Redis
Redis
  • 请登录查看
字典 我要纠错

setnx

SETNX

SETNX key value

Available since 1.0.0.

Time complexity: O(1)

Set key to hold string value if key does not exist. In that case, it is equal to SET. When key already holds a value, no operation is performed. SETNX is short for "SET if Not eXists".

Return value

Integer reply, specifically:

  • 1 if the key was set
  • 0 if the key was not set

Examples

redis> SETNX mykey "Hello" (integer) 1