Redis Msetnx command

Redis string (string)

Redis Msetnx all command does not exist for a given key, and set up one or more key-value pairs.

grammar

redis Msetnx basic command syntax 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 key are successfully set, returns 1. If all the given key are set to fail (at least one key already exists), then 0 is returned.

Examples

# 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 (string)