编写Hibernate5的配置文件hibernate.cfg.xml，编写加载配置文件的类HibernateSessionFactory，编写持久化类Teachinfo和映射文件Teachinfo.hbm.xml，编写一个类名为TeacherDao的JavaBean，该类封装了对教师信息的增删改查操作。

以下是Hibernate5的配置文件hibernate.cfg.xml：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
  <session-factory>
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/testdb</property>
    <property name="hibernate.connection.username">root</property>
    <property name="hibernate.connection.password">root</property>
    <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    <property name="hibernate.show_sql">true</property>
    <property name="hibernate.hbm2ddl.auto">update</property>
  </session-factory>
</hibernate-configuration>

接下来是加载配置文件的类HibernateSessionFactory：

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

public class HibernateSessionFactory {
    private static SessionFactory sessionFactory;

    private HibernateSessionFactory() {
    }

    public static SessionFactory getSessionFactory() {
        if (sessionFactory == null) {
            Configuration configuration = new Configuration();
            configuration.configure("hibernate.cfg.xml");
            sessionFactory = configuration.buildSessionFactory();
        }
        return sessionFactory;
    }
}

然后是持久化类Teachinfo和映射文件Teachinfo.hbm.xml：

Teachinfo.java

public class Teachinfo {
    private int id;
    private String name;
    private int age;
    private String sex;

    public Teachinfo() {
    }

    public Teachinfo(int id, String name, int age, String sex) {
        this.id = id;
        this.name = name;
        this.age = age;
        this.sex = sex;
    }

    // 省略getter和setter方法
}

Teachinfo.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN" "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
  <class name="Teachinfo" table="teachinfo">
    <id name="id" column="id">
      <generator class="native"/>
    </id>
    <property name="name" column="name"/>
    <property name="age" column="age"/>
    <property name="sex" column="sex"/>
  </class>
</hibernate-mapping>

最后是TeacherDao类，封装了对教师信息的增删改查操作：

import org.hibernate.Session;
import org.hibernate.Transaction;

public class TeacherDao {
    public void add(Teachinfo teachinfo) {
        Session session = HibernateSessionFactory.getSessionFactory().getCurrentSession();
        Transaction tx = session.beginTransaction();
        session.save(teachinfo);
        tx.commit();
    }

    public void delete(int id) {
        Session session = HibernateSessionFactory.getSessionFactory().getCurrentSession();
        Transaction tx = session.beginTransaction();
        Teachinfo teachinfo = (Teachinfo) session.load(Teachinfo.class, id);
        session.delete(teachinfo);
        tx.commit();
    }

    public void update(Teachinfo teachinfo) {
        Session session = HibernateSessionFactory.getSessionFactory().getCurrentSession();
        Transaction tx = session.beginTransaction();
        session.update(teachinfo);
        tx.commit();
    }

    public Teachinfo getById(int id) {
        Session session = HibernateSessionFactory.getSessionFactory().getCurrentSession();
        Transaction tx = session.beginTransaction();
        Teachinfo teachinfo = (Teachinfo) session.get(Teachinfo.class, id);
        tx.commit();
        return teachinfo;
    }
}