Redis 命令 - Strings
APPEND key value
Available since 2.0.0, Time complexity: O(1).
Append a value to a key
127.0.0.1:6379> SET foo hello
OK
127.0.0.1:6379> APPEND foo world
(integer) 10
127.0.0.1:6379> GET foo
"helloworld"
127.0.0.1:6379> APPEND bar hello
(integer) 5
127.0.0.1:6379> GET bar
"hello"
More: http://redis.io/commands/append, http://www.redis.cn/commands/append.html
BITCOUNT key [start end]
Count set bits in a string
127.0.0.1:6379> SET foo hello
OK
127.0.0.1:6379> BITCOUNT foo
(integer) 21
More: http://redis.io/commands/bitcount, http://www.redis.cn/commands/bitcount.html
BITOP operation destkey key [key ...]
Perform bitwise operations between strings
127.0.0.1:6379> SET key1 aba
OK
127.0.0.1:6379> SET key2 abb
OK
127.0.0.1:6379> BITOP OR dest key1 key2
(integer) 3
127.0.0.1:6379> GET dest
"abc"
More: http://redis.io/commands/bitop, http://www.redis.cn/commands/bitop.html
BITPOS key bit [start] [end]
Find first bit set or clear in a string
127.0.0.1:6379> SET foo "\xff\xf0\x00"
OK
127.0.0.1:6379> BITPOS foo 0
(integer) 12
127.0.0.1:6379> SET foo "\x00\xff\xf0"
OK
127.0.0.1:6379> BITPOS foo 1
(integer) 8
More: http://redis.io/commands/bitpos
DECR key
Decrement the integer value of a key by one
127.0.0.1:6379> SET foo 10
OK
127.0.0.1:6379> DECR foo
(integer) 9
127.0.0.1:6379> DECR foo
(integer) 8
127.0.0.1:6379> DECR bar
(integer) -1
More: http://redis.io/commands/decr, http://www.redis.cn/commands/decr.html
DECRBY key decrement
Decrement the integer value of a key by the given number
127.0.0.1:6379> SET foo 10
OK
127.0.0.1:6379> DECRBY foo 3
(integer) 7
127.0.0.1:6379> DECRBY foo 4
(integer) 3
More: http://redis.io/commands/decrby, http://www.redis.cn/commands/decrby.html
GET key
Get the value of a key
127.0.0.1:6379> GET foo
(nil)
127.0.0.1:6379> SET foo hello
OK
127.0.0.1:6379> GET foo
"hello"
More: http://redis.io/commands/get, http://www.redis.cn/commands/get.html
GETBIT key offset
Returns the bit value at offset in the string value stored at key
# binary of code a's ASCII is 01100001
127.0.0.1:6379> SET foo a
OK
127.0.0.1:6379> GETBIT foo 0
(integer) 0
127.0.0.1:6379> GETBIT foo 1
(integer) 1
127.0.0.1:6379> GETBIT foo 2
(integer) 1
127.0.0.1:6379> GETBIT foo 3
(integer) 0
127.0.0.1:6379> GETBIT foo 4
(integer) 0
127.0.0.1:6379> GETBIT foo 5
(integer) 0
127.0.0.1:6379> GETBIT foo 6
(integer) 0
127.0.0.1:6379> GETBIT foo 7
(integer) 1
More: http://redis.io/commands/getbit, http://www.redis.cn/commands/getbit.html
GETRANGE key start end
Get a substring of the string stored at a key
127.0.0.1:6379> SET foo helloworld
OK
127.0.0.1:6379> GETRANGE foo 0 3
"hell"
127.0.0.1:6379> GETRANGE foo 3 5
"low"
127.0.0.1:6379> GETRANGE foo 5 -1
"world"
More: http://redis.io/commands/getrange, http://www.redis.cn/commands/getrange.html
GETSET key value
Set the string value of a key and return its old value
127.0.0.1:6379> SET foo hello
OK
127.0.0.1:6379> GETSET foo world
"hello"
127.0.0.1:6379> GET foo
"world"
More: http://redis.io/commands/getset, http://www.redis.cn/commands/getset.html
INCR key
Increment the integer value of a key by one
127.0.0.1:6379> SET foo 10
OK
127.0.0.1:6379> INCR foo
(integer) 11
127.0.0.1:6379> INCR foo
(integer) 12
127.0.0.1:6379> INCR bar
(integer) 1
More: http://redis.io/commands/incr, http://www.redis.cn/commands/incr.html
INCRBY key increment
Increment the integer value of a key by the given amount
127.0.0.1:6379> SET foo 10
OK
127.0.0.1:6379> INCRBY foo 2
(integer) 12
127.0.0.1:6379> INCRBY foo 3
(integer) 15
127.0.0.1:6379> INCRBY bar 4
(integer) 4
More: http://redis.io/commands/incrby, http://www.redis.cn/commands/incrby.html
INCRBYFLOAT key increment
Increment the float value of a key by the given amount
127.0.0.1:6379> SET foo 10
OK
127.0.0.1:6379> INCRBYFLOAT foo 2.3
"12.3"
127.0.0.1:6379> INCRBYFLOAT foo 5.8E2
"592.29999999999999999"
127.0.0.1:6379>
127.0.0.1:6379> INCRBYFLOAT bar 3.33
"3.33"
More: http://redis.io/commands/incrbyfloat, http://www.redis.cn/commands/incrbyfloat.html
MGET key [key ...]
Get the values of all the given keys
127.0.0.1:6379> SET foo hello
OK
127.0.0.1:6379> SET bar world
OK
127.0.0.1:6379> MGET foo bar
1) "hello"
2) "world"
More: http://redis.io/commands/mget, http://www.redis.cn/commands/mget.html
MSET key value [key value ...]
Set multiple keys to multiple values
127.0.0.1:6379> MSET foo hello bar world
OK
127.0.0.1:6379> MGET foo bar
1) "hello"
2) "world"
More: http://redis.io/commands/mset, http://www.redis.cn/commands/mset.html
MSETNX key value [key value ...]
Set multiple keys to multiple values, only if none of the keys exist
127.0.0.1:6379> SET foo hello
OK
127.0.0.1:6379> MSETNX foo world bar world
(integer) 0
127.0.0.1:6379> MGET foo bar
1) "hello"
2) (nil)
More: http://redis.io/commands/msetnx, http://www.redis.cn/commands/msetnx.html
PSETEX key milliseconds value
Set the value and expiration in milliseconds of a key
127.0.0.1:6379> PSETEX foo 10000 hello
OK
127.0.0.1:6379> PTTL foo
(integer) 8404
127.0.0.1:6379> GET foo
"hello"
127.0.0.1:6379> PTTL foo
(integer) -2
127.0.0.1:6379> GET foo
(nil)
More: http://redis.io/commands/psetex, http://www.redis.cn/commands/psetex.html
SET key value [EX seconds] [PX milliseconds] [NX|XX]
Set the string value of a key
127.0.0.1:6379> SET foo hello
OK
127.0.0.1:6379> GET foo
"hello"
More: http://redis.io/commands/set, http://www.redis.cn/commands/set.html
SETBIT key offset value
Sets or clears the bit at offset in the string value stored at key
127.0.0.1:6379> SET foo a
OK
127.0.0.1:6379> GETBIT foo 7
(integer) 1
127.0.0.1:6379> SETBIT foo 7 0
(integer) 1
More: http://redis.io/commands/setbit, http://www.redis.cn/commands/setbit.html
SETEX key seconds value
Set the value and expiration of a key
127.0.0.1:6379> SETEX foo 10 hello
OK
127.0.0.1:6379> TTL foo
(integer) 8
127.0.0.1:6379> GET foo
"hello"
127.0.0.1:6379> TTL foo
(integer) -2
127.0.0.1:6379> GET foo
(nil)
More: http://redis.io/commands/setex, http://www.redis.cn/commands/setex.html
SETNX key value
Set the value of a key, only if the key does not exist
127.0.0.1:6379> SETNX foo hello
(integer) 1
127.0.0.1:6379> GET foo
"hello"
127.0.0.1:6379> SETNX foo world
(integer) 0
127.0.0.1:6379> GET foo
"hello"
More: http://redis.io/commands/setnx, http://www.redis.cn/commands/msetnx.html
SETRANGE key offset value
Overwrite part of a string at key starting at the specified offset
127.0.0.1:6379> SET foo helloworld
OK
127.0.0.1:6379> SETRANGE foo 5 redis
(integer) 10
127.0.0.1:6379> GET foo
"helloredis"
More: http://redis.io/commands/setrange, http://www.redis.cn/commands/setrange.html
STRLEN key
Get the length of the value stored in a key
127.0.0.1:6379> set foo hello
OK
127.0.0.1:6379> STRLEN foo
(integer) 5
More: http://redis.io/commands/strlen, http://www.redis.cn/commands/strlen.html
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