R:CREATE TABLE goods ( goods_id int(11) NOT NULL auto_increment, goods_name varchar(200) default NULL,
2、 goods_price double default NULL, goods_num int(11) default NULL, PRIMARY KEY (goods_id)M:Goods.hbm.xml文件,ORM文件 id name=goodsId type=java.lang.Integercolumn name=goods_id /generator class=identity/generator/idproperty name=goodsNamejava.lang.Stringgoods_name length=200/propertygoodsPricejava.lang.Do
3、ublegoods_price precision=22 scale=0goodsNumgoods_num/class/hibernate-mapping4 手动实现Hibernate的第一个案例(基于hibernate4.3.5版本)4.1 创建工程并导入hibernate的jar文件4.2 编写实体类和数据库关系表4.3 编写ORM文件?xml version=1.0!DOCTYPE hibernate-mapping PUBLIC -/Hibernate/Hibernate Mapping DTD 3.0/ENhttp:/www.hibernate.org/dtd/hibernate-m
4、apping-3.0.dtd column= session-factory- Database connection settings -connection.driver_classcom.mysql.jdbc.Driverconnection.urljdbc:mysql:/127.0.0.1:3306/no8?useUnicode=true&characterEncoding=utf8connection.usernamerootdialectorg.hibernate.dialect.MySQLDialectshow_sqltruemapping resource=com/no
5、8/domain/Goods.hbm.xml/session-factory/hibernate-configuration4.5 编写工具类加载Hibernate配置文件创建sessionFactory基于hibernate4版本。在hiberante3版本中不要修改Configuration configuration = new Configuration().configure();ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder() .applySettings(configuration.get
6、Properties().build();SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);4.6 从SessionFactory中创建Session对象Session session = HibernateUtil.getSessionFactory().openSession();4.7 通过调用session对象的方法实现数据库的CURD操作public class SaveTest public static void main(String args) Goods go
7、ods = new Goods(); goods.setGoodsName(索爱); goods.setGoodsNum(1); goods.setGoodsPrice(35D); Session session = HibernateUtil.getSessionFactory().openSession(); Transaction tran = session.getTransaction(); tran.begin(); session.save(goods); mit(); session.close(); HibernateUtil.getSessionFactory().close(); System.out.println(end public class FindById Goods goods = (Goods) session.get(Goods.class, 3); System.out.println(goods.getGoodsName(); System.out.println(goods.getGoodsPrice();public class Update goods.setGoodsNum(100); session.update(goods);
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