Redis 通过字段值查找哈希 [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，但是我想知道有没有办法检索在 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没有索引，没有实现SQL.这是一个键值存储.你提供一个键，它就会给你一个值.

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

希望你能明白.

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