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This article will explain in detail the relevant commands about redis collection for everyone. The content of the article is of high quality. Therefore, Xiaobian shares it with you for reference. I hope that after reading this article, you will have a certain understanding of relevant knowledge.

A Set of Redis is an unordered collection of String types. Collection members are unique, which means that duplicate data cannot occur in the collection.

Redis sets are implemented using hash tables, so adding, deleting, and searching all have O(1) complexity.

The maximum number of members in a collection is 232 - 1 (4294967295, more than 4 billion members per collection).

A Method of Implementing Collective Command

command intsetencoding implementation method hashtable encoding implementation method SADD calls intsetAdd function, adds all new elements to the integer collection calls dictAdd, takes the new element as the key, NULL as the value, adds the key value pair to the dictionary SCARD calls intsetLen function, returns the number of elements contained in the integer collection, this number is the number of elements contained in the collection object calls dictSize function, returns the number of key value pairs contained in the dictionary, This number is the number of elements contained in the collection object. SISMEMBER calls intsetFind function to find the given element in the integer collection. If the element is found in the collection, it means that the element does not exist in the collection. If the element is found, it means that the element does not exist in the collection. Call inisetGet function to return a set element traverse the entire dictionary, use dictGetKey function to return the dictionary key as a set element SRANDMEMBER call intsetRandom function, return an element randomly from the integer set call dictGetRandomKey function, return a dictionary key randomly from the dictionary SPOP call intsetRandom function, take an element randomly from the integer set, and then return this random element to the client, call intsetRemove function, Delete random elements from the integer set Call dictGetRandomKey function, randomly extract a dictionary key from the dictionary, after returning the value of this random dictionary key to the client, call dictDelete function, delete the key value pair corresponding to the random dictionary key from the dictionary Call intsetRemove function, delete all given elements from the integer set Call dictDelete function, Delete all keys from the dictionary for the given element of the key-value pair on the redis collection related command introduction to share here, I hope the above content can be of some help to everyone, you can learn more knowledge. If you think the article is good, you can share it so that more people can see it.

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