List type and operation of Redis
Lpush: add a string element to the header of the list corresponding to key.
127.0.0.1 purl 6379 > lpush mylist world
(integer) 1
127.0.0.1 purl 6379 > lpush mylist hello
(integer) 2
127.0.0.1 lrange mylist 6379 > 0-1
1) "hello"
2) "world"
Rpush: add a string element to the end of the list corresponding to key.
127.0.0.1 purl 6379 > rpush mylist2 world
(integer) 1
127.0.0.1 purl 6379 > rpush mylist2 hello
(integer) 2
127.0.0.1 lrange mylist2 6379 > 0-1
1) "world"
2) "hello"
Linsert: add a string before or after the specific position of the list corresponding to the key.
127.0.0.1 purl 6379 > rpush mylist3 world
(integer) 1
127.0.0.1 purl 6379 > linsert mylist3 before world hello
(integer) 2
127.0.0.1 lrange mylist3 6379 > 0-1
1) "hello"
2) "world"
Lset: sets the element value of the specified subscript in the list.
127.0.0.1 purl 6379 > rpush mylist4 hello
(integer) 1
127.0.0.1 lrange mylist4 6379 > 0-1
1) "hello"
127.0.0.1 6379 > lset mylist4 0 world
OK
127.0.0.1 lrange mylist4 6379 > 0-1
1) "world"
Lrem: delete n elements that are the same as value from the corresponding list of key. (n rpush mylist5 hello
(integer) 1
127.0.0.1 purl 6379 > rpush mylist5 hello
(integer) 2
127.0.0.1 purl 6379 > rpush mylist5 hello
(integer) 3
127.0.0.1 lrange mylist5 6379 > 0-1
1) "hello"
2) "hello"
3) "hello"
127.0.0.1 6379 > lrem mylist5 1 hello
(integer) 1
127.0.0.1 lrange mylist5 6379 > 0-1
1) "hello"
2) "hello"
127.0.0.1 6379 > lrem mylist5 2 hello
(integer) 2
127.0.0.1 lrange mylist5 6379 > 0-1
(empty list or set)
Ltrim: retains data within the value range of the specified key.
127.0.0.1 purl 6379 > rpush mylist6 one
(integer) 1
127.0.0.1 purl 6379 > rpush mylist6 two
(integer) 2
127.0.0.1 purl 6379 > rpush mylist6 three
(integer) 3
127.0.0.1 lrange mylist6 6379 > 0-1
1) "one"
2) "two"
3) "three"
127.0.0.1 ltrim mylist6 6379 > 1-1
OK
127.0.0.1 lrange mylist6 6379 > 0-1
1) "two"
2) "three"
Lpop: deletes the element from the header of the list and returns the deleted element.
127.0.0.1 lrange mylist6 6379 > 0-1
1) "two"
2) "three"
127.0.0.1 purl 6379 > lpop mylist6
"two"
127.0.0.1 lrange mylist6 6379 > 0-1
1) "three"
Rpop: removes the element from the tail of the list and returns the deleted element.
127.0.0.1 purl 6379 > lpush mylist6 tow
(integer) 2
127.0.0.1 lrange mylist6 6379 > 0-1
1) "tow"
2) "three"
127.0.0.1 purl 6379 > rpop mylist6
"three"
127.0.0.1 lrange mylist6 6379 > 0-1
1) "tow"
Rpoplpush: removes the element from the tail of the first list and adds it to the header of the second list.
127.0.0.1 lrange mylist6 6379 > 0-1
1) "tow"
127.0.0.1 lrange mylist5 6379 > 0-1
1) "two"
127.0.0.1 lrange mylist6 6379 > 0-1
1) "tow"
127.0.0.1 purl 6379 > rpoplpush mylist5 mylist6
"two"
127.0.0.1 lrange mylist5 6379 > 0-1
(empty list or set)
127.0.0.1 lrange mylist6 6379 > 0-1
1) "two"
2) "tow"
Lindex: returns the element of index location in the list with the name key.
127.0.0.1 lrange mylist6 6379 > 0-1
1) "two"
2) "tow"
127.0.0.1 lindex mylist6 6379 > 0
"two"
127.0.0.1 lindex mylist6 6379 > 1
"tow
