一个简单的hibernate项目
准备工作
工具准备
- hibernate3.5.3
- Eclipse Java EE IDE for Web Developers.Version: Helios
- MySQL5.5
环境配置搭建
- 安装并配置好Eclipse、JRE等环境。配置好系统环境变量
- 下载hibernate版本
创建简单的数据库
MySQL创建数据库表
create database testssh;
use testssh;
create table user(
u_id int not null auto_increment,
u_name varchar(30),
primary key(u_id)
);
创建hibernate项目流程
1.File->New->Dynamic Web Project->填写项目信息(hibernatedemo)->finish
本例项目名称为hibernatedemo
2.复制hibernate jar包到项目hibernatedemo/WebContent/WEB-INF/lib下
3.在src目录下编写hibernate.cfg.xml,配置数据库信息
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory >
<property name="connection.url">jdbc:mysql://localhost:3300/testssh</property>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.username">root</property>
<property name="connection.password">123456</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="show_sql">true</property>
<property name="format_sql">true</property>
<mapping resource="com/entity/User.hbm.xml" />
</session-factory>
</hibernate-configuration>
4.src下新建包com.entity用于实体对象,编写类User,在同一目录下编写User.hbm.xml映射文件。这里使用XML配置映射,亦可以使用注解方式映射数据库表。
User.java
package com.entity;
public class User {
private Integer id;
private String name;
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;
}
}
编写好User.hbm.xml,并将mapping配置到hibernate.cfg.xml中
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping
package="com.entity">
<class name="User" table="user" >
<id name="id" column="u_id">
<generator class="native"/>
</id>
<property name="name" column="u_name"/>
</class>
</hibernate-mapping>
5.测试。com.test包中编写测试类
public class Testhibernate {
public static void main(String[] args) {
Configuration cfg=new Configuration().configure();
SessionFactory sf=cfg.buildSessionFactory();
Session session =sf.openSession();
Transaction tx=session.beginTransaction();
User user=(User)session.get(User.class, 1);
System.out.println(user.getId());
System.out.println(user.getName());
session.close();
sf.close();
}
}
6.成功输出,整个hibernate项目创建配置流程finished!