Redis 字符串(String)介绍以及操作

存储内容：字符串，整数，浮点数

命令 操作 set 存储给定键的值 get 获取给定键的值 del 删除给定键的值 incr 给键存储的值加1 decr 给键存储的值减1 incrby 给键存储的值加指定的大小 decrby 给键存储的值减去特定的大小 incrbyfloat 给键存储的值加指定的浮点数大小（Redis版本必须大于2.6） append 将值追加到给定键的末尾 setrange 将一个偏移量为start开始的设置为给定值 getrange 获取一个偏移量在start到end所有字符组成的子串 getbit 获取二进制的值 setbit 设置一个位串的二进制的值 bitcount 统计二进制位串里面值位1的数量，可以给定偏移量 bittop 统计二进制位串里面值位1的数量，可以给定偏移量

--基本增删改操作redis 127.0.0.1:6379> set myKey testOKredis 127.0.0.1:6379> get myKey"test"redis 127.0.0.1:6379> del myKey(integer) 1redis 127.0.0.1:6379> get myKey(nil)--增减操作redis 127.0.0.1:6379> set test-key 25OKredis 127.0.0.1:6379> get test-key"25"redis 127.0.0.1:6379> incr test-key(integer) 26redis 127.0.0.1:6379> decr test-key(integer) 25redis 127.0.0.1:6379> incrby test-key 666(integer) 691redis 127.0.0.1:6379> decrby test-key 690(integer) 1redis 127.0.0.1:6379> set test-key-float 25.0OKredis 127.0.0.1:6379> incrbyfloat test-key-float 54.54(error) ERR unknown command 'incrbyfloat'--其他操作redis 127.0.0.1:6379> get test-key"55"redis 127.0.0.1:6379> append test-key 5(integer) 3redis 127.0.0.1:6379> get test-key"555"redis 127.0.0.1:6379> setrange test-key 0 HH(integer) 3redis 127.0.0.1:6379> get test-key"HH5"redis 127.0.0.1:6379> set test-key helloworldOKredis 127.0.0.1:6379> setrange test-key 2 L(integer) 10redis 127.0.0.1:6379> get test-key"heLloworld"redis 127.0.0.1:6379> getrange test-key 0 3"heLl"redis 127.0.0.1:6379> append test-key this is a append sentence.(error) ERR wrong number of arguments for 'append' commandredis 127.0.0.1:6379> append test-key this is a append sentence(error) ERR wrong number of arguments for 'append' commandredis 127.0.0.1:6379> append test-key  6(integer) 11redis 127.0.0.1:6379> get test-key"heLloworld6"redis 127.0.0.1:6379> set bit-key 5OKredis 127.0.0.1:6379> getbit bit-key(error) ERR wrong number of arguments for 'getbit' commandredis 127.0.0.1:6379> getbit bit-key 2(integer) 1redis 127.0.0.1:6379> getbit bit-key 3(integer) 1redis 127.0.0.1:6379> getbit bit-key 0(integer) 0redis 127.0.0.1:6379> setbit bit-key 0 1(integer) 0redis 127.0.0.1:6379> get bit-key"\xb5"redis 127.0.0.1:6379>