Redis common command manual

Redis Commands can be roughly divided into the following ：
Server side （server） command
client （client） command
Key command （key）
Data type command
Function application command

This book 《Redis Common command manual 》 It introduces Redis Commands often used in , Including key commands and data type commands , The data type commands include String、List、Hash、Set as well as Sorted Set.
key （Key） command
We know Redis yes key-value Type database , Use key Yes value For storage , therefore , key （Key） The order is Redis A class of commands often used in . Common key commands are as follows ：
Hash command
Hash（ Hash hash ） yes Redis One of the basic data types , It is stored in the form of a string mapping table .Hash Ideal for storing objects . The common commands are as follows ：
String command
Strings（ character string ） Structure is Redis One of the basic data types of , We can operate on it through related string commands , Setting up 、 retrieval 、 Delete and so on . String types have many application scenarios , For example, the attention and cancellation of microblog fans .

Here's how Redis String command in Changying ：
List command
List yes Redis One of the most commonly used data types in .Redis Provides a number of commands for manipulating list types , With these commands, you can add an element to the head of the list , Or tail and many other operations .

List The common commands are as follows ：
Set command
Redis set Data types consist of key value pairs , These key value pairs have unordered 、 The only property , This is related to Python Of set be similar . When the last element in the collection is removed , The data structure will also be automatically deleted , Memory will also be reclaimed .

because set Sets can achieve de duplication , So it has many applicable scenarios , For example, user lottery activities , Use set Set can ensure that the same user is not selected for the second time .

Redis set The common commands are as follows ：
Zset command
zset yes Redis One of the most distinctive data types provided , First of all, it's a set, This ensures internal value Uniqueness of value , Second, it gives everyone value Added a score（ The score is ） attribute , The ordering is realized by sorting the scores . For example, use zset Structure to store students' grades ,value The value represents the student's ID,score It's your test results . We can sort the grades according to the scores to get the students' ranking .

The following is listed zset Common commands , As shown below ：