3、链表

3、链表

• lpush key value:在key左端插入值

• rpush key value

• lpushx key value:key不存在时，不插入

• rpushx key value

• rpop key:删除链表尾部的值

• lrange key start stop：返回链表[start , stop]的数值

• lrem key count value：删除key中的value值

  • count表示只删除count个
  • count<0表示从表尾删除
  • count>0表示从表头开始

• ltrim key start stop：将key的值设为[start , stop]间的值

  127.0.0.1:6379> lrange a 0 -1
  1) "5"
  2) "4"
  3) "3"
  4) "2"
  5) "2"
  6) "1"
  127.0.0.1:6379> ltrim a 1 3
  OK
  127.0.0.1:6379> lrange a 0 -1
  1) "4"
  2) "3"
  3) "2"
  

• lindex key index:返回index上的值

• llen key: 返回key的长度

• linsert key after|before search value：在search前或者后插入value

  127.0.0.1:6379> linsert a before 1 7
  (integer) -1    -->不存在时报错
  127.0.0.1:6379> lrange a 0 -1
  1) "4"
  2) "3"
  3) "2"
  127.0.0.1:6379> linsert a before 2 5
  (integer) 4
  127.0.0.1:6379> lrange a 0 -1
  1) "4"
  2) "3"
  3) "5"
  4) "2"
  
  127.0.0.1:6379> lrange a 0 -1
  1) "2"
  2) "4"
  3) "3"
  4) "5"
  5) "2"
  127.0.0.1:6379> linsert a before 2 9
  (integer) 6
  127.0.0.1:6379> lrange a 0 -1
  1) "9"          -->从表头开始查找，只匹配一个
  2) "2"
  3) "4"
  4) "3"
  5) "5"
  6) "2"
  

• rpoplpush source dest：把source的表尾取出并放置到dest的表头：

  127.0.0.1:6379> lrange a 0 -1
  1) "9"
  2) "2"
  3) "4"
  4) "3"
  5) "5"
  6) "2"
  127.0.0.1:6379> rpoplpush a b
  "2"
  127.0.0.1:6379> lrange b 0 -1
  1) "2"
  127.0.0.1:6379> lrange a 0 -1
  1) "9"
  2) "2"
  3) "4"
  4) "3"
  5) "5"
  

• brpop | blpop key [key…] timeout：等待弹出key的表尾或者表头，timeout为等待时间

  127.0.0.1:6379> lrange a 0 -1
  1) "9"
  2) "2"
  3) "4"
  4) "3"
  5) "5"
  127.0.0.1:6379> brpop a 2
  1) "a"
  2) "5"
  127.0.0.1:6379> lrange a 0 -1
  1) "9"
  2) "2"
  3) "4"
  4) "3"
  

来源：CSDN

作者：clchenLOu

链接：https://blog.csdn.net/weixin_40632135/article/details/104319689