Redis(2.8.3) 命令学习 - Lists

BLPOP key [key ...] timeout

Remove and get the first element in a list, or block until one is available

More: http://redis.io/commands/blpop, http://www.redis.cn/commands/blpop.html

BRPOP key [key ...] timeout

Remove and get the last element in a list, or block until one is available

More: http://redis.io/commands/brpop, http://www.redis.cn/commands/brpop.html

BRPOPLPUSH source destination timeout

Pop a value from a list, push it to another list and return it; or block until one is available

More: http://redis.io/commands/brpoplpush, http://www.redis.cn/commands/brpoplpush.html

LINDEX key index

Get an element from a list by its index

127.0.0.1:6379> LPUSH foo 1 3 5 7 9
(integer) 5
127.0.0.1:6379> LINDEX foo 1
"7"
127.0.0.1:6379> LINDEX foo -2
"3"

LINSERT key BEFORE|AFTER pivot value

Insert an element before or after another element in a list

127.0.0.1:6379> LPUSH foo 10 20 40 80
(integer) 4
127.0.0.1:6379> LINSERT foo BEFORE 20 80
(integer) 5
127.0.0.1:6379> LRANGE foo 0 -1
1) "80"
2) "40"
3) "80"
4) "20"
5) "10"
127.0.0.1:6379> LINSERT foo AFTER 80 0
(integer) 6
127.0.0.1:6379> LRANGE foo 0 -1
1) "80"
2) "0"
3) "40"
4) "80"
5) "20"
6) "10"

More: http://redis.io/commands/linsert, http://www.redis.cn/commands/linsert.html

LLEN key

Get the length of a list

127.0.0.1:6379> LPUSH foo 1 2 4
(integer) 3
127.0.0.1:6379> LLEN foo
(integer) 3

LPOP key

Remove and get the first element in a list

127.0.0.1:6379> LPUSH foo 1 2 4 8
(integer) 4
127.0.0.1:6379> LPOP foo
"8"
127.0.0.1:6379> LPOP foo
"4"

LPUSH key value [value ...]

Prepend one or multiple values to a list

127.0.0.1:6379> LPUSH foo 1
(integer) 1
127.0.0.1:6379> LPUSH foo 2 4
(integer) 3
127.0.0.1:6379> LRANGE foo -1 0
(empty list or set)
127.0.0.1:6379>
127.0.0.1:6379> LRANGE foo 0 -1
1) "4"
2) "2"
3) "1"

LPUSHX key value

Prepend a value to a list, only if the list exists

127.0.0.1:6379> LPUSHX foo 1
(integer) 0
127.0.0.1:6379> LRANGE foo 0 -1
(empty list or set)
127.0.0.1:6379> LPUSH foo 1
(integer) 1
127.0.0.1:6379> LPUSHX foo 2
(integer) 2
127.0.0.1:6379> LRANGE foo 0 -1
1) "2"
2) "1"

LRANGE key start stop

Get a range of elements from a list

127.0.0.1:6379> LPUSH foo 1 3 5 7 9
(integer) 5
127.0.0.1:6379> LRANGE foo 1 3
1) "7"
2) "5"
3) "3"
127.0.0.1:6379> LRANGE foo 0 -1
1) "9"
2) "7"
3) "5"
4) "3"
5) "1"

LREM key count value

Remove elements from a list

127.0.0.1:6379> RPUSH foo 1 2 1 3 1 4
(integer) 6
127.0.0.1:6379> LREM foo 2 1
(integer) 2
127.0.0.1:6379> LRANGE foo 0 -1
1) "2"
2) "3"
3) "1"
4) "4"
127.0.0.1:6379> RPUSH foo 3 1 3 2 1 3
(integer) 10
127.0.0.1:6379> LREM foo -3 3
(integer) 3
127.0.0.1:6379> LRANGE foo 0 -1
1) "2"
2) "3"
3) "1"
4) "4"
5) "1"
6) "2"
7) "1"
127.0.0.1:6379> LREM foo 0 1
(integer) 3
127.0.0.1:6379> LRANGE foo 0 -1
1) "2"
2) "3"
3) "4"
4) "2"

More: http://redis.io/commands/lrem, http://www.redis.cn/commands/lrem.html

LSET key index value

Set the value of an element in a list by its index

127.0.0.1:6379> RPUSH foo 1 2 3 4 5
(integer) 5
127.0.0.1:6379> LSET foo 3 0
OK
127.0.0.1:6379> LRANGE foo 0 -1
1) "1"
2) "2"
3) "3"
4) "0"
5) "5"

LTRIM key start stop

Trim a list to the specified range

127.0.0.1:6379> RPUSH foo 1 3 5 7 9
(integer) 5
127.0.0.1:6379> LTRIM foo 3 -1
OK
127.0.0.1:6379> LRANGE foo 0 -1
1) "7"
2) "9"

More: http://redis.io/commands/ltrim, http://www.redis.cn/commands/ltrim.html

RPOP key

Remove and get the last element in a list

127.0.0.1:6379> RPUSH foo 1 2 3 4
(integer) 4
127.0.0.1:6379> RPOP foo
"4"
127.0.0.1:6379> RPOP foo
"3"
127.0.0.1:6379> LRANGE foo 0 -1
1) "1"
2) "2"

RPOPLPUSH source destination

Remove the last element in a list, prepend it to another list and return it

127.0.0.1:6379> RPUSH foo 1 3 5
(integer) 3
127.0.0.1:6379> RPUSH bar 2 4
(integer) 2
127.0.0.1:6379> RPOPLPUSH foo bar
"5"
127.0.0.1:6379> LRANGE foo 0 -1
1) "1"
2) "3"
127.0.0.1:6379> LRANGE bar 0 -1
1) "5"
2) "2"
3) "4"
127.0.0.1:6379> RPOPLPUSH bar bar
"4"
127.0.0.1:6379> LRANGE bar 0 -1
1) "4"
2) "5"
3) "2"

More: http://redis.io/commands/rpoplpush, http://www.redis.cn/commands/rpoplpush.html

RPUSH key value [value ...]

Append one or multiple values to a list

127.0.0.1:6379> RPUSH foo 1
(integer) 1
127.0.0.1:6379> RPUSH foo 1 2 3
(integer) 4
127.0.0.1:6379> LRANGE foo 0 -1
1) "1"
2) "1"
3) "2"
4) "3"

RPUSHX key value

Append a value to a list, only if the list exists

127.0.0.1:6379> RPUSHX foo 1
(integer) 0
127.0.0.1:6379> LRANGE foo 0 -1
(empty list or set)
127.0.0.1:6379> RPUSH foo 1
(integer) 1
127.0.0.1:6379> RPUSHX foo 2
(integer) 2
127.0.0.1:6379> LRANGE foo 0 -1
1) "1"
2) "2"

时间： 2024-12-21 14:46:06

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