redis LREM command
Translation results：
rem
UK[ˌɑ:r i: ˈem] US[ˌɑ:ri:'em]
n.DOS command: Specify the command line ignored by DOS; (sleep) fast
of eye movementsredis LREM commandsyntax
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 commandexample
# 先创建一个表，内容排列是 # 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 # 移除从表头到表尾，最先发现的两个 morning (integer) 2 # 两个元素被移除 redis> LLEN greet # 还剩 3 个元素 (integer) 3 redis> LRANGE greet 0 2 1) "hello" 2) "hello" 3) "morning" redis> LREM greet -1 morning # 移除从表尾到表头，第一个 morning (integer) 1 redis> LLEN greet # 剩下两个元素 (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 # 两个 hello 被移除 redis> LLEN greet (integer) 0