Hibernate HelloWorld

浏览数：40 / 时间：2015年06月09日

Hibernate版本_hibernate-release-4.3.8.Final

下载地址http://hibernate.org/

1.新建JavaWeb项目

2.添加所需要的jar包

  将hibernate-release-4.3.8.Final\lib\required下的所有文件添加到build path中即可

  文件列表如下:

antlr-2.7.7.jar
dom4j-1.6.1.jar
hibernate-commons-annotations-4.0.5.Final.jar
hibernate-core-4.3.8.Final.jar
hibernate-jpa-2.1-api-1.0.0.Final.jar
jandex-1.1.0.Final.jar
javassist-3.18.1-GA.jar
jboss-logging-3.1.3.GA.jar
jboss-logging-annotations-1.2.0.Beta1.jar
jboss-transaction-api_1.2_spec-1.0.0.Final.jar

3.编写配置文件hibernate.cfg.xml

  在src目录下新建文件hibernate.cfg.xml

<?xml version=‘1.0‘ encoding=‘utf-8‘?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

    <session-factory>

        <!-- Database connection settings -->
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost/hibernate</property>
        <property name="connection.username">root</property>
        <property name="connection.password">mysql</property>

        <!-- JDBC connection pool (use the built-in) -->
        <property name="connection.pool_size">1</property>

        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

        <!-- Enable Hibernate‘s automatic session context management -->
        <property name="current_session_context_class">thread</property>

        <!-- Disable the second-level cache  -->
        <property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>

        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>

        <!-- Drop and re-create the database schema on startup-->
        <property name="hbm2ddl.auto">update</property> 
        
        <property name="javax.persistence.validation.mode">none</property> 
        
        <mapping class="com.ssh.vo.User"/>
    </session-factory>

</hibernate-configuration>

4.创建实体类

技术分享 
 1 /**----------------------------------------------------------+
 2  +   PGM-ID  :   User.java
 3  +   Author  :   H.Liu
 4  +   Date    :   2015年3月21日 下午5:47:04
 5  +   Function:   通过注解进行映射   
 6  +               
 7  +-----------------------------------------------------------*/
 8 package com.ssh.vo;
 9 
10 import java.io.Serializable;
11 
12 import javax.persistence.Column;
13 import javax.persistence.Entity;
14 import javax.persistence.GeneratedValue;
15 import javax.persistence.Id;
16 import javax.persistence.Table;
17 
18 @Entity
19 @Table(name="user")
20 public class User implements Serializable {
21     
22     //@GeneratedValue主键生成策略由hibernate自己决定
23     @Id@GeneratedValue
24     private int id;
25     private String password;
26     @Column(name="username")
27     private String username;
28 
29     public User(){
30         
31     }    
32     
33     public User(String username,String password) {
34         this.username = username;
35         this.password = password;
36     }
37 
38     public User(int id, String password, String username) {
39         super();
40         this.id = id;
41         this.password = password;
42         this.username = username;
43     }
44 
45     public int getId() {
46         return id;
47     }
48 
49     public String getPassword() {
50         return password;
51     }
52 
53     public String getUsername() {
54         return username;
55     }
56 
57     public void setId(int id) {
58         this.id = id;
59     }
60 
61     public void setPassword(String password) {
62         this.password = password;
63     }
64     
65     public void setUsername(String username) {
66         this.username = username;
67     }
68     
69 }
View Code

 

5.编写数据操作类

/**----------------------------------------------------------+
 +   PGM-ID  :   UserDaoImpl.java
 +   Author  :   H.Liu
 +   Date    :   2015年3月22日 上午11:50:26
 +   Function:   
 +               
 +-----------------------------------------------------------*/
package com.ssh.dao;

import java.io.Serializable;
import java.util.Iterator;
import java.util.List;

import org.hibernate.HibernateException;
import org.hibernate.SQLQuery;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;

import com.ssh.util.HibernateUtil;
import com.ssh.vo.User;

public class UserDaoImpl {
    
    // 向数据库的添加记录
    public int add(User user){
        
        SessionFactory sessionFactory = HibernateUtil.getSessionFactory();//获得工厂类
        
        Session session = sessionFactory.openSession();//取得session
        
        Transaction  tx = null;//定义事务
        try{
            tx = session.beginTransaction();
            Serializable i = session.save(user);
            System.out.println(i);
            tx.commit();//提交
        } catch (HibernateException e){
            if(tx!=null) tx.rollback();
            e.printStackTrace();
        } finally{
            session.close();
        }
        
        return 0;
    }
    
    // 获得表中所有记录
    public void list(){
        SessionFactory sessionFactory = HibernateUtil.getSessionFactory();//获得工厂类
        
        Session session = sessionFactory.openSession();//取得session
        
        Transaction  tx = null;//定义事务
        try{
            tx = session.beginTransaction();
            
            //通过HQL进行查询
            /**
            List<?> users = session.createQuery("select new User(u.id, u.username, u.password) from com.ssh.vo.User u").list();
            */
            SQLQuery query = session.createSQLQuery("select id,username,password from user");
            query.addEntity(User.class);
            List<?> users = query.list();
            User user = null;
            Iterator<?> iterator =users.iterator();
            while(iterator.hasNext()){
                user= (User) iterator.next();
                System.out.println("| " +user.getId() + "|" + user.getUsername() +"|" + user.getPassword() + " |");
            }
            tx.commit();//提交
        } catch (HibernateException e){
            if(tx!=null) tx.rollback();
            e.printStackTrace();
        } finally{
            session.close();
            sessionFactory.close();
        }
            
    }
    
    //更新表中的数据
    public void update(User user){
        SessionFactory sessionFactory = HibernateUtil.getSessionFactory();//获得工厂类
        
        Session session = sessionFactory.openSession();//取得session
        
        Transaction  tx = null;//定义事务
        try{
            tx = session.beginTransaction();
            session.update(user);

            tx.commit();//提交
        } catch (HibernateException e){
            if(tx!=null) tx.rollback();
            e.printStackTrace();
        } finally{
            session.close();
            sessionFactory.close();
        }      
    }
    
    //删除表中的数据
    public void delete(User user){
        SessionFactory sessionFactory = HibernateUtil.getSessionFactory();//获得工厂类
        
        Session session = sessionFactory.openSession();//取得session
        
        Transaction  tx = null;//定义事务
        try{
            tx = session.beginTransaction();
            session.delete(user);

            tx.commit();//提交
        } catch (HibernateException e){
            if(tx!=null) tx.rollback();
            e.printStackTrace();
        } finally{
            session.close();
            sessionFactory.close();
        }      
    }
}
/**----------------------------------------------------------+
 +   PGM-ID  :   HibernateUtil.java
 +   Author  :   H.Liu
 +   Date    :   2015年3月21日 下午5:54:53
 +   Function:   取得SessionFactory
 +               
 +-----------------------------------------------------------*/
package com.ssh.util;

import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistry;
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 {  
            Configuration cfg = new Configuration().configure();  
            StandardServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()  
                                .applySettings(cfg.getProperties()).build();  
            SessionFactory sessionFactory = cfg.buildSessionFactory(serviceRegistry);  
            return sessionFactory;  
              
        }  
        catch (Throwable ex) {  
            System.err.println("Initial SessionFactory creation failed." + ex);  
            throw new ExceptionInInitializerError(ex);  
        }  
    }  
  
    public static SessionFactory getSessionFactory() {  
        return sessionFactory;  
    }

}

 

6.编写测试类

/**----------------------------------------------------------+
 +   PGM-ID  :   UserManager.java
 +   Author  :   H.Liu
 +   Date    :   2015年3月21日 下午5:53:15
 +   Function:   
 +               
 +-----------------------------------------------------------*/
package com.ssh.dao;

import com.ssh.vo.User;

public class UserManager {

    public static void main(String[] args) {

        UserDaoImpl userDaoImpl = new UserDaoImpl();
        User user = new User("sa", "sa");
        userDaoImpl.add(user);
        userDaoImpl.list();
        userDaoImpl.update(new User(1, "ss", "ss"));
        userDaoImpl.delete(new User(1, "ss", "ss"));
    }

}

 

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