依赖导入

<!-- hibernate 核心 -->
<dependency>
    <groupId>org.hibernate.orm</groupId>
    <artifactId>hibernate-core</artifactId>
    <version>6.2.7.Final</version>
</dependency>

<!--  jdbc 实现 -->
<dependency>
    <groupId>com.mysql</groupId>
    <artifactId>mysql-connector-j</artifactId>
    <version>8.0.33</version>
</dependency>

配置文件

<?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>
    <!-- 会话工厂 -->
    <session-factory>
        <!-- 链接参数 -->
        <property name="hibernate.connection.driver_class">com.mysql.cj.jdbc.Driver</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/jpa_study?useSSL=true&amp;useUnicode=true&amp;characterEncoding=utf-8&amp;serverTimezone=Asia/Shanghai</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.connection.password">a1b2c3</property>

        <!-- 显示sql语句 -->
        <property name="show_sql">false</property>
        <!-- 格式化sql -->
        <property name="format_sql">false</property>
        <!-- sql方言 -->
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        <!-- 自动操作：创建-删除 -->
        <property name="hibernate.hbm2ddl.auto">create-drop</property>
        <!-- 配置sessionFactory.getCurrentSession()的上下文 -->
        <property name="current_session_context_class">thread</property>

        <!-- 导入实体类和映射关系 -->
        <mapping class="org.example.entity.User"/>
        <mapping class="org.example.entity.Address"/>
        <mapping class="org.example.entity.Vlog"/>
        <mapping class="org.example.entity.Role"/>
    </session-factory>
</hibernate-configuration>

一对一

User 实体类

@Entity
@Table(name = "user")
@Data
public class User {
  /*...省略其他内容*/
  
  // 关联列的名称：address_id
  @JoinColumn(name = "address_id")
  @OneToOne(
          // 懒加载
          fetch = FetchType.LAZY
  )
  private Address address;
}

Address 实体类

@Entity
@Setter
@Getter
@Table(name = "address")
public class Address {
  /*...省略其他内容*/

  @OneToOne(
      // 实体关联的被拥有者，只想User.address字段
      mappedBy = "address"
  )
  private User user;
}

测试

@Test
public void oneToOneTest() {
    AddressDao addressDao = new AddressDao();// Dao层已经在https://www.cnblogs.com/heirem/p/17616689.html说过了，这里就放代码了
    Address address = new Address();
    address.setDetail("广东中山");
    addressDao.save(address);

    UserDao userDao = new UserDao();
    User user = new User();
    user.setName("张三");
    user.setEmail("zhangsan@email.com");
    userDao.save(user);
    user.setAddress(address);
    userDao.update(user);

    userDao.findAll().forEach(System.out::println);
}

User(id=1, name