Redis 資料類型

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Redis資料類型

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，從一個字串”foo”到JPEG檔案的內容。Null 字元串也是合法的key。

 

規則

• Key不要太長，消耗記憶體，在資料集中尋找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用戶端 Redis-Cli

查看協助

redis-cli  --help

指定資料區塊編號

redis-cli -n 0

 

擷取命令的協助資訊

官網協助文檔：http://www.redis.io/commands

help @string  擷取資料類型string的相關操作命令

help @list 擷取資料類型list的相關操作命令

help set

help <tab>鍵 有提示資訊

 

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

 

設定Key-value值

SET key value [EX seconds] [PX milliseconds] [NX|XX]

EX  到期時間，秒  等同於 SETEX key seconds value

PX  到期時間，毫秒  等同於 PSETEX key milliseconds value

NX  鍵不存在，才能設定  等同於 SETNX key value

XX  鍵存在時，才能設定

 

設定多個Key和value

MSET key value [key value ...]MSETNX key value [key value ...]   鍵不存在時，才設定值

 

到期設定

設定多少秒或毫秒後到期

EXPIRE key seconds    秒PEXPIRE key milliseconds  毫秒

 

設定在指定unix時間戳記到期

EXPIREAT key timestamp     秒PEXPIREAT key milliseconds-timestamp    毫秒

PERSIST key  刪除到期的key

 

查看剩餘時間

TTL keyPTTL key

-1 沒有設定TTL

-2找有找到key

 

尋找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 keyDECRBY key increment 

 

Redis 資料類型