Redis list data type

List data type

List is a linked list structure, the main function is Push,pop, get all the values of a range and so on. In operation, key is understood as the name of the list, and the Redis list is actually a doubly linked list in which each child element is a string type, and we can add the deletion element from the head or tail of the list by Push,pop operation, so that the list can be both a stack and a queue

Lpush: Adding a string element to the list from the head

Example:

Lpush list1 ' Hello '

Lpush list1 ' World '

Lpush list1 ' ZJZ '

Lrange List1 0-2

Output: ZJZ World

Linsert insert at a specific location

Lpush List2 One

Lpush List2 Three

Linsert List2 before one outputs three-one head to front

LSet list2 0 ' AAA ' Replace the value of the element labeled 0 with AAA

Lrem List2 2 One removes two elements from the head, starting with the header (n<0 means delete from the tail, n=0 means delete all)

LTrim List2 1-1 retains elements of 1 to-1, all others removed

Lpop List2 pops an element from the head and returns the deleted element

Rpop List2 pops an element from the tail and returns the deleted element

Rpoplpush list1 list2 pop-up elements from List1 's tail and add to List2 's head

Lindex List1 1 Returns the value of the element labeled 1 in the List1, supporting negative numbers

Rpush list2 ' xxxx ' press in from the rear

Llen List2 Returns the length of the linked list

Redis list data type