hibernate入门(一)

1:User

package com.itcast.hibernate.domain;


import java.util.Date;


public class User {
private int id; //自然主键(非业务属性)
private String name;
private Date birthday;
public User() {
}
public User(String name, Date birthday) {
this.name = name;
this.birthday = 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 [id=" + id + ", name=" + name + ", birthday=" + birthday
+ "]";
}

}

2: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>
<!-- 配置连接数据库的基本信息 -->
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost/hibernate</property>
<property name="connection.username">root</property>
<property name="connection.password">123456</property>
<!-- 配置 hibernate 的基本信息 -->
<!-- hibernate 所使用的数据库方言 -->
<property name="dialect">org.hibernate.dialect.MySQLInnoDBDialect</property>
<!-- 执行操作时是否在控制台打印 SQL -->
<property name="show_sql">true</property>
<!-- 是否对 SQL 进行格式化 -->
<property name="format_sql">true</property>
<!-- 指定自动生成数据表的策略 -->
<property name="hbm2ddl.auto">update</property>
<!-- 指定关联的 .hbm.xml 文件 -->
<mapping resource="com/itcast/hibernate/domain/User.hbm.xml"/>
</session-factory>
</hibernate-configuration>

3: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.itcast.hibernate.domain">
    <class name="User" table="user" dynamic-insert="true">
        <id name="id" type="int">
            <column name="id" />
            <!-- 指定主键的生成方式, native: 使用数据库本地方式 -->
            <generator class="native" />
        </id>
        <property name="name" length="30" type="java.lang.String">
        <column name="name"/>
        </property>
        <property name="birthday" type="java.util.Date">
            <column name="birthday"/>
        </property>
    </class>
</hibernate-mapping>

4:Test

package com.itcast.hibernate.test;


import java.util.Date;
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 org.junit.Test;
import com.itcast.hibernate.domain.User;
public class TestHibernate {
@Test
public void testUser() {
//1. 创建一个 SessionFactory 对象
SessionFactory sessionFactory = null;
//1). 创建 Configuration 对象: 对应 hibernate 的基本配置信息和 对象关系映射信息
Configuration configuration = new Configuration().configure("hibernate.cfg.xml");
//4.0 之前这样创建
// sessionFactory = configuration.buildSessionFactory();

//2). 创建一个 ServiceRegistry 对象: hibernate 4.x 新添加的对象
//hibernate 的任何配置和服务都需要在该对象中注册后才能有效.
ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties())
 .buildServiceRegistry();
//3).
sessionFactory = configuration.buildSessionFactory(serviceRegistry);
//2. 创建一个 Session 对象
Session session = sessionFactory.openSession();
//3. 开启事务
Transaction transaction = session.beginTransaction();
//4. 执行保存操作
User user=new User();
user.setId(2);
user.setName("小月");
user.setBirthday(new java.sql.Date(new Date().getTime()));
session.save(user);//insert语句
//5. 提交事务 
transaction.commit();
//6. 关闭 Session
session.close();
//7. 关闭 SessionFactory 对象
sessionFactory.close();
}
}