string 组
概述
参考：
APPEND - 附加一个 value 到指定的 key
since: 2.0.0
Syntax(语法)
APPEND key value
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 - 获取指定 key 的 value
since: 1.0.0
Syntax(语法)
GET key
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 - 设置指定 key 的 字符串类型的 value
SET key value [EX seconds] [PX milliseconds] [NX|XX]
since: 1.0.0
如果 key 已经保存了一个值，那么这个操作会直接覆盖原来的值，并且忽略原始类型。当 set 命令执行成功之后，之前设置的过期时间都将失效。
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
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