Hibernate Helloworld教程

1、环境配置

(1)在myeclipse下新建一普通Java Project。

        (2)新建lib文件夹，并将hibernate和mysql所需jar包导入lib文件夹，并build path。

2、在mysql数据库中建表

sql语句如下：

use test;create table employee(id int NOT NULL auto_increment, name VARCHAR(10), email varchar(20), PRIMARY KEY(id))charset=utf8;

3、创建持久化类(POJO)

在com.sdust.www.domain包下创建Employee类

package com.sdust.www.domain;public class Employee{private Integer id;private String name;private String email;public Integer getId(){return id;}public void setId(Integer id){this.id = id;}public String getName(){return name;}public void setName(String name){this.name = name;}public String getEmail(){return email;}public void setEmail(String email){this.email = email;}public Employee(String name, String email){super();this.name = name;this.email = email;}public Employee(){}@Overridepublic String toString(){return "Employee [id=" + id + ", name=" + name + ", email=" + email+ "]";}}

4、创建对象关系映射文件

在com.sdust.www.domain包下创建Employee.hbm.xml文件

<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-mapping PUBLIC"-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"><hibernate-mapping package="com.sdust.www.domain"><class name="Employee" table="employee"><!-- id用于指定主键属性 --><id name="id" column="id" type="java.lang.Integer"> <generator class="native"></generator></id><!-- 其它属性的配置 --><property name="name" type="java.lang.String"><column name="name" not-null="false"></column></property><property name="email" type="java.lang.String"><column name="email" not-null="false"></column></property></class></hibernate-mapping>

5、创建Hibernate配置文件

在src目录下创建hibernate.cfg.xml文件

<?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:///test</property>    <property name="connection.username">root</property>    <property name="connection.password">123456</property>    <!-- JDBC connection pool (use the built-in) -->    <!--<property name="connection.pool_size">1</property>-->    <!-- SQL dialect -->    <property name="dialect">org.hibernate.dialect.MySQLInnoDBDialect</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>    <mapping resource="com/sdust/www/domain/Employee.hbm.xml"/>  </session-factory></hibernate-configuration>

6、通过Hibernate API编写访问数据库代码

package com.sdust.www.view;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.Transaction;import org.hibernate.cfg.Configuration;import org.hibernate.service.ServiceRegistry;import org.hibernate.service.ServiceRegistryBuilder;import com.sdust.www.domain.Employee;public class TestMain{public static void main(String[] args){//1、创建SessionFactory对象Configuration configuration = new Configuration().configure();ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);//2、创建session对象(相当于jdbc connection)Session session = sessionFactory.openSession();//3、开启事务Transaction transaction = session.beginTransaction();//4、执行保存操作Employee employee = new Employee();employee.setName("whc");employee.setEmail("[e-mail]");session.save(employee);//5、提交事务transaction.commit();//6、关闭sessionsession.close();//7、关闭sessionFactory对象sessionFactory.close();}}

7、查看结果

程序运行完成后，可在mysql可看到employee表中增加了一条记录。