Redis Note6:Redis-Key—List

1. List

1.1 插入：LPUSH 、RPUSH

# 添加值将一个值或多个值插入头部（左）
127.0.0.1:6379[3]> LPUSH list one
(integer) 1
127.0.0.1:6379[3]> LPUSH list two
(integer) 2
127.0.0.1:6379[3]> LPUSH list three
(integer) 3
# 获取所有值
127.0.0.1:6379[3]> LRANGE list 0 -1
1) "three"
2) "two"
3) "one"
# 获取值，倒叙获取
127.0.0.1:6379[3]> LRANGE list 0 1
1) "three"
2) "two"

# 添加值将一个值或多个值插入尾部（右）
127.0.0.1:6379[3]> RPUSH list zero
(integer) 4
127.0.0.1:6379[3]> LRANGE list 0 -1
1) "three"
2) "two"
3) "one"
4) "zero"

1.2 移除：lpop 、rpop

# 移除list第一个
127.0.0.1:6379[3]> lpop list
"three"
# 移除list最后一个
127.0.0.1:6379[3]> rpop list
"zero"
127.0.0.1:6379[3]> LRANGE list 0 -1
1) "two"
2) "one"

1.3 获取下表值：lindex

127.0.0.1:6379[3]> lindex list 0
"two"

1.4 返回列表的长度：llen

127.0.0.1:6379[3]> llen list
(integer) 2

1.5 移除指定个数的值：lrem

127.0.0.1:6379[3]> lrem list 1 one
(integer) 1

1.6 通过下标截取指定长度：LTRIM

127.0.0.1:6379[3]> LRANGE mylist 0 -1
1) "hello1"
2) "hello2"
3) "hello3"
127.0.0.1:6379[3]> LTRIM mylist 1 2
OK
127.0.0.1:6379[3]> LRANGE mylist 0 -1
1) "hello2"
2) "hello3"
127.0.0.1:6379[3]>

1.7 移除列表最后一个元素，移动到新的列表：RPOPLPUSH

127.0.0.1:6379[3]> LRANGE mylist 0 -1
1) "hello2"
2) "hello3"
3) "hello1"
127.0.0.1:6379[3]> RPOPLPUSH mylist mylist2
"hello1"
127.0.0.1:6379[3]> LRANGE mylist 0 -1
1) "hello2"
2) "hello3"
127.0.0.1:6379[3]> LRANGE mylist2 0 -1
1) "hello1"
127.0.0.1:6379[3]>

1.8 将列表指定下表的值替换为另一个值，更新操作：lset

# 判断列表是否存在
127.0.0.1:6379[3]> EXISTS list
(integer) 0
# 如果不存在列表，更新会报错
127.0.0.1:6379[3]> lset list 0 value0
(error) ERR no such key
127.0.0.1:6379[3]> lpush list value1
(integer) 1
# 如果存在，更新当前下表的值
127.0.0.1:6379[3]> LRANGE list 0 -1
1) "value1"
127.0.0.1:6379[3]> lset list 0 value2
OK
127.0.0.1:6379[3]> LRANGE list 0 -1
1) "value2"

1.9 在列表指定位置插入值：LINSERT

127.0.0.1:6379[3]> RPUSH list "hello"
(integer) 1
127.0.0.1:6379[3]> RPUSH list "world"
(integer) 2
127.0.0.1:6379[3]> LRANGE list 0 -1
1) "hello"
2) "world"
127.0.0.1:6379[3]> LINSERT list before "world" other
(integer) 3
127.0.0.1:6379[3]> LRANGE list 0 -1
1) "hello"
2) "other"
3) "world"
127.0.0.1:6379[3]> LINSERT list after "world" redis
(integer) 4
127.0.0.1:6379[3]> LRANGE list 0 -1
1) "hello"
2) "other"
3) "world"
4) "redis"

1.10