rem
UK[?ɑ:r i: ?em] US[?ɑ:ri:'em]
n.DOS command: Specify the command line ignored by DOS; (sleep) fast
of eye movementsredis LREM command syntax
Function: According to the value of parameter count, remove elements from the list that are equal to parameter value.
Syntax: LREM key count value
Available versions:>= 1.0.0
Time complexity Degree: O(N), N is the length of the list.
Returns: The number of removed elements. Because a non-existing key is considered an empty list, the LREM command always returns 0 when the key does not exist.
redis LREM command example
# 先創(chuàng)建一個(gè)表,內(nèi)容排列是 # morning hello morning helllo morning redis> LPUSH greet "morning" (integer) 1 redis> LPUSH greet "hello" (integer) 2 redis> LPUSH greet "morning" (integer) 3 redis> LPUSH greet "hello" (integer) 4 redis> LPUSH greet "morning" (integer) 5 redis> LRANGE greet 0 4 # 查看所有元素 1) "morning" 2) "hello" 3) "morning" 4) "hello" 5) "morning" redis> LREM greet 2 morning # 移除從表頭到表尾,最先發(fā)現(xiàn)的兩個(gè) morning (integer) 2 # 兩個(gè)元素被移除 redis> LLEN greet # 還剩 3 個(gè)元素 (integer) 3 redis> LRANGE greet 0 2 1) "hello" 2) "hello" 3) "morning" redis> LREM greet -1 morning # 移除從表尾到表頭,第一個(gè) morning (integer) 1 redis> LLEN greet # 剩下兩個(gè)元素 (integer) 2 redis> LRANGE greet 0 1 1) "hello" 2) "hello" redis> LREM greet 0 hello # 移除表中所有 hello (integer) 2 # 兩個(gè) hello 被移除 redis> LLEN greet (integer) 0