Redis數據類型 官網說明文檔：http://www.redis.io/topics/data-types-intro Redis keys Redis keys are binary safe, this means that you can use any binary sequence as ...
Redis數據類型
官網說明文檔：http://www.redis.io/topics/data-types-intro
Redis keys
Redis keys are binary safe, this means that you can use any binary sequence as a key, from a string like "foo" to the content of a JPEG file. The empty string is also a valid key.
Redis key是二進位安全的，這意味著你可以使用任何二進位序列作為一個key，從一個字元串”foo”到JPEG文件的內容。空字元串也是合法的key。
規則
- Key不要太長，消耗記憶體，在數據集中查找key可能會需要更多的匹配成本。
- Key不要太短，可讀性較差，
- 追尋一種模式"object-type:id" "comment:1234:reply.to" or "comment:1234:reply-to"
- Key允許的最大值為512M
Redis客戶端 Redis-Cli
查看幫助
redis-cli --help
指定數據塊編號
redis-cli -n 0
獲取命令的幫助信息
官網幫助文檔：http://www.redis.io/commands
help @string 獲取數據類型string的相關操作命令
help @list 獲取數據類型list的相關操作命令
help set
help <tab>鍵 有提示信息
String
這裡簡單介紹下String類型：
help @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 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 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] [NX|XX] 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 STRLEN key summary: Get the length of the value stored in a key since: 2.2.0
設置Key-value值
SET key value [EX seconds] [PX milliseconds] [NX|XX]
EX 過期時間，秒 等同於 SETEX key seconds value
PX 過期時間，毫秒 等同於 PSETEX key milliseconds value
NX 鍵不存在，才能設置 等同於 SETNX key value
XX 鍵存在時，才能設置
設置多個Key和value
MSET key value [key value ...]
MSETNX key value [key value ...] 鍵不存在時，才設置值
過期設置
設置多少秒或毫秒後過期
EXPIRE key seconds 秒
PEXPIRE key milliseconds 毫秒
設置在指定unix時間戳過期
EXPIREAT key timestamp 秒
PEXPIREAT key milliseconds-timestamp 毫秒
PERSIST key 刪除過期的key
查看剩餘時間
TTL key
PTTL key
-1 沒有設置TTL
-2找有找到key
查找key
KEYS pattern
*任意長度字元
？任意一個字元
[]字元集合
增量計數
INCR key
例子：
set counter 100
INCR counter
101
INCRBY key increment 根據給定的值進行增量計數
DECR key
DECRBY key increment
