第一步：导包（项目整个架构）：

第二步：创建实体类及其配置文件

Customer

package com.qiuqiu.pojo;

public class Customer {
    private int cus_id;
    private String cus_name;
    private int cus_age;
    //省略get与set方法及其构造方法
}

Customer.hbm.xml（注意名字格式为：类名.hbm.xml)

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="com.qiuqiu.pojo">
   <class name="Customer" table="customer">
      <id column="cus_id" name="cus_id">
        <generator class="native"></generator>
      </id>
      <property name="cus_name" column="cus_name"></property>
      <property name="cus_age" column="cus_age"></property>
   </class>
</hibernate-mapping>

第三步：编写核心配置文件 hibernate.cfg.xml

<?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>
        <!-- 数据库连接配置 -->
        <!-- 数据库驱动配置 -->
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <!-- 数据库连接地址配置url -->
        <property name="hibernate.connection.url">jdbc:mysql:///test</property>
        <!-- 数据库用户名配置 -->
        <property name="hibernate.connection.username">root</property>
        <!-- 数据库密码设置 -->
        <property name="hibernate.connection.password">123</property>

        <!-- hibernate方言配置 -->
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>

        <!-- ddl类型配置为create -->
        <property name="hibernate.hbm2ddl.auto">update</property>

        <!-- sql语句相关配置 -->
        <!-- 配置显示sql语句 -->
        <property name="hibernate.show_sql">true</property>
        <!-- 格式化sql语句 -->
        <property name="hibernate.format_sql">true</property>

        <mapping resource="com/qiuqiu/pojo/Customer.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

(注意方言不要弄错，不然会报错)

第四步：测试

package com.qiuqiu.test;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.junit.Test;

import com.qiuqiu.pojo.Customer;
import com.qiuqiu.utils.SessionUtils;

public class MyTest {

    //保存用户
    @Test
    public void sessionTest(){
        Configuration configure = new Configuration().configure();
        SessionFactory factory = configure.buildSessionFactory();
        Session openSession = factory.openSession();
        Transaction transaction = openSession.beginTransaction();
        Customer customer = new Customer("张艳杰", 20);
        openSession.save(customer);
        transaction.commit();
        openSession.close();
        factory.close();
    }

    //查询id为1的对象
    @Test
    public void selectOne(){
        Configuration configure = new Configuration().configure();
        SessionFactory factory = configure.buildSessionFactory();
        Session openSession = factory.openSession();
        Customer customer = openSession.get(Customer.class, 1);
        System.out.println(customer.toString());
        openSession.close();
        factory.close();
    }

    //修改id为1的信息
    @Test
    public void testModify(){
        Configuration configure = new Configuration().configure();
        SessionFactory factory = configure.buildSessionFactory();
        Session openSession = factory.openSession();
        Customer customer = openSession.get(Customer.class, 1);
        customer.setCus_name("修改后的名字");
        Transaction transaction = openSession.beginTransaction();
        openSession.update(customer);
        transaction.commit();
        openSession.close();
        factory.close();
    }

    //删除id为1的对象
    @Test
    public void delCustomer(){
        Session session = SessionUtils.getSession();
        Transaction transaction = session.beginTransaction();
        Customer customer = session.get(Customer.class, 1);
        session.delete(customer);
        transaction.commit();
    }
}

utils:

package com.qiuqiu.utils;

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

public class SessionUtils {
    
    

    static Configuration configure = new Configuration().configure();
    static SessionFactory sessionFactory = configure.buildSessionFactory();

    public static Session getSession() {
        Session openSession = sessionFactory.openSession();
        return openSession;
    }
}

运行结果输出显示：

测试hibernate的一级缓存

一级缓存：

@Test
    public void selectOne(){
        Configuration configure = new Configuration().configure();
        SessionFactory factory = configure.buildSessionFactory();
        Session openSession = factory.openSession();
        System.out.println("第一次开始查询id为2的用户");
        Customer customer = openSession.get(Customer.class, 2);
        System.out.println(customer.toString());
        System.out.println("第二次开始查询id为2的用户");
        Customer customer1 = openSession.get(Customer.class, 2);
        System.out.println(customer1.toString());
        openSession.close();
        factory.close();
    }

可以看到我们进行了一次查询