【hibernate实例】赵雅智_第一例配置及增加

新建java项目hibernate

在hibernate项目下，新建文件夹lib，并添加jar包

新建数据库hibernate

新建表user

新建domain包，封装类

User.java

 package www.hbsi.com.domain;

 import java.sql.Date;

 public class User {
     private int id;
     private String name;
     private Date birthday;
     public int getId() {
         return id;
     }
     public void setId(int id) {
         this.id = id;
     }
     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     public Date getBirthday() {
         return birthday;
     }
     public void setBirthday(Date birthday) {
         this.birthday = birthday;
     }
     @Override
     public String toString() {
         return "User [birthday=" + birthday + ", id=" + id + ", name=" + name
                 + "]";
     }
 }

创建配置文件

Hibernate.cfg.xml

 <!DOCTYPE hibernate-configuration PUBLIC
     "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
     "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

 <!-- 根标签，根元素 -->
 <hibernate-configuration>
     <!-- session工厂 -->
     <session-factory>
         <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
         <property name="connection.url">jdbc:mysql:///hibernate</property>
         <property name="connection.username">root</property>
         <property name="connection.password">123456</property>
         <!-- 方言，连接的哪个数据库 -->
         <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
         <!-- 执行的时候是否输出sql句 -->
         <property name="show_sql">true</property>
         <!-- 数据定义语言 -->
         <property name="hbm2ddl.auto">update</property>
     </session-factory>
 </hibernate-configuration>

持久化类的映射文件

User.hbm.xml

 <?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 package="com.hbsi.domain">
     <!-- 主键 -->
     <class name="User" >
         <id name="id">
             <generator class="increment" />
         </id>
         <!-- 属性 -->
         <property name="name" />
         <property name="birthday" />
     </class>



 </hibernate-mapping>

让hibernate.cfg.xml知道持久化类，修改hibernate.cfg.xml

hibernate.cfg.xml

 <!DOCTYPE hibernate-configuration PUBLIC
     "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
     "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

 <!-- 根标签，根元素 -->
 <hibernate-configuration>
     <!-- session工厂 -->
     <session-factory>
         <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
         <property name="connection.url">jdbc:mysql:///hibernate</property>
         <property name="connection.username">root</property>
         <property name="connection.password">123456</property>
         <!-- 方言，连接的哪个数据库 -->
         <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
         <!-- 执行的时候是否输出sql句 -->
         <property name="show_sql">true</property>
         <!-- 数据定义语言 -->
         <property name="hbm2ddl.auto">update</property>
         <!-- 加载持久化类文件 -->
         <mapping resource="www/hbsi/com/domain/User.hbm.xml"/>

     </session-factory>
 </hibernate-configuration>

做一个测试类

Demo1.java

 package www.hbsi.com.demo;
 import java.util.Date;

 import org.hibernate.Session;
 import org.hibernate.SessionFactory;
 import org.hibernate.cfg.Configuration;

 import www.hbsi.com.domain.User;

 public class Demo1 {
     public static void main(String args[]){
         User user = new User();
         user.setName("Nacy");
         user.setBirthday(new Date());

         //新建一个配置对象，通过此对象加载hibernate.cfg.xml信息
         Configuration cfg = new Configuration().configure();

         //创建session工厂
         SessionFactory sessionFactory = cfg.buildSessionFactory();
         //得到session对象  相当于JDBC的Connection
         Session session = sessionFactory.openSession();

         //hibernate下要开启事务进行保存
         session.beginTransaction();
         //保存
         session.save(user);
         //提交事务
         session.getTransaction().commit();
         //关闭事务
         session.close();
     }
 }