hibernate demo 搭建

User 接口：

public class User implements java.io.Serializable {private int id;private String name;private String password;private String type;User(){}public int getId(){return this.id;}public void setId(int id){this.id = id;}public void setName(String name){this.name = name;}public String getName(){return this.name;}public void setPassword(String password){this.password =password;}public String getPassword(){return this.password;}public void setType(String type){this.type = type;}public String getType(){return this.type;} }
User.hbm.xml 映射文件

<?xml version="1.0" encoding="UTF-8"> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping> <!-- name 指定持久化类名 table 指定数据表--> <class name="org.hibernate.entity.User" table="USER"> <!--将数据表和bean 映射对应起来--> <id name="id" type="java.lang.Interger" column="USER_ID"> <generator class="increment"> </id><property name="name" type="java.lang.String" column="NAME" length="20"> </property><property name="password" type="java.lang.String" column="NAME" length="12"> </property><property name="type" type="java.lang.String" column="TYPE" length="6"> </property> </class> </hibernate-mapping>
hibernate.cfg.xml  配置文件

<?xml version="1.0" encoding="UTF-8"> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Configration DTD3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory> <!-- 数据库链接设置--> <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> <!--数据库url-><property name="hibernate.connection.url" > jdbc:mysql://localhost:3306/mysqldb </property><property name="hibernate.connection.username" >mysql</property><property name="hibernate.connection.password" >123456</property> <property name="hibernate.connection.pool_size" >1</property> <property name="dialect" >org.hibernate.dialect.MySQLDialect</property> <property name="show_sql" >true</property> <!--列出所有映射文件--> <mapping resource="org/hibernate/entity/User.hbm.xml"/> </session-factory> </hibernate-configuration>

UserADO 接口类：

public interface UserDAO {void save(User user);User findById(int id);void delete(User user);void update(User user); }

H会bernateUtil实现类：

public class HibernateUtil{private static SessionFactory sessionFactory;private static final ThreadLocal<Session> threadLocal= new ThreadLocal<Session>();static {try{Configuration cfg = new Configuration().configure();sessionFactory = cfg.buildSessionFactory();}catch (Throwable ex){throew new ExceptionInInitializerError(ex);}}// 获得sessionfactory实例public static SessionFactory getSessionFactory(){return sessionFactory;}public static Sesstion getSession() throws HibernateExcaption{Session session = (Session) threadLocal.get();if(session == null || !session.isOpen()){if(sessionFactory == null){rebuildSesstionFactory();}session = (sessionFactory != null)? sessionFactory.openSession():null;threadLocal.set(session);}return session;}public staitc void closeSession() throws HibernateExcaption{Session session = (Session) threadLocal.get();threadLocal.setnull();if(session == null ) {sesstion.close();}}public static void rebuildSesstionFactory(){try{confuguration.confugure.(/hibernate.cfg.xml);sessionFactory configuration.buildSessionFactory();}catch(Exception e){System.err.println("error ncreate session factory.");e.printStackTrace();}}public static void shutdown(){getSessionFactory().close();}}

UserADOImpl 实现类：public class UserADOImpl implements UserDAO{public void save(User user){Session session = HibernateUtil.getSession();Transaction tx =session.beginTransaction();try{session.save(user);tx.commit();}catch(Exception e){e.printStackTrace();tx.rollback();}finally {HibernateUtil.closeSession();}}public void delete(User user){Session session = HibernateUtil.getSession();Transaction tx =session.beginTransaction();try{session.delete(user);tx.commit();}catch(Exception e){e.printStackTrace();tx.rollback();}finally {HibernateUtil.closeSession();}}public void update(User user){Session session = HibernateUtil.getSession();Transaction tx =session.beginTransaction();try{session.update(user);tx.commit();}catch(Exception e){e.printStackTrace();tx.rollback();}finally {HibernateUtil.closeSession();}}public User findByyId(int id){User user = null;Session session = HibernateUtil.getSession();Transaction tx =session.beginTransaction();try{user = session.get(User.class, id);tx.commit();}catch(Exception e){e.printStackTrace();tx.rollback();}finally {HibernateUtil.closeSession();}return user;} }

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