Redis

Question

我是 Redis 新手，使用 Spring Boot + Spring Data Redis 示例开发代码。当我保存记录时，我看到 KEYS 被创建并从这些键 4 are HASH、1 ZSET 和 all others are SET.

中创建出来

我没有在Spring文档中看到，每个KEY的含义正在被保存。 .

127.0.0.1:6379> KEYS *
 1) "persons:c5cfd49d-6688-4b83-a9b7-be55dd1c36ad"
 2) "persons:firstname:bran"
 3) "persons:39e14dae-fa23-4935-948f-1922d668d1c2"
 4) "persons:f0b6dd26-8922-4a36-bd2a-792a17dddff7"
 5) "persons:address.city:Achalpur"
 6) "persons:e493385a-64ae-42be-8398-51757153d273:idx"
 7) "persons:053cdfea-e430-4e1c-acbd-ac40050b10cd:idx"
 8) "persons:firstname:rickon"
 9) "persons:e493385a-64ae-42be-8398-51757153d273"
10) "persons:address.country:India"
11) "persons:e7fc3ebe-9b48-48a8-a5f4-33a0e21f782f:idx"
12) "persons:firstname:sansa"
13) "persons:address:location"
14) "persons:firstname:robb"
15) "persons:firstname:jon"
16) "persons:lastname:snow"
17) "persons:e7fc3ebe-9b48-48a8-a5f4-33a0e21f782f"
18) "persons:c5cfd49d-6688-4b83-a9b7-be55dd1c36ad:idx"
19) "persons:lastname:stark"
20) "persons:f0b6dd26-8922-4a36-bd2a-792a17dddff7:idx"
21) "persons:053cdfea-e430-4e1c-acbd-ac40050b10cd"
22) "persons:39e14dae-fa23-4935-948f-1922d668d1c2:idx"
23) "persons:firstname:arya"
24) "persons:83cd4f58-c272-4d81-9023-8c66c8ac34b0:idx"
25) "persons:83cd4f58-c272-4d81-9023-8c66c8ac34b0"
26) "persons:address.city:Nagpur"
27) "persons:firstname:eddard"
28) "persons"

Person.java

@Data
@EqualsAndHashCode(exclude = { "children" })
@NoArgsConstructor
@AllArgsConstructor
@Builder
@RedisHash("persons")
public class Person {

    private @Id String id;
    private @Indexed String firstname;
    private @Indexed String lastname;

    private Gender gender;
    private Address address;

    private @Reference List<Person> children;
}

Address.java

@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
@EqualsAndHashCode
public class Address {

    private @Indexed String city;
    private @Indexed String country;
    private @GeoIndexed Point location;
}

Gender.java

public enum Gender {
    FEMALE, MALE
}

RedisExampleBootApplication.java

@SpringBootApplication
public class RedisExampleBootApplication implements CommandLineRunner{

    @Autowired PersonRepository repository;

    public static void main(String[] args) {
        SpringApplication.run(RedisExampleBootApplication.class, args);
    }

    @Override
    public void run(String... args) throws Exception {  
        Address address1 = Address.builder().city("the north").country("winterfell").location(new Point(52.9541053, -1.2401016)).build();
        Address address2 = Address.builder().city("Casterlystein").country("Westerland").location(new Point(51.5287352, -0.3817819)).build();

        Person eddard = Person.builder().firstname("eddard").lastname("stark").gender(Gender.MALE).address(address1).build();
        Person robb = Person.builder().firstname("robb").lastname("stark").gender(Gender.MALE).address(address2).build();
        Person sansa = Person.builder().firstname("sansa").lastname("stark").gender(Gender.FEMALE).address(address1).build();
        Person arya = Person.builder().firstname("arya").lastname("stark").gender(Gender.FEMALE).address(address2).build();
        Person bran = Person.builder().firstname("bran").lastname("stark").gender(Gender.MALE).address(address1).build();
        Person rickon = Person.builder().firstname("rickon").lastname("stark").gender(Gender.MALE).address(address2).build();
        Person jon = Person.builder().firstname("jon").lastname("snow").gender(Gender.MALE).address(address1).build();

        repository.save(eddard);
        repository.save(robb);
        repository.save(sansa);
        repository.save(arya);
        repository.save(bran);
        repository.save(rickon);
        repository.save(jon);

        List<Person> starks = repository.findByLastname(eddard.getLastname());
        System.out.println("Person ="+starks.size());
    }
}

Answer 1

回答之前，介意分享一下你的RedisTemplate实现代码吗？（或者这是由 @RedisHash 注释生成的？）我自己是 Spring-Data-Redis 的新手，不知道 @RedisHash 注释并想检查一下。

无论如何，基本上这里发生的是 Spring-Data-Redis 存储库将 Person 对象插入到 Redis 原生支持的不同数据结构中，用于不同的目的。

Redis 支持不同的数据结构如：

哈希 Redis 创建一个字符串字段和字符串值的映射来表示整个 Person 对象。如果你这样做 HGETALL persons:{your person id} 它将显示与你的对象相关联的所有不同字段和值 Object

HASH holding property values for id "c5cfd49d-6688-4b83-a9b7-be55dd1c36ad" in keyspace "persons"
设置 Redis 插入基本的原始字符串并根据实体的字段对其进行索引。因此，您的 Redis 数据库中有很多 SET 操作。您可以在数据集中看到 firstName 和 lastName 的索引

SET holding all ids known in the keyspace "persons"
Z集这是对 Sorted Sets 数据结构的 Redis 操作。这是一个有序的字符串集合。来自 Redis 文档

In short with sorted sets you can do a lot of tasks with great performance that are really hard to model in other kind of databases.

好像Spring数据自动插入位置数据作为排序集来优化CRUD操作。

您可以在此处阅读更多内容：

https://github.com/spring-projects/spring-data-examples/blob/master/redis/repositories/README.md

https://redis.io/topics/data-types

Redis - 密钥 HASH 和 SET 以及 ZSET 如何与 CrudRepository 保存相关？

Redis - How the key HASH and SET and ZSET are related on the CrudRepository save?

java

jedis

spring-data-redis