Redis相关笔记（1） 基本数据类型

Redis相关笔记

Redis数据类型及相对应操作

帮助文档查看方法（redis-cli）

> help [命令或元组名称]

String

APPEND key value
summary: Append a value to a key
since: 2.0.0

BITCOUNT key [start end]
summary: Count set bits in a string
since: 2.6.0

BITFIELD key [GET type offset] [SET type offset value] [INCRBY type offset increment] [OVERFLOW WRAP|SAT|FAIL]
summary: Perform arbitrary bitfield integer operations on strings
since: 3.2.0

BITOP operation destkey key [key ...]
summary: Perform bitwise operations between strings
since: 2.6.0

BITPOS key bit [start] [end]
summary: Find first bit set or clear in a string
since: 2.8.7

DECR key
summary: Decrement the integer value of a key by one
since: 1.0.0

DECRBY key decrement
summary: Decrement the integer value of a key by the given number
since: 1.0.0

GET key
summary: Get the value of a key
since: 1.0.0

GETBIT key offset
summary: Returns the bit value at offset in the string value stored at key
since: 2.2.0

GETDEL key
summary: Get the value of a key and delete the key
since: 6.2.0

GETEX key [EX seconds|PX milliseconds|EXAT timestamp|PXAT milliseconds-timestamp|PERSIST]
summary: Get the value of a key and optionally set its expiration
since: 6.2.0

GETRANGE key start end
summary: Get a substring of the string stored at a key
since: 2.4.0

GETSET key value
summary: Set the string value of a key and return its old value
since: 1.0.0

INCR key
summary: Increment the integer value of a key by one
since: 1.0.0

INCRBY key increment
summary: Increment the integer value of a key by the given amount
since: 1.0.0

INCRBYFLOAT key increment
summary: Increment the float value of a key by the given amount
since: 2.6.0

MGET key [key ...]
summary: Get the values of all the given keys
since: 1.0.0

MSET key value [key value ...]
summary: Set multiple keys to multiple values
since: 1.0.1

MSETNX key value [key value ...]
summary: Set multiple keys to multiple values, only if none of the keys exist
since: 1.0.1

PSETEX key milliseconds value
summary: Set the value and expiration in milliseconds of a key
since: 2.6.0

SET key value [EX seconds|PX milliseconds|EXAT timestamp|PXAT milliseconds-timestamp|KEEPTTL] [NX|XX] [GET]
summary: Set the string value of a key
since: 1.0.0

SETBIT key offset value
summary: Sets or clears the bit at offset in the string value stored at key
since: 2.2.0

SETEX key seconds value
summary: Set the value and expiration of a key
since: 2.0.0

SETNX key value
summary: Set the value of a key, only if the key does not exist
since: 1.0.0

SETRANGE key offset value
summary: Overwrite part of a string at key starting at the specified offset
since: 2.2.0

STRALGO LCS algo-specific-argument [algo-specific-argument ...]
summary: Run algorithms (currently LCS) against strings
since: 6.0.0

STRLEN key
summary: Get the length of the value stored in a key
since: 2.2.0

redis的字符数组存在反向索引（正向索引为从自字符串的第一个字符开始从0开始计数，向后一位+1，反向索引为从自负床的最后一位开始向前计数，向前一位-1）

redis二进制安全

redis以字节数组存放数据，防止各种情况的读取。

字符数组（字节数组）

数值型

redis可对一定值内的数值字符串做运算

incr

位图（bitmap）

直接设置一个字节数组的位值（1字节=8bit）

List

BLMOVE source destination LEFT|RIGHT LEFT|RIGHT timeout
summary: Pop an element from a list, push it to another list and return it; or block until one is available
since: 6.2.0

BLPOP key [key ...] timeout
summary: Remove and get the first element in a list, or block until one is available
since: 2.0.0

BRPOP key [key ...] timeout
summary: Remove and get the last element in a list, or block until one is available
since: 2.0.0

BRPOPLPUSH source destination timeout
summary: Pop an element from a list, push it to another list and return it; or block until one is available
since: 2.2.0

LINDEX key index
summary: Get an element from a list by its index
since: 1.0.0

LINSERT key BEFORE|AFTER pivot element
summary: Insert an element before or after another element in a list
since: 2.2.0

LLEN key
summary: Get the length of a list
since: 1.0.0

LMOVE source destination LEFT|RIGHT LEFT|RIGHT
summary: Pop an element from a list, push it to another list and return it
since: 6.2.0

LPOP key [count]
summary: Remove and get the first elements in a list
since: 1.0.0

LPOS key element [RANK rank] [COUNT num-matches] [MAXLEN len]
summary: Return the index of matching elements on a list
since: 6.0.6

LPUSH key element [element ...]
summary: Prepend one or multiple elements to a list
since: 1.0.0

LPUSHX key element [element ...]
summary: Prepend an element to a list, only if the list exists
since: 2.2.0

LRANGE key start stop
summary: Get a range of elements from a list
since: 1.0.0

LREM key count element
summary: Remove elements from a list
since: 1.0.0

LSET key index element
summary: Set the value of an element in a list by its index
since: 1.0.0

LTRIM key start stop
summary: Trim a list to the specified range
since: 1.0.0

RPOP key [count]
summary: Remove and get the last elements in a list
since: 1.0.0

RPOPLPUSH source destination
summary: Remove the last element in a list, prepend it to another list and return it
since: 1.2.0

RPUSH key element [element ...]
summary: Append one or multiple elements to a list
since: 1.0.0

RPUSHX key element [element ...]
summary: Append an element to a list, only if the list exists
since: 2.2.0

list在redis中储存为一个双向环链表，依然支持反向索引

栈 队列 数组

阻塞单播队列

Hash

HDEL key field [field ...]
summary: Delete one or more hash fields
since: 2.0.0

HEXISTS key field
summary: Determine if a hash field exists
since: 2.0.0

HGET key field
summary: Get the value of a hash field
since: 2.0.0

HGETALL key
summary: Get all the fields and values in a hash
since: 2.0.0

HINCRBY key field increment
summary: Increment the integer value of a hash field by the given number
since: 2.0.0

HINCRBYFLOAT key field increment
summary: Increment the float value of a hash field by the given amount
since: 2.6.0

HKEYS key
summary: Get all the fields in a hash
since: 2.0.0

HLEN key
summary: Get the number of fields in a hash
since: 2.0.0

HMGET key field [field ...]
summary: Get the values of all the given hash fields
since: 2.0.0

HMSET key field value [field value ...]
summary: Set multiple hash fields to multiple values
since: 2.0.0

HRANDFIELD key [count [WITHVALUES]]
summary: Get one or multiple random fields from a hash
since: 6.2.0

HSCAN key cursor [MATCH pattern] [COUNT count]
summary: Incrementally iterate hash fields and associated values
since: 2.8.0

HSET key field value [field value ...]
summary: Set the string value of a hash field
since: 2.0.0

HSETNX key field value
summary: Set the value of a hash field, only if the field does not exist
since: 2.0.0

HSTRLEN key field
summary: Get the length of the value of a hash field
since: 3.2.0

HVALS key
summary: Get all the values in a hash
since: 2.0.0

可对fields数值计算

Set

SADD key member [member ...]
summary: Add one or more members to a set
since: 1.0.0

SCARD key
summary: Get the number of members in a set
since: 1.0.0

SDIFF key [key ...]
summary: Subtract multiple sets
since: 1.0.0

SDIFFSTORE destination key [key ...]
summary: Subtract multiple sets and store the resulting set in a key
since: 1.0.0

SINTER key [key ...]
summary: Intersect multiple sets
since: 1.0.0

SINTERSTORE destination key [key ...]
summary: Intersect multiple sets and store the resulting set in a key
since: 1.0.0

SISMEMBER key member
summary: Determine if a given value is a member of a set
since: 1.0.0

SMEMBERS key
summary: Get all the members in a set
since: 1.0.0

SMISMEMBER key member [member ...]
summary: Returns the membership associated with the given elements for a set
since: 6.2.0

SMOVE source destination member
summary: Move a member from one set to another
since: 1.0.0

SPOP key [count]
summary: Remove and return one or multiple random members from a set
since: 1.0.0

SRANDMEMBER key [count]
summary: Get one or multiple random members from a set
since: 1.0.0

SREM key member [member ...]
summary: Remove one or more members from a set
since: 1.0.0

SSCAN key cursor [MATCH pattern] [COUNT count]
summary: Incrementally iterate Set elements
since: 2.8.0

SUNION key [key ...]
summary: Add multiple sets
since: 1.0.0

SUNIONSTORE destination key [key ...]
summary: Add multiple sets and store the resulting set in a key
since: 1.0.0

Sorted Set

BZPOPMAX key [key ...] timeout
summary: Remove and return the member with the highest score from one or more sorted sets, or block until one is available
since: 5.0.0

BZPOPMIN key [key ...] timeout
summary: Remove and return the member with the lowest score from one or more sorted sets, or block until one is available
since: 5.0.0

ZADD key [NX|XX] [GT|LT] [CH] [INCR] score member [score member ...]
summary: Add one or more members to a sorted set, or update its score if it already exists
since: 1.2.0

ZCARD key
summary: Get the number of members in a sorted set
since: 1.2.0

ZCOUNT key min max
summary: Count the members in a sorted set with scores within the given values
since: 2.0.0

ZDIFF numkeys key [key ...] [WITHSCORES]
summary: Subtract multiple sorted sets
since: 6.2.0

ZDIFFSTORE destination numkeys key [key ...]
summary: Subtract multiple sorted sets and store the resulting sorted set in a new key
since: 6.2.0

ZINCRBY key increment member
summary: Increment the score of a member in a sorted set
since: 1.2.0

ZINTER numkeys key [key ...] [WEIGHTS weight] [AGGREGATE SUM|MIN|MAX] [WITHSCORES]
summary: Intersect multiple sorted sets
since: 6.2.0

ZINTERSTORE destination numkeys key [key ...] [WEIGHTS weight] [AGGREGATE SUM|MIN|MAX]
summary: Intersect multiple sorted sets and store the resulting sorted set in a new key
since: 2.0.0

ZLEXCOUNT key min max
summary: Count the number of members in a sorted set between a given lexicographical range
since: 2.8.9

ZMSCORE key member [member ...]
summary: Get the score associated with the given members in a sorted set
since: 6.2.0

ZPOPMAX key [count]
summary: Remove and return members with the highest scores in a sorted set
since: 5.0.0

ZPOPMIN key [count]
summary: Remove and return members with the lowest scores in a sorted set
since: 5.0.0

ZRANDMEMBER key [count [WITHSCORES]]
summary: Get one or multiple random elements from a sorted set
since: 6.2.0

ZRANGE key min max [BYSCORE|BYLEX] [REV] [LIMIT offset count] [WITHSCORES]
summary: Return a range of members in a sorted set
since: 1.2.0

ZRANGEBYLEX key min max [LIMIT offset count]
summary: Return a range of members in a sorted set, by lexicographical range
since: 2.8.9

ZRANGEBYSCORE key min max [WITHSCORES] [LIMIT offset count]
summary: Return a range of members in a sorted set, by score
since: 1.0.5

ZRANGESTORE dst src min max [BYSCORE|BYLEX] [REV] [LIMIT offset count]
summary: Store a range of members from sorted set into another key
since: 6.2.0

ZRANK key member
summary: Determine the index of a member in a sorted set
since: 2.0.0

ZREM key member [member ...]
summary: Remove one or more members from a sorted set
since: 1.2.0

ZREMRANGEBYLEX key min max
summary: Remove all members in a sorted set between the given lexicographical range
since: 2.8.9

ZREMRANGEBYRANK key start stop
summary: Remove all members in a sorted set within the given indexes
since: 2.0.0

ZREMRANGEBYSCORE key min max
summary: Remove all members in a sorted set within the given scores
since: 1.2.0

ZREVRANGE key start stop [WITHSCORES]
summary: Return a range of members in a sorted set, by index, with scores ordered from high to low
since: 1.2.0

ZREVRANGEBYLEX key max min [LIMIT offset count]
summary: Return a range of members in a sorted set, by lexicographical range, ordered from higher to lower strings.
since: 2.8.9

ZREVRANGEBYSCORE key max min [WITHSCORES] [LIMIT offset count]
summary: Return a range of members in a sorted set, by score, with scores ordered from high to low
since: 2.2.0

ZREVRANK key member
summary: Determine the index of a member in a sorted set, with scores ordered from high to low
since: 2.0.0

ZSCAN key cursor [MATCH pattern] [COUNT count]
summary: Incrementally iterate sorted sets elements and associated scores
since: 2.8.0

ZSCORE key member
summary: Get the score associated with the given member in a sorted set
since: 1.2.0

ZUNION numkeys key [key ...] [WEIGHTS weight] [AGGREGATE SUM|MIN|MAX] [WITHSCORES]
summary: Add multiple sorted sets
since: 6.2.0

ZUNIONSTORE destination numkeys key [key ...] [WEIGHTS weight] [AGGREGATE SUM|MIN|MAX]
summary: Add multiple sorted sets and store the resulting sorted set in a new key
since: 2.0.0

物理内存是左小右大的摆放

存储结构：skip list