如何在 Spring Data 中将 Java 实体映射到多个 MongoDB 集合? [英] How to Map a Java Entity to Multiple MongoDB Collections in Spring Data?

问题描述

目前，我们正在寻找一种解决方案，将以下 User 实体同时保存到多个 MongoDB 集合中(即 db_users 和 db_users_legacy).两个集合都在同一个数据库中.

Currently, we're looking for a solution to save the following User entity into multiple MongoDB collections at the same time (i.e. db_users and on db_users_legacy). Both collections are in the same database.

请不要问我为什么需要保存在两个集合中.这是业务需求.

Please don't ask me the reason why I need to save in two collections. It is a business requirement.

@Document(collection = "db_users")
@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {

    @Id
    private String id;
    private String name;
    private String website;
    private String name;
    private String email;

}

我的 SpringBoot 应用程序配置如下；

And my SpringBoot application configuration goes as;

@Configuration
public class ApplicationConfig {

    @Bean
    public MongoTemplate mongoTemplate(MongoDbFactory factory){
        MongoTemplate template = new MongoTemplate(factory);
        template.setWriteConcern(WriteConcern.ACKNOWLEDGED);
        retu,rn template;
    }

}

目前我的存储库看起来像这样.并且保存工作得很好.如何在两个不同的集合中相同此文档?

Currently my repository looks as this. And saving works perfectly fine. How can I same this document in two different collections?

@Repository
public class UserRepositoryImpl implements UserRepository {

    private MongoTemplate mongoTemplate;

    public UserRepositoryImpl(MongoTemplate mongoTemplate) {
        this.mongoTemplate = mongoTemplate;
    }

    @Override
    public void save(User user) {
        mongoTemplate.save(user);
    }

}

有人可以建议最好的选择来解决这个问题吗?

Can anyone suggest the best option to deal with this, please?

推荐答案

我建议使用 MongoTemplate 的另一个 重载保存方法.

I suggest using MongoTemplate's the other overloaded save method.

@Override
public void save(User user) {
    mongoTemplate.save(user, "db_users");
    mongoTemplate.save(user, "db_users_legacy");
}

这可用于将同一对象保存到多个集合中.来自文档，

This can be used to save same object to multiple collections. From docs,

您可以通过使用 @Document 批注提供不同的集合名称来自定义它.您还可以通过提供您自己的集合名称作为所选 MongoTemplate 方法调用的最后一个参数来覆盖集合名称.

You can customize this by providing a different collection name using the @Document annotation. You can also override the collection name by providing your own collection name as the last parameter for the selected MongoTemplate method calls.

因此，@Document 中专门提供的集合名称无关紧要，您始终可以使用 MongoTemplate 覆盖它.

So it doesn't matter the collection name specifically provided in @Document, you can always override it using MongoTemplate.

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