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                            ### 3.1.2 切換數據庫

每個redis客戶端都有自己的目標數據庫(默認為`db[0]`)，可以通過`SELECT`切換目標數據庫。
```
redis> GET msg
"hello"

redis> SELECT 2
OK

redis[2]> GET msg
(nil)
```

客戶端狀態redisClient結構的db屬性記錄了當前的目標數據庫，通過修改指針便實現了切換數據庫的功能：
```c
typedef struct client {
    ...
    redisDb *db; // 客戶端當前正在使用的數據庫
    ...
}
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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