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# RENAMENX

**RENAMENX key newkey**

當且僅當 `newkey` 不存在時，將 `key` 改名為 `newkey` 。

當 `key` 不存在時，返回一個錯誤。

**可用版本：**

&gt;= 1.0.0

**時間復雜度：**

O(1)

**返回值：**

修改成功時，返回 `1` 。如果 `newkey` 已經存在，返回 `0` 。

```
# newkey 不存在，改名成功

redis> SET player "MPlyaer"
OK

redis> EXISTS best_player
(integer) 0

redis> RENAMENX player best_player
(integer) 1

# newkey存在時，失敗

redis> SET animal "bear"
OK

redis> SET favorite_animal "butterfly"
OK

redis> RENAMENX animal favorite_animal
(integer) 0

redis> get animal
"bear"

redis> get favorite_animal
"butterfly"

```

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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