redis string 命令

redis String 命令汇总：

在redis控制台中可以使用help @String 命名查看redis关于String提供的相关命令，并且描述的相当清晰，下边是我使用该命令查询的结果：

  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  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