redis中list列表类型常用命令

redis中list列表类型常用命令

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Redis 列表是简单的字符串列表，按照插入顺序排序，你可以添加一个元素到列表的头部（左边）或者尾部（右边）

它的底层实际是个双向链表，对两端的操作性能很高，通过索引下标的操作中间的节点性能会较差

下面介绍一些List类型的常用命令

• 从指定key对应List左边插入值：lpush key value1 value2 value3......，eg：

127.0.0.1:6379> lpush key1 k1v1 k1v2 k1v3
(integer) 3

• 从指定key对应List左边开始获取指定范围的value：lrange key 起始位置 结束位置（-1表示末尾），eg：

127.0.0.1:6379> lrange key1 0 -1
1) "k1v3"
2) "k1v2"
3) "k1v1"
127.0.0.1:6379> lrange key1 0 1
1) "k1v3"
2) "k1v2"

• 从指定key对应List右边插入值：rpush key value1 value2 value3......，eg：

127.0.0.1:6379> rpush key2 k2v1 k2v2 k2v3
(integer) 3
127.0.0.1:6379> lrange key2 0 -1
1) "k2v1"
2) "k2v2"
3) "k2v3"

• 从指定key对应List左边|右边移除一个值：lpop|rpop key，eg：

127.0.0.1:6379> lrange key1 0 -1
1) "k1v3"
2) "k1v2"
3) "k1v1"
127.0.0.1:6379> lpop key1
"k1v3"
127.0.0.1:6379> lrange key1 0 -1
1) "k1v2"
2) "k1v1"
127.0.0.1:6379> rpop key1
"k1v1"
127.0.0.1:6379> lrange key1 0 -1
1) "k1v2"
# 当List中值全部移除,对应key也没了
127.0.0.1:6379> lpop key1
"k1v2"
127.0.0.1:6379> keys *
1) "key2"

• 将key1对应List从右边取出一个值插入到key2对应List左边：rpoplpush key1 key2

127.0.0.1:6379> lrange key1 0 -1
1) "k1v3"
2) "k1v2"
3) "k1v1"
127.0.0.1:6379> lrange key2 0 -1
1) "k2v1"
2) "k2v2"
3) "k2v3"
127.0.0.1:6379> rpoplpush key1 key2
"k1v1"
127.0.0.1:6379> lrange key1 0 -1
1) "k1v3"
2) "k1v2"
127.0.0.1:6379> lrange key2 0 -1
1) "k1v1"
2) "k2v1"
3) "k2v2"
4) "k2v3"

• 获取key对应List中指定下标值：lindex key 下标，eg：

127.0.0.1:6379> lrange key2 0 -1
1) "k1v1"
2) "k2v1"
3) "k2v2"
4) "k2v3"
127.0.0.1:6379> lindex key2 0
"k1v1"

• 获取key对应List的长度：llen key，eg：

127.0.0.1:6379> lrange key2 0 -1
1) "k1v1"
2) "k2v1"
3) "k2v2"
4) "k2v3"
127.0.0.1:6379> llen key2
(integer) 4

• 从指定key对应List左边移除n个value：lrem key n value，eg：

127.0.0.1:6379> lrange key2 0 -1
1) "k1v1"
2) "k2v1"
3) "k2v2"
4) "k2v3"
127.0.0.1:6379> lrem key2 1 k1v1
(integer) 1
127.0.0.1:6379> lrange key2 0 -1
1) "k2v1"
2) "k2v2"
3) "k2v3"

• 从指定key对应List左边截取指定位置value：ltrim key 起始位置 结束位置，eg：

127.0.0.1:6379> lrange key2 0 -1
1) "k2v1"
2) "k2v2"
3) "k2v3"
127.0.0.1:6379> ltrim key2 0 1
OK
127.0.0.1:6379> lrange key2 0 -1
1) "k2v1"
2) "k2v2"

• 将指定key对应List指定下标的value替换成新的value：lset key 下标 value，eg：

127.0.0.1:6379> lrange key2 0 -1
1) "k2v1"
2) "k2v2"
127.0.0.1:6379> lset key2 0 k2v1-new
OK
127.0.0.1:6379> lrange key2 0 -1
1) "k2v1-new"
2) "k2v2"

• 在指定key对应List的指定value前面插入值：linsert|rinsert key before|after value value（后面的value是插入的值），eg：

127.0.0.1:6379> lrange key2 0 -1
1) "k2v1-new"
2) "k2v2"
127.0.0.1:6379> linsert key2 before k2v1-new k2v-insert
(integer) 3
127.0.0.1:6379> lrange key2 0 -1
1) "k2v-insert"
2) "k2v1-new"
3) "k2v2"
127.0.0.1:6379> linsert key2 after k2v1-new k2v-insert-after
(integer) 4
127.0.0.1:6379> lrange key2 0 -1
1) "k2v-insert"
2) "k2v1-new"
3) "k2v-insert-after"
4) "k2v2"