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# SETNX

**SETNX key value**

將 `key` 的值設為 `value` ，當且僅當 `key` 不存在。

若給定的 `key` 已經存在，則 [SETNX](#setnx) 不做任何動作。

[SETNX](#setnx) 是『SET if Not eXists』(如果不存在，則 SET)的簡寫。

**可用版本：**

&gt;= 1.0.0

**時間復雜度：**

O(1)

**返回值：**

設置成功，返回 `1` 。設置失敗，返回 `0` 。

```
redis> EXISTS job                # job 不存在
(integer) 0

redis> SETNX job "programmer"    # job 設置成功
(integer) 1

redis> SETNX job "code-farmer"   # 嘗試覆蓋 job ，失敗
(integer) 0

redis> GET job                   # 沒有被覆蓋
"programmer"

```

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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