ImplicitNamingStrategy 是在 JPA 之外 Hibernate 特有的方式。也可以处理 Multiple embeddable types 。

使用 org.hibernate.boot.model.naming.ImplicitNamingStrategyComponentPathImpl

package org.example.demo.hibernate;

import javax.persistence.Embeddable;
import javax.persistence.Embedded;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.Metadata;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.model.naming.ImplicitNamingStrategyComponentPathImpl;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.service.ServiceRegistry;

public class Test {
    public static void main(String[] args) {
        ServiceRegistry standardRegistry = new StandardServiceRegistryBuilder()
                .applySetting("hibernate.connection.url", "jdbc:p6spy:postgresql://localhost:5432/test")
                .applySetting("hibernate.connection.username", "postgres")
                .applySetting("hibernate.connection.password", "postgres")
                .applySetting("hibernate.hbm2ddl.auto", "create").build();
        Metadata metadata = new MetadataSources(standardRegistry).addAnnotatedClass(Contact.class).getMetadataBuilder()
                .applyImplicitNamingStrategy(ImplicitNamingStrategyComponentPathImpl.INSTANCE).build();
        SessionFactory sessionFactory = metadata.getSessionFactoryBuilder().build();
        Session session = sessionFactory.openSession();

        session.beginTransaction();
        Contact contact = new Contact();
        contact.home = new Address();
        contact.home.addr = "Beijing";
        contact.home.zipcode = "100000";
        contact.work = new Address();
        contact.work.addr = "Shanghai";
        contact.work.zipcode = "200000";
        session.persist(contact);
        session.getTransaction().commit();

        session.close();
        sessionFactory.close();
    }

    @Entity(name = "Contact")
    public static class Contact {
        @Id
        @GeneratedValue
        Integer id;
        @Embedded
        Address home;
        @Embedded
        Address work;
    }

    @Embeddable
    public static class Address {
        String addr;
        String zipcode;
    }
}

生成 SQL

drop table if exists Contact cascade
drop sequence if exists hibernate_sequence

create sequence hibernate_sequence start 1 increment 1
create table Contact (id int4 not null, home_addr varchar(255), home_zipcode varchar(255), work_addr varchar(255), work_zipcode varchar(255), primary key (id))
select nextval ('hibernate_sequence')
insert into Contact (home_addr, home_zipcode, work_addr, work_zipcode, id) values ('Beijing', '100000', 'Shanghai', '200000', 1)