Redis简介与基础命令

layout: post
title: Redis简介与基础命令
date: 2018-03-22
tags: [“Redis”,”软件服务”]

一、Redis简介

Redis is an open source (BSD licensed), in-memory data structure store, used as a database, cache and message broker. It supports data structures such as strings, hashes, lists, sets, sorted sets with range queries, bitmaps, hyperloglogs and geospatial indexes with radius queries.

Redis has built-in replication, Lua scripting, LRU eviction, transactions and different levels of on-disk persistence, and provides high availability via Redis Sentinel and automatic partitioning with Redis Cluster.

注意：只有3.x的版本支持redis-cluster功能，老点的2.x并不支持（cluster非replication）

二、data structure base command

1、string类型value的操作

 SET     设置字符串键值
 GET     获取字符串键值
 EXISTS  判断键值是否存在
 INCR    当前值加1（inter类型）
 DECR    当前值减1（inter类型）
 SETNX   Set the value of a key, only if the key does not exist
 SETEX   设置密钥的值和到期日期
 INCRBYFLOAT Increment the float value of a key by the given amount
 MGET    获取多个值
 MSET    设置多个值

2、list类型value的操作

 LPUSH   在栈左方插入数据
 RPUSH   在栈右方插入数据
 LPOP    左方栈弹出数据
 RPOP    右方栈弹出数据
 LPUSHX  Prepend a value to a list, only if the list exists
 RPUSHX  Prepend a value to a list, only if the list exists
 LRANGE  Get a range of elements from a list
 LINDEX  Get an element from a list by its index
 LSET    Set the value of an element in a list by its index

3、set类型value的操作

 SADD   添加集合
 SPOP   从集合中随机弹出元素
 SREM   Remove one or more members from a set
 SRANDMEMBER  Get one or multiple random members from a set
 SINTER Intersect multiple sets（交集）
 SUNION 并集

4、sort set 类型value的操作

 ZADD  Add one or more members to a sorted set, or update its score if it already exists
 ZCARD Get the number of members in a sorted set
 ZCOUNT Count the members in a sorted set with scores within the given values
 ZRANK  Determine the index of a member in a sorted set

5、hash类型value的操作

 HSET  Set the string value of a hash field
 HMSET Set multiple hash fields to multiple values
 HGET  Get the value of a hash field
 HMGET  Get the values of all the given hash fields
 HKEYS  Get all the fields in a hash
 HVALS  Get all the values in a hash
 HDEL  Delete one or more hash fields
 HGETALL  Get all the fields and values in a hash

6、pubsub

 PUBLISH     Post a message to a channel
 SUBSCRIBE   Listen for messages published to the given channels
 UNSUBSCRIBE Stop listening for messages posted to the given channels
 PSUBSCRIBE  Listen for messages published to channels matching the given patterns
 PUNSUBSCRIBE Stop listening for messages posted to channels matching the given patterns

三、Redis System Command