Redis Set: Get Value Easily（redisset取值）

Redis is an open source and highly scalable key-value database. It supports data structures such as strings, hashes, lists and sets. Its set data structure supports powerful operations such as Union, Intersection, Difference, and many more. In this article, we will discuss Redis Set and its Get Value operation.

Redis Set is a collection of unique and non-repeating values. It works like an array in which elements are stored in no particular order. Redis Set stores each element exactly once so it ensures that each element is unique and no repetition occurs. Redis Set provides an easy way to get elements from the collection.

The GET command is used to get values associated with set elements. It takes two arguments, the set key and the element we are looking for. If the element exists in the set, Redis will return the element value. Otherwise, it will return nil. Below is an example code that shows how to use the GET command with a Redis Set.

# Get a value from a Redis set
redisClient.get('SetKey', 'ValueToGet')

The RAISEMEMBER command can also be used to get values associated with set elements. It takes three arguments, the set key,element and the amount for the increment or decrement. It can be used to add, subtract or compare values associated with the set elements. Below is an example code that shows how to use the RAISEMEMBER command with a Redis Set.

# Raise/Decrease a value from a Redis set
redisClient.raisemember('SetKey', 'ValueToGet', 10)

Another way to get values from the Redis Set is to use the Member command. It takes two arguments, the set key and the element itself. If the element exists in the set, Redis will return the element value. Otherwise, it will return nil. Below is an example code that shows how to use the MEMBER command with a Redis Set.

# Get a value from a Redis set
redisClient.member('SetKey', 'ValueToGet')

In summary, Redis Set is an easy and powerful way to store unique elements and get values associated with them quickly. Redis offers several commands such as GET, RAISEMEMBER and MEMBER to make it easy to get values associated with set elements. In this article, we have discussed Redis Set and its Get Value operation. With these commands, you can easily get values from Redis Set quickly and efficiently.