hibernate之环境筹建

hibernate之环境搭建
[size=xx-small;]开发环境搭建的步骤[/size]

1、新建java项目

2、创建User Library,加入如下jar
   * HIBERNATE_HOME/hibernate3.jar
   * HIBERNATE_HOME/lib/*.jar
   * MySql jdbc驱动

3、创建hibernate配置文件hibernate.cfg.xml，为了便于调试最好加入log4j配置文件

4、定义实体类

5、定义User类的映射文件User.hbm.xml

6、开发客户端(编写测试类)



hibernate.cfg.xml

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
    <!-- 方言 -->
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
        <!-- 数据库连接 -->
        <property name="connection.url">jdbc:mysql://localhost:3306/db_database14</property>
        <!-- 数据库连接用户名 -->
        <property name="connection.username">root</property>
        <!-- 数据库连接密码 -->
        <property name="connection.password">admin</property>
        <!-- 数据库驱动 -->
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <!-- 打印SQL语句 -->
        <property name="show_sql">true</property>
        <!-- 自动建表 -->
        <property name="hibernate.hbm2ddl.auto">update</property>
        <!-- 映射文件 -->
        <mapping resource="com/java0806/User.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

实体类User.java

package com.java0806.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;
}
}



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>
<class name="com.bjsxt.hibernate.User">
<id name="id">
<generator class="uuid"/>
</id>
<property name="name"/>
<property name="password"/>
<property name="createTime"/>
<property name="expireTime"/>
</class>
</hibernate-mapping>


编写测试类Client.java

package com.java0806.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();

//创建SessionFactory
SessionFactory factory = cfg.buildSessionFactory();

Session session = null;
try {
session = factory.openSession();

//开启事务
session.beginTransaction();

User user = new User();
user.setName("张三");
user.setPassword("123");
user.setCreateTime(new Date());
user.setExpireTime(new Date());

//保存数据
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();
}
}
}
}
}