LINSERT key BEFORE|AFTER pivot element

Inserts element in the list stored at key either before or after the reference value pivot.

When key does not exist, it is considered an empty list and no operation is performed.

An error is returned when key exists but does not hold a list value.

*返回值

整数: the length of the list after the insert operation, or -1 when the value pivot was not found.

*例子

redis>  RPUSH mylist "Hello"
(integer) 1
redis>  RPUSH mylist "World"
(integer) 2
redis>  LINSERT mylist BEFORE "World" "There"
(integer) 3
redis>  LRANGE mylist 0 -1
1) "Hello"
2) "There"
3) "World"
redis>