（1）建立实体类User.java
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package com.liang.hibernate;
import java.util.Date;
public class User {
private String id;
private String name;
private String password;
private Date createTime;
private Date expireTime;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public Date getCreateTime() {
return createTime;
}
public void setCreateTime(Date createTime) {
this.createTime = createTime;
}
public Date getExpireTime() {
return expireTime;
}
public void setExpireTime(Date expireTime) {
this.expireTime = expireTime;
}
}
（2）提供User.hbm.xml文件，完成实体类映射
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<span style="font-size:12px;"><?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<!--生成默认为user的数据库表-->
<class name="com.liang.hibernate.User">
<id name="id">
<!-- 算法的核心思想是结合机器的网卡、当地时间、一个随机数来生成GUID -->
<generator class="uuid"></generator>
</id>
<property name="name"></property>
<property name="password"></property>
<property name="createTime" type="date"></property>
<property name="expireTime" type="date"></property>
</class>
</hibernate-mapping></span>
（3）将User.hbm.xml文件加入到hibernate.cfg.xml文件中
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<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- 设置数据库驱动 -->
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<!-- 设置数据库URL -->
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate_first</property>
<!-- 数据库用户名 -->
<property name="hibernate.connection.username">root</property>
<!-- 数据库密码 -->
<property name="hibernate.connection.password">123456</property>
<!-- 指定对应数据库的方言，hibernate为了更好适配各种关系数据库，针对每种数据库都指定了一个方言dialect -->
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<!-- 映射文件 -->
<mapping resource="com/liang/hibernate/User.hbm.xml"/>
</session-factory>
</hibernate-configuration>
（4）编写工具类ExportDB.java，将hbm生成ddl,也就是hbm2ddl
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package com.liang.hibernate;
import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;
/**
* 将hbm生成ddl
* @author liang
*
*/
public class ExportDB{
public static void main(String[]args){
//默认读取hibernate.cfg.xml文件
Configuration cfg = new Configuration().configure();
////生成并输出sql到文件（当前目录）和数据库
SchemaExport export = new SchemaExport(cfg);
export.create(true, true);
}
}
测试之前，要提前建立数据库hibernate_first，测试如下：
控制台打印的SQL语句：
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drop table if exists User
create table User (id varchar(255) not null, name varchar(255), password varchar(255), createTime date, expireTime date, primary key (id))
数据库表结构：
（5）建立客户端类Client，添加用户数据到mySQL
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package com.liang.hibernate;
import java.util.Date;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class Client {
public static void main(String[]args){
//读取hibernate.cfg.xml文件
Configuration cfg = new Configuration().configure();
//建立SessionFactory
SessionFactory factory =cfg.buildSessionFactory();
//取得session
Session session = null;
try{
//开启session
session = factory.openSession();
//开启事务
session.beginTransaction();
User user = new User();
user.setName("jiuqiyuliang");
user.setPassword("123456");
user.setCreateTime(new Date());
user.setExpireTime(new Date());
//保存User对象
session.save(user);
//提交事务
session.getTransaction().commit();
}catch(Exception e){
e.printStackTrace();
//回滚事务
session.getTransaction().rollback();
}finally{
if(session != null){
if(session.isOpen()){
//关闭session
session.close();
}
}
}
}
}
右键debug运行，测试完成之后，我们查询一下测试结果：
5、为了在调试过程中能观察到Hibernate的日志输出，最好加入log4j.properties配置文件、在CLASSPATH中新建log4j.properties配置文件或将该配置文件拷贝到src下，便于程序调试。
内容如下：
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<span style="font-size:12px;">### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
### direct messages to file hibernate.log ###
#log4j.appender.file=org.apache.log4j.FileAppender
#log4j.appender.file.File=hibernate.log
#log4j.appender.file.layout=org.apache.log4j.PatternLayout
#log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
### set log levels - for more verbose logging change 'info' to 'debug' ###
log4j.rootLogger=warn, stdout</span>
配置完成后，项目结构如下图所示：
