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< b > SetnxCommand: Contents< / b > < br > < a href = "#SETNX _key_ _value_" > SETNX _key_ _value_< / a > < br > < a href = "#Return value" > Return value< / a >
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ï » ¿ #sidebar < a href = "StringCommandsSidebar.html" > StringCommandsSidebar< / a > < h1 > < a name = "SETNX _key_ _value_" > SETNX _key_ _value_< / a > < / h1 >
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< i > Time complexity: O(1)< / i > < blockquote > SETNX works exactly like < a href = "SetCommand.html" > SET< / a > with the only difference thatif the key already exists no operation is performed.SETNX actually means " SET if Not eXists" .< / blockquote >
< h2 > < a name = "Return value" > Return value< / a > < / h2 > < a href = "ReplyTypes.html" > Integer reply< / a > , specifically:< br / > < br / > < pre class = "codeblock python" name = "code" >
1 if the key was set
0 if the key was not set
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