redis: List列表类型(四)

list设置值(头部):lpush list one

list设置值(尾部):**rpush ** list one

list获取值:lrange list 0 -1

list获取指定范围的值:lrange list 0 1

127.0.0.1:6379> lpush list one #头部插入一个值
(integer) 1
127.0.0.1:6379> lpush list two #头部插入一个值
(integer) 2
127.0.0.1:6379> lpush list three #头部插入一个值
(integer) 3
127.0.0.1:6379> lrange list 0 -1 #获取所有值
1) "three"
2) "two"
3) "one"
127.0.0.1:6379> lrange list 0 1 #获取0 1的值
1) "three"
2) "two"
127.0.0.1:6379> rpush list four #尾部插入一个值
(integer) 4
127.0.0.1:6379> lrange list 0 -1 #查看刚才插入的值
1) "three"
2) "two"
3) "one"
4) "four"

list移除一个值(头部):lpop list

list移除一个值(尾部):rpop list

127.0.0.1:6379> lrange list 0 -1 #查看list元素
1) "three"
2) "two"
3) "one"
4) "four"
127.0.0.1:6379> lpop list #移除头部元素
"three"
127.0.0.1:6379> lrange list 0 -1 #第一个元素被移除
1) "two"
2) "one"
3) "four"
127.0.0.1:6379> rpop list #移除尾部元素
"four"
127.0.0.1:6379> lrange list 0 -1 #最后一个元素被移除
1) "two"
2) "one"

list移除指定的值(几个):lrem list 1 one
list移除指定的值(所有):lrem list 0 one

127.0.0.1:6379> lrange list 0 -1
1) "one"
2) "one"
3) "one"
4) "one"
5) "one"
6) "one"
7) "two"
8) "three"
127.0.0.1:6379> lrem list 1 one #移除一个one元素
(integer) 1
127.0.0.1:6379> lrange list 0 -1
1) "one"
2) "one"
3) "one"
4) "one"
5) "one"
6) "two"
7) "three"
127.0.0.1:6379> lrem list 0 one #移除所有的one元素
(integer) 5
127.0.0.1:6379> lrange list 0 -1
1) "two"
2) "three"

通过下标获取值:lindex list 0

127.0.0.1:6379> lrange list 0 -1 #查看元素
1) "one"
2) "two"
3) "three"
127.0.0.1:6379> lindex list 0 #获取下标为0的元素
"one"
127.0.0.1:6379> lindex list 2 #获取下标为2的元素
"three"

查看list长度:llen list

127.0.0.1:6379> lrange list 0 -1
1) "one"
2) "two"
3) "three"
127.0.0.1:6379> llen list #查看长度
(integer) 3

修剪list:ltrim list 0 2

127.0.0.1:6379> lrange list 0 -1
1) "four"
2) "three"
3) "two"
4) "one"
127.0.0.1:6379> ltrim list 0 2 #只保留0 1 2元素,list实际上已经改变了
OK
127.0.0.1:6379> lrange list 0 -1
1) "four"
2) "three"
3) "two"

移除最后一个元素并添加到一个新的list:rpoplpush mylist otherlist

127.0.0.1:6379> lrange mylist 0 -1
1) "one"
2) "two"
3) "three"
127.0.0.1:6379> rpoplpush mylist otherlist #移除mylist的最后一个元素并添加到otherlist
"three"
127.0.0.1:6379> lrange mylist 0 -1 #mylist已经移除了最后一个元素
1) "one"
2) "two"
127.0.0.1:6379> lrange otherlist 0 -1 #otherlist添加了一个元素
1) "three"

更新一个值(list必须要存在,下标元素必须要存在):lset mylist 0 one

127.0.0.1:6379> lset mylist 0 one #如果list不存在会报错
(error) ERR no such key
127.0.0.1:6379> lpush mylist one #创建mylist
(integer) 1
127.0.0.1:6379> lpush mylist two
(integer) 2
127.0.0.1:6379> lrange mylist 0 -1 #查看mylist元素
1) "two"
2) "one"
127.0.0.1:6379> lset mylist 0 heihei #更新下标为0的元素值
OK
127.0.0.1:6379> lrange mylist 0 -1 #修改成功
1) "heihei"
2) "one"
127.0.0.1:6379> lset mylist 3 haha #更新不存在的下标元素 失败
(error) ERR index out of range

插入一个值(在某个元素前面):linsert mylist before "world" "new"
插入一个值(在某个元素后面):linsert mylist after"world" "new"

127.0.0.1:6379> lrange mylist 0 -1
1) "hello"
2) "world"
127.0.0.1:6379> linsert mylist before "world" "new" #在wolrd前面插入new
(integer) 3
127.0.0.1:6379> lrange mylist 0 -1
1) "hello"
2) "new"
3) "world"
127.0.0.1:6379> linsert mylist after "world" "old" #在wolrd后面插入old
(integer) 4
127.0.0.1:6379> lrange mylist 0 -1
1) "hello"
2) "new"
3) "world"
4) "old"

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转载自www.cnblogs.com/applesnt/p/12642293.html