初学hibernate，基本配置

<?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>
        <!-- Database connection settings -->
        <property name="connection.driver_class">com.microsoft.sqlserver.jdbc.SQLServerDriver</property>
        <property name="connection.url">jdbc:sqlserver://localhost:1433;databaseName=student</property>
        <property name="connection.username">sa</property>
        <property name="connection.password">1111</property>
        
             <!-- JDBC connection pool (use the built-in) -->
       <!--   <property name="connection.pool_size">1</property> -->
        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.SQLServerDialect</property>
        <!-- Enable Hibernate‘s automatic session context management -->
        <!-- <property name="current_session_context_class">thread</property> -->
        
        <!-- Disable the second-level cache  -->
        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>
        <!-- Drop and re-create the database schema on startup -->
        <property name="hbm2ddl.auto">update</property>
        <!-- <mapping resource="yg/model/Stu.hbm.xml"/>  -->
        <mapping class="yg.model.Stu" />
    </session-factory>
</hibernate-configuration>

package yg.model;

import javax.persistence.Entity;
import javax.persistence.Id;

@Entity
public class Stu {

    private int id;
    private String name;
    private int age;
    
    
    public int getAge() {
        return age;
    }
    
    @Id
    public int getId() {
        return id;
    }
    public String getName() {
        return name;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public void setId(int id) {
        this.id = id;
    }
    public void setName(String name) {
        this.name = name;
    }
}

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;

import yg.model.Stu;



public class StuTest {
    public static void main(String[] args) {
        Stu s = new Stu();
        s.setId(1);
        s.setName("s1");
        s.setAge(1);
        
        Configuration cfg = new AnnotationConfiguration();
        SessionFactory sf = cfg.configure().buildSessionFactory();
        Session session = sf.openSession();
        session.beginTransaction();
        session.save(s);
        session.getTransaction().commit();
        session.close();
        sf.close();
        
    }
}