Hibernate使用Annotations最简单例子：

 

hibernate.cfg.xml

     
         
              
               
       
        com.mysql.jdbc.Driver
               
       
        jdbc:mysql://127.0.0.1/testdb
               
       
        root
               
               
               
       
        1
               
               
       
        org.hibernate.dialect.MySQL5Dialect
               
               
       
        thread
               
               
       
        org.hibernate.cache.internal.NoCacheProvider
               
               
       
        true
               
               
       
        update
               
           
      
     

 

HibernateUtil.java

package com.my.dao.util;import org.hibernate.SessionFactory;import org.hibernate.boot.registry.StandardServiceRegistryBuilder;import org.hibernate.cfg.Configuration;public class HibernateUtil {    private static final SessionFactory sessionFactory = buildSessionFactory();    private static SessionFactory buildSessionFactory() {        try {            // Create the SessionFactory from hibernate.cfg.xml            Configuration configuration = new Configuration();            return configuration.configure().buildSessionFactory(                    new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build());        } catch (Throwable ex) {            // Make sure you log the exception, as it might be swallowed            System.err.println("Initial SessionFactory creation failed." + ex);            throw new ExceptionInInitializerError(ex);        }    }    public static SessionFactory getSessionFactory() {        return sessionFactory;    }    }

 

POJO

package com.my.bean;import java.util.Date;import javax.persistence.*;@Entity@Table(name="user")public class User {    @Id @GeneratedValue @Column(name="user_id", nullable=false)    private long userID;        @Column(name="user_name", length=100, nullable=false)    private String userName;        @Column(name="create_time", nullable=false)    private Date createTime;    public long getUserID() {        return userID;    }    public void setUserID(long userID) {        this.userID = userID;    }    public String getUserName() {        return userName;    }    public void setUserName(String userName) {        this.userName = userName;    }    public Date getCreateTime() {        return createTime;    }    public void setCreateTime(Date createTime) {        this.createTime = createTime;    }}

 

Test:

package com.my.init;import java.util.Date;import org.hibernate.Session;import org.hibernate.Transaction;import com.my.bean.User;import com.my.dao.util.HibernateUtil;public class Test {    public static void main(String[] args) {        Session session = HibernateUtil.getSessionFactory().openSession();        Transaction tx = session.beginTransaction();                try {            User user = new User();            user.setUserName("Robin");            user.setCreateTime(new Date());                        session.save(user);                        tx.commit();        } catch (Exception e) {            tx.rollback();            e.printStackTrace();        }                session.close();    }}

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