redis list指令操作

1.将值追加到清單

rpush key value [value ...]

summary: append one or multiple values to a list

since: 1.0.0

127.0.0.1:6379> rpush mylist value1 value2 value3

(integer) 3

2.擷取清單的長度

llen key

summary: get the length of a list

127.0.0.1:6379> llen mylist

3.擷取并移除清單中第一個元素

blpop key [key ...] timeout

summary: remove and get the first element in a list, or block until one is available

since: 2.0.0

127.0.0.1:6379> blpop mylist 3

1) "mylist" ##清單key

2) "value1" #清單目前第一個值

1) "mylist"

2) "value2"

2) "value3"

127.0.0.1:6379> blpop mylist 3 清單已經不存在value

(nil)

(3.78s)

4.擷取并移除清單中的最後一個元素

brpop key [key ...] timeout

summary: remove and get the last element in a list, or block until one is available

127.0.0.1:6379> brpop list1 3

1) "list1" #清單鍵名

2) "value3" #清單最後一個值

5.出棧list中的一個value，并放入另一個list中，并傳回該值

brpoplpush source destination timeout

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

since: 2.2.0

127.0.0.1:6379> brpoplpush list1 list2 3

"value2"

6.擷取指定位置的value值，傳回的是該位置的值，無值或超出邊界傳回nil

lindex key index

summary: get an element from a list by its index

7.在清單一個元素的之前或之後插入一個元素，傳回目前清單的長度

linsert key before|after pivot value

summary: insert an element before or after another element in a list

127.0.0.1:6379> linsert ml before v2 value2

(integer) 5  在v2之前插入值value2

8.棧頂元素出棧

lpop key

summary: remove and get the first element in a list

127.0.0.1:6379> lpop ml

"v1"

9.向list中添加一個或多個value，後加入的值，index在前(将元素壓入棧頂)

lpush key value [value ...]

summary: prepend one or multiple values to a list

127.0.0.1:6379> lpush list2 val1 val2 val3 val4 val5

(integer) 6

127.0.0.1:6379> lindex list2 0

"val5"

10.隻有當清單存在時，才從棧頂壓入元素

lpushx key value

summary: prepend a value to a list, only if the list exists

11.擷取指定範圍的list的value值

lrange key start stop

summary: get a range of elements from a list

12.從清單中移除元素(當list中存在多個重複的值時，count确定要移除幾個value)

lrem key count value

summary: remove elements from a list

13.通過元素的索引index設定value

lset key index value

summary: set the value of an element in a list by its index

127.0.0.1:6379> lset list2 3 namew #修改第三個位置的值

ok

14. 

ltrim key start stop

summary: trim a list to the specified range

15.移除并擷取清單中的最後一個元素

rpop key

summary: remove and get the last element in a list

16.移除清單中的最後一個元素，追加到另一個清單中，并傳回該值

rpoplpush source destination

summary: remove the last element in a list, append it to another list and return it

since: 1.2.0

17.将值追加到清單中，隻有當這個清單已經存在

rpushx key value

summary: append a value to a list, only if the list exists