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HSETNX key field value

相关命令

• HDEL
• HEXISTS
• HGET
• HGETALL
• HINCRBY
• HINCRBYFLOAT
• HKEYS
• HLEN
• HMGET
• HMSET
• HSCAN
• HSET
• HSETNX
• HVALS

Available since 2.0.0.

时间复杂度： O(1)

Sets field in the hash stored at key to value, only if field does not yet exist. If key does not exist, a new key holding a hash is created. If field already exists, this operation has no effect.

返回值

Integer reply, specifically:

• 1 if field is a new field in the hash and value was set.
• 0 if field already exists in the hash and no operation was performed.

例子

redis> HSETNX myhash field "Hello"

(integer) 1

redis> HSETNX myhash field "World"

(integer) 0

redis> HGET myhash field

"Hello"

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