Redis中SADD的使用方法

Question

我找到了这个很好的例子，我正在尝试建立哈希之间的关系，然后获取一些数据。

# Here are my categories
> hmset category:1 name cinema  ... more fields ...
> hmset category:2 name music   ... more fields ...
> hmset category:3 name sports  ... more fields ...
> hmset category:4 name nature  ... more fields ...

# Here are my users
> hmset user:1 name Jack   ... more fields ...
> hmset user:2 name John   ... more fields ...
> hmset user:3 name Julia  ... more fields ...

# Let's establish the many-to-many relationship
# Jack likes cinema and sports
# John likes music and nature
# Julia likes cinema, music and nature

# For each category, we keep a set of reference on the users
> sadd category:1:users 1 3
> sadd category:2:users 2 3
> sadd category:3:users 1
> sadd category:4:users 2 3

# For each user, we keep a set of reference on the categories
> sadd user:1:categories 1 3
> sadd user:2:categories 2 4
> sadd user:3:categories 1 2 4


# Categories of Julia
> smembers user:3:categories
1) "1"
2) "2"
3) "4"

如果我想获取分类名称怎么办？

smembers user:3:categories name

没成功？

Answer 1

一种在一次往返中完成此操作的简单方法是使用：

SORT user:3:categories BY nosort GET category:*->name

Redis中SADD的使用方法

How to use SADD in Redis

database

relationship

redis