Hibernate二

package cn.hibernate3.demo1;
/**
 * 实体类
 * @author love
 */
public class Book {
    private Integer id;
    private String name;
    private Double price;
    private String author;
    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 Double getPrice() {
        return price;
    }
    public void setPrice(Double price) {
        this.price = price;
    }
    public String getAuthor() {
        return author;
    }
    public void setAuthor(String author) {
        this.author = author;
    }
    
}

<?xml version="1.0" encoding="UTF-8"?>
<!-- 引入约束 -->
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
    <class name="cn.hibernate3.demo1.Book" table="book">
        <id name="id" column="id">
            <generator class="native"/>
        </id>
        <property name="name" column="name" type="java.lang.String"/>
        <property name="price" column="price" type="java.lang.Double"/>
        <property name="author" column="author" type="java.lang.String"/>
    </class>
</hibernate-mapping>

<?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>
    <!-- 配置数据库的基本信息 -->
    <!-- 驱动的名称 -->
    <property name="hibernate.connection.driver_class">
        com.mysql.jdbc.Driver
    </property>
    <!-- 访问数据库的url -->
    <property name="hibernate.connection.url">
        jdbc:mysql:///hibernate_day02
    </property>
    <!-- 用户名 -->
    <property name="hibernate.connection.username">root</property>
    <!-- 密码 -->
    <property name="hibernate.connection.password">root</property>
    <!-- 方言 -->
    <property name="hibernate.dialect">
        org.hibernate.dialect.MySQLDialect
    </property>
    <!-- C3P0连接池设定-->
    <!-- 使用c3po连接池  配置连接池提供的供应商-->
    <property name="connection.provider_class">
        org.hibernate.connection.C3P0ConnectionProvider
    </property>
    <!--在连接池中可用的数据库连接的最少数目 -->
    <property name="c3p0.min_size">5</property>
    <!--在连接池中所有数据库连接的最大数目  -->
    <property name="c3p0.max_size">20</property>
    <!--设定数据库连接的过期时间,以秒为单位,
        如果连接池中的某个数据库连接处于空闲状态的时间超过了timeout时间,就会从连接池中清除 -->
    <property name="c3p0.timeout">120</property>
    <!--每3000秒检查所有连接池中的空闲连接 以秒为单位-->
    <property name="c3p0.idle_test_period">3000</property>
    <!-- 可选配置 -->
    <!-- 显示SQL -->
    <property name="hibernate.show_sql">true</property>
    <!-- 格式化SQL -->
    <property name="hibernate.format_sql">true</property>
    <!-- hbm:映射 2:to ddl:create drop alter -->
    <property name="hibernate.hbm2ddl.auto">update</property>
    <mapping resource="cn/hibernate3/demo1/Book.hbm.xml" />
</session-factory>
</hibernate-configuration>

package cn.utils;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

/**
 * Hibernate抽取工具类
 */
public class HibernateUtils {
    private static Configuration configuration;
    private static SessionFactory sessionFactory;
    static{
        configuration = new Configuration().configure();
        sessionFactory = configuration.buildSessionFactory();
    }
    
    
    public static Session openSession(){
        return sessionFactory.openSession();
    }
    
    public static void main(String[] args) {
        openSession();
    }
}

package cn.hibernate3.demo1;

import org.hibernate.Session;
import org.hibernate.Transaction;
import org.junit.Test;

import cn.utils.HibernateUtils;

public class HibernateTest1 {
    @Test
    //区分持久化对象的三种装填
    public void demo1(){
        Session session = HibernateUtils.openSession();
        Transaction tx = session.beginTransaction();
        
        //向数据库中保存一本图书
        Book book = new Book();//瞬时态：没有唯一标识OID，没有与session关联
        book.setName("Hibernate开发");
        book.setAuthor("哈哈");
        book.setPrice(65.0);
        
        session.save(book);//持久态：有唯一标识OID，与session关联
        
        
        
        tx.commit();
        session.close();
        
        book.setName("Struts2开发");//脱管态：有唯一标识，没有与session关联
        
        
    }
}