Redis 按字段值查找哈希值 [英] Redis finding hashes by field values

问题描述

当使用 Redis 创建记录"时，您可以创建一个包含多个字段的哈希.例如:

When using Redis in order to create a "record" you can create a hash with several fields. For example:

HMSET myhash field1 "Hello" field2 "World"
HMSET myhash2 field1 "Goodbye" field2 "World"

您可以通过知道键值来检索它，但是我想知道有什么方法可以检索 field2 中具有World"的所有哈希?

You can retrieve this by knowing the key values, however what I want to know is there any way to retrieve all hashes that have "World" in field2?

推荐答案

redis 中没有索引，也没有实现 SQL.这是一个键值存储.您提供一个密钥，它为您提供一个值.

There are no indexes in redis, and it doesn't implement SQL. It's a key-value store. You provide a key, it gets you a value.

也就是说，您可以通过自己维护二级索引来实现这一点.例如:

That said, you can implement this by maintaining secondary indexes yourself. For example:

创建记录和索引条目

HMSET myhash field1 Hello field2 World
SADD field2_world myhash

更新一条记录，删除旧的索引条目，创建一个新的

update a record, delete old index entry, create new one

SREM field2_world myhash
HMSET myhash field2 Mundo
SADD field2_mundo myhash

在field2

SMEMBERS field2_world

我希望你能明白.

这篇关于Redis 按字段值查找哈希值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！