Shulou(Shulou.com)06/01 Report--

List types and operations

List is a linked list structure, the main function is push, pop, get all the values in a range, etc., the key in the operation is understood as the name of the linked list. The list type of Redis is actually a doubly linked list with each child element of type String. We can add and delete elements from the head or tail of the list through push and pop operations, so that the list can be used as both a stack and a queue.

lpush

Add a string element to the head of the list corresponding to key

//press world then hello127.0.0.1:6379> lpush mylist world(integer) 1127.0.0.1:6379> lpush mylist hello(integer) 2lrange// 0 for the first element,-1 for the last element 127.0.0.1: 6379> lrange mylist 0 -11) "hello"2) "world" push

Add string data to the end of the list corresponding to key

127.0.0.1:6379> rpush mylist chenxl(integer) 3127.0.0.1:6379> lrange mylist 0 -11) "hello"2) "world"linsert

Add a string before or after a specific position in the list corresponding to key

127.0.0.1:6379> lpush countList one(integer) 1127.0.0.1:6379> lpush countList two(integer) 2127.0.0.1:6379> linsert countList before two three(integer) 3127.0.0.1:6379> lrange countList 0 -11) "three"2) "two"3) "one"lset

Sets the value of the element in the list for the specified index

//Change subscript 1, i.e. the second element, to 2.5127.0.0.1:6379> lset countList 1 2.5OK127.0.0.1:6379> lrange countList 0 -11) "three"2) "2.5"3) "one"lrem

Delete n elements identical to value from the list corresponding to key, n lrange countList 0 -11) "one"2) "one"3) "one"4) "three"5) "2.5"6) "one" 127.0.0.1: 6379> lrem countList 2 one(integer) 2127.0.0.1:6379> lrange countList 0 -11) "one"2) "three"3) "2.5"4) "one"ltrim

Retains data within the range of values specified by key

127.0.0.1:6379> lpush numList one(integer) 1127.0.0.1:6379> lpush numList two(integer) 2127.0.0.1:6379> lpush numList three(integer) 3127.0.0.1:6379> lpush numList four(integer) 4127.0.0.1:6379> lpush numList five(integer) 5127.0.0.1:6379> ltrim numList 1 3OK127.0.0.1:6379> lrange numList 0 -11) "four"2) "three"3) "two"lpop

Delete an element from the head of the list and return the deleted element

127.0.0.1:6379> lrange mylist 0 -11) "hello"2) "world"3) "chenxl"127.0.0.1:6379> lpop mylist "hello"127.0.0.1:6379> lrange mylist 0 -11) "world"2) "chenxl"rpop

Remove an element from the end of the list and return the deleted element

127.0.0.1:6379> rpush mylist one(integer) 1127.0.0.1:6379> rpush mylist two(integer) 2127.0.0.1:6379> rpush mylist three(integer) 3127.0.0.1:6379> lrange mylist 0 -11) "one"2) "two"3) "three"127.0.0.1:6379> rpop mylist "three"127.0.0.1:6379> rpop mylist "two"127.0.0.1:6379> lrange mylist 0 -11) "one"rpoplpush

Remove elements from the end of the first list and add them to the head of the second list

127.0.0.1:6379> lrange mylist01 0 -11) "one"2) "two"3) "three"127.0.0.1:6379> lrange mylist02 0 -11) "four"2) "five"3) "six"127.0.0.1:6379> rpoplpush mylist01 mylist02"three"127.0.0.1:6379> lrange mylist01 0 -11) "one"2) "two"127.0.0.1:6379> lrange mylist02 0 -11) "three"2) "four"3) "five"4) "six"lindex

Returns the element at index in a list named key

127.0.0.1:6379> lrange mylist 0 -11) "one"2) "two"3) "three"127.0.0.1:6379> lindex mylist 1"two"llen

Returns the length of the list corresponding to the key

127.0.0.1:6379> lrange mylist 0 -1 1) "one"2) "two"3) "three"127.0.0.1:6379> llen mylist(integer) 3

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