HSETNX

Usage:

HSETNX key field value

Complexity:

O(1)

Since:

2.0.0

ACL Categories:

@fast, @hash, @write

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.

Reply

One of the following:

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

Examples

127.0.0.1:6379> HSETNX myhash field "Hello"
(integer) 1
127.0.0.1:6379> HSETNX myhash field "World"
(integer) 0
127.0.0.1:6379> HGET myhash field
"Hello"