Redis笔记06：五大数据类型-List

List

在redis中 list可做为栈 队列 阻塞队列

基础

127.0.0.1:6379> lpush list one  		#将一个值或者多个值插入列表头部（左）
(integer) 1
127.0.0.1:6379> lpush list two
(integer) 2
127.0.0.1:6379> lpush list three
(integer) 3
127.0.0.1:6379> lrange list 0 -1   #获取list中的值
1) "three"
2) "two"
3) "one"
127.0.0.1:6379> lrange list 0 1		#获取指定的值
1) "three"
2) "two"

127.0.0.1:6379> rpush list four		#将一个值或者多个值插入列表尾部（右）
(integer) 4
127.0.0.1:6379> lrange list 0 -1
1) "three"
2) "two"
3) "one"
4) "four"

lpop rpop

127.0.0.1:6379> lrange list 0 -1		
1) "three"
2) "two"
3) "one"
4) "four"
127.0.0.1:6379> lpop list		#移除列表的第一个元素
"three"
127.0.0.1:6379> lrange list 0 -1
1) "two"
2) "one"
3) "four"
127.0.0.1:6379> rpop list		#移除列表的最后一个元素
"four"
127.0.0.1:6379> lrange list 0 -1
1) "two"
2) "one"

Lindex

127.0.0.1:6379> lindex list 1		#根据下标，获取指定值
"one"
127.0.0.1:6379> lindex list 0
"two"

Llen

127.0.0.1:6379> lrange list 0 -1
1) "two"
2) "one"
127.0.0.1:6379> llen list         #获取列表长度
(integer) 2

Lrem 移除指定值

127.0.0.1:6379> lrange list 0 -1
1) "five"
2) "two"
3) "one"
4) "two"
5) "one"
127.0.0.1:6379> lrem list 1 one        #移除list中指定个数的value精确匹配
(integer) 1
127.0.0.1:6379> lrange list 0 -1
1) "five"
2) "two"
3) "two"
4) "one"
127.0.0.1:6379> lrem list 2 two
(integer) 2
127.0.0.1:6379> lrange list 0 -1
1) "five"
2) "one"

Ltrim 修剪list list被改变

127.0.0.1:6379> lrange list 0 -1
1) "555"
2) "444"
3) "333"
4) "222"
5) "111"
127.0.0.1:6379> ltrim list 1 2  #通过下标截取指定长度
OK
127.0.0.1:6379> lrange list 0 -1
1) "444"
2) "333"

Rpoplpush //将前一个列表中的最后一个元素移动到后一个列表中（后一个列表没有自动创建）

127.0.0.1:6379> lrange list 0 -1
1) "666"
2) "555"
3) "444"
4) "333"
127.0.0.1:6379> rpoplpush list newlist
"333"
127.0.0.1:6379> lrange list 0 -1
1) "666"
2) "555"
3) "444"
127.0.0.1:6379> lrange newlist 0 -1
1) "333"

Lset 修改指定下标的值

127.0.0.1:6379> lrange list 0 -1
1) "222"
2) "111"
127.0.0.1:6379> lset list 0 333
OK
127.0.0.1:6379> lrange list 0 -1
1) "333"
2) "111"

Linsert 插入值

127.0.0.1:6379> lrange list 0 -1
1) "hello"
2) "world"
127.0.0.1:6379> linsert list before world new     #在world之前插入new
(integer) 3
127.0.0.1:6379> lrange list 0 -1
1) "hello"
2) "new"
3) "world"
127.0.0.1:6379> linsert list after world wwwwqx    #在world之后插入wwwwqx
(integer) 4
127.0.0.1:6379> lrange list 0 -1
1) "hello"
2) "new"
3) "world"
4) "wwwwqx"