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                            ### 設置別名
設置表的別名，只在查詢時生效，建議關聯表時才設置。

**函數：**
alias($alias = '')；
**參數說明：**
$alias 別名，只能是字符串
**返回值：**
本對象，支持鏈級操作。

**案例**
~~~
設置別名
$model=new Model('user');
$model->alias('u');

~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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