Redis Msetnx Command

Redis String

The Redis Msetnx command is used to set one or more key-value pairs simultaneously when none of the given keys exist.

Syntax

The basic syntax of the Redis Msetnx command is as follows:

redis 127.0.0.1:6379> MSETNX key1 value1 key2 value2 .. keyN valueN 

Available Versions

>= 1.0.1

Return Value

When all keys are successfully set, return 1. If all given keys fail to be set (at least one key already exists), then return 0.

Example

# 对不存在的 key 进行 MSETNX

redis> MSETNX rmdbs "MySQL" nosql "MongoDB" key-value-store "redis"
(integer) 1

redis> MGET rmdbs nosql key-value-store
1) "MySQL"
2) "MongoDB"
3) "redis"


# MSET 的给定 key 当中有已存在的 key

redis> MSETNX rmdbs "Sqlite" language "python"  # rmdbs 键已经存在，操作失败
(integer) 0

redis> EXISTS language                          # 因为 MSET 是原子性操作，language 没有被设置
(integer) 0

redis> GET rmdbs                                # rmdbs 也没有被修改
"MySQL"

Redis String

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