java中Hibernate中的数据库对象详解

<hibernate-configuration>
<session-factory>
    <!-- 配置数据库方言 -->
    <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    <!-- 配置数据库的驱动 -->
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    <!-- 配置数据库用户名 -->
    <property name="hibernate.connection.username">root</property>
    <!-- 配置数据库的密码 -->
    <property name="hibernate.connection.password">root</property>
    <!-- 配置数据库的url -->
    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate</property>
    <!-- 配置数据池的最大容量 -->
    <property name="hibernate.c3p0.max_size">20</property>
    <!-- 配置数据池的最小容量 -->
    <property name="hibernate.c3p0.min_size">1</property>
    <!-- 配置数据链接的超时界限 -->
    <property name="hibernate.c3p0.timeout">5000</property>
    <!-- 在控制台显示后台是否打印执行的sql -->
    <property name="hibernate.show_sql">true</property>
    <!-- 是否以友好的格式显示打印的sql -->
    <property name="hibernate.format_sql">true</property>
    <!-- 打印一些辅助性的注释 -->
    <property name="hibernate.use_sql_comments">true</property>

    <property name="hibernate.c3p0.max_statements">100</property>
    <property name="hibernate.c3p0.idle_test_period">3000</property>
    <property name="hibernate.c3p0.acquire_increment">2</property>
    <property name="hibernate.c3p0.validate">true</property>
    <!-- 配置数据操作的方式 -->
    <property name="hbm2ddl.auto">create</property>
    <!-- 将我们上面 pen 的映射文件添加进来 -->
    <mapping resource="org/Rudiment/hibernate/pen.hbm.xml" />
</session-factory>
</hibernate-configuration>

public class pen {
    private int id;
    private int price;
    private String type;
   
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public int getPrice() {
        return price;
    }
    public void setPrice(int price) {
        this.price = price;
    }
    public String getType() {
        return type;
    }
    public void setType(String type) {
        this.type = type;
    }
}

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;

public class penHandler {
    public static void main(String[] args)
    {
        Configuration conf = new Configuration();
        conf.configure();
        ServiceRegistry sr = new ServiceRegistryBuilder().applySettings(conf.getProperties()).buildServiceRegistry();
        SessionFactory sf = conf.buildSessionFactory(sr);
    }
}