Redis数据类型－List

lpush
在对应的list头部添加元素
127.0.0.1:6379> lpush mylist value1
(integer) 1
127.0.0.1:6379> lpush mylist value2
(integer) 2
打印出来看一下
127.0.0.1:6379> lrange mylist 0 -1

1) "value2"

2) "value1"

rpush
在对应list尾部添加元素
在下面的基础上做以下操作
127.0.0.1:6379> rpush mylist value3

(integer) 3

127.0.0.1:6379> lrange mylist 0 -1

1) "value2"

2) "value1"

3) "value3"
右以看到value3插入到了list的尾部

linsert
在key对应list的特定位置之前或之后添加字符串元素
127.0.0.1:6379> lrange mylist 0 -1

1) "value2"

2) "value1"

3) "value3"
在value1之前添加value0

127.0.0.1:6379> linsert mylist before 'value1' 'value0'

(integer) 4

127.0.0.1:6379> lrange mylist 0 -1

1) "value2"

2) "value0"

3) "value1"

4) "value3"
在之后value3之后添加value4
127.0.0.1:6379> linsert mylist after 'value3' 'value4'

(integer) 5

127.0.0.1:6379> lrange mylist 0 -1

1) "value2"

2) "value0"

3) "value1"

4) "value3"

5) "value4"

lset
根据下标设置值
127.0.0.1:6379> lrange mylist 0 -1

1) "value2"

2) "value0"

3) "value1"

4) "value3"

5) "value4"
将下标为－2的值设置成value5。-2也就是倒数第二个位置。所以value3被value5替换了

127.0.0.1:6379> lset mylist -2 value5

OK

127.0.0.1:6379> lrange mylist 0 -1

1) "value2"

2) "value0"

3) "value1"

4) "value5"

5) "value4"

lrem
从list中删除count个与value值相同的元素，
count>0时，从头到尾顺序进行删除
count<0时，从尾到头删除
count=0时，删除全部
127.0.0.1:6379> lrange mylist 0 -1

1) "value0"

2) "value2"

3) "value0"

4) "value1"

5) "value5"

6) "value4"

127.0.0.1:6379> lrem mylist 2 value0

(integer) 2

127.0.0.1:6379> lrange mylist 0 -1

1) "value2"

2) "value1"

3) "value5"

4) "value4"

ltrim
保留指定范围内的值
127.0.0.1:6379> lrange mylist 0 -1

1) "value0"

2) "value1"

3) "value2"

4) "value3"

127.0.0.1:6379> ltrim mylist 1 -2

OK

127.0.0.1:6379> lrange mylist 0 -1

1) "value1"

2) "value2"
保留第二个到倒数第二个之间的值

lpop
从头部删除一个元素，成功则返回删除的值
127.0.0.1:6379> lrange mylist 0 -1

1) "value1"

2) "value2"

3) "value3"

127.0.0.1:6379> lpop mylist

"value1"

rpop
从尾部删除一个元素，成功则返回删除的值
127.0.0.1:6379> lrange mylist 0 -1

1) "value1"

2) "value2"

3) "value3"

127.0.0.1:6379> rpop mylist

"value3"

rpoplpush
从第一个list中拿出最后一个元素，并添加到第二个list的头部
127.0.0.1:6379> lrange list1 0 -1

1) "list1_v1"

2) "list1_v2"

127.0.0.1:6379> lrange list2 0 -1

1) "list2_v1"

2) "list2_v2"

127.0.0.1:6379> rpoplpush list1 list2

"list1_v2"

127.0.0.1:6379> lrange list1 0 -1

1) "list1_v1"

127.0.0.1:6379> lrange list2 0 -1

1) "list1_v2"

2) "list2_v1"

3) "list2_v2"

lindex
通过下标拿list的到元素
127.0.0.1:6379> lrange mylist 0 -1

1) "value1"

2) "value2"

127.0.0.1:6379> lindex mylist 1

"value2"

127.0.0.1:6379> lindex mylist -1

"value2"

llen
拿到list元素的个数
127.0.0.1:6379> lrange mylist 0 -1

1) "value1"

2) "value2"

127.0.0.1:6379> llen mylist

(integer) 2