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                            一般情況下，僅僅使用Model層已經夠用，但如果項目比較大，建議對模型進行分層，

例如使用數據層、邏輯層和服務層等等，

視項目需求而定，原則就是避免某一層過大導致結構雜亂，盡量讓各個層分工明確，各司其職。
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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