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Redis 字符串(String)介绍以及操作

2017-09-19 21:11 483 查看
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 test
OK
redis 127.0.0.1:6379> get myKey
"test"
redis 127.0.0.1:6379> del myKey
(integer) 1
redis 127.0.0.1:6379> get myKey
(nil)
--增减操作
redis 127.0.0.1:6379> set test-key 25
OK
redis 127.0.0.1:6379> get test-key
"25"
redis 127.0.0.1:6379> incr test-key
(integer) 26
redis 127.0.0.1:6379> decr test-key
(integer) 25
redis 127.0.0.1:6379> incrby test-key 666
(integer) 691
redis 127.0.0.1:6379> decrby test-key 690
(integer) 1
redis 127.0.0.1:6379> set test-key-float 25.0
OK
redis 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) 3
redis 127.0.0.1:6379> get test-key
"555"
redis 127.0.0.1:6379> setrange test-key 0 HH
(integer) 3
redis 127.0.0.1:6379> get test-key
"HH5"
redis 127.0.0.1:6379> set test-key helloworld
OK
redis 127.0.0.1:6379> setrange test-key 2 L
(integer) 10
redis 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' command
redis 127.0.0.1:6379> append test-key this is a append sentence
(error) ERR wrong number of arguments for 'append' command
redis 127.0.0.1:6379> append test-key  6
(integer) 11
redis 127.0.0.1:6379> get test-key
"heLloworld6"
redis 127.0.0.1:6379> set bit-key 5
OK
redis 127.0.0.1:6379> getbit bit-key
(error) ERR wrong number of arguments for 'getbit' command
redis 127.0.0.1:6379> getbit bit-key 2
(integer) 1
redis 127.0.0.1:6379> getbit bit-key 3
(integer) 1
redis 127.0.0.1:6379> getbit bit-key 0
(integer) 0
redis 127.0.0.1:6379> setbit bit-key 0 1
(integer) 0
redis 127.0.0.1:6379> get bit-key
"\xb5"
redis 127.0.0.1:6379>
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