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redis HSETNX command

Chinese translationRecent Updates：2018-05-16 11:01:05

set

英[set] 美[sɛt]

vt. Set; place, arrange; put in a certain situation; place tableware

vi. Setting off; setting off; condensation

n.Gathering; a set; a set; a TV set

adj. Fixed; located in...; stubborn; arranged The

third person singular: sets plural: sets present participle: setting past tense: set past participle: set

redis HSETNX command Video explanation

redis HSETNX command syntax

Function: Set the value of the field field in the hash table key to value if and only if the field field does not exist.

Syntax: HSETNX key field value

Description: If the domain field already exists, this operation is invalid. If key does not exist, a new hash table is created and the HSETNX command is executed.

Available versions: >= 2.0.0

Time complexity: O(1)

Return: Set successfully, return 1. If the given domain already exists and no operations were performed, 0 is returned.

redis HSETNX command example

redis> HSETNX nosql key-value-store redis
(integer) 1
redis> HSETNX nosql key-value-store redis       # 操作无效，域 key-value-store 已存在
(integer) 0

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