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                            好的數據庫規范有助于減少軟件實現的復雜度，降低溝通成本，本鐵律主要涵蓋了建庫建表、建索引、寫 SQL、ORM 映射等方面的處理約定。

1.建庫鐵律
![](https://img.kancloud.cn/17/fd/17fd3d78c14c3d6b3c9c739ba27e0355_962x118.jpg)

## 2.建表鐵律
![](https://img.kancloud.cn/88/b9/88b97acc2baa784ac990bcb9c9dbcc7d_962x645.jpg)

設置合適的字符存儲長度，不但可以節約數據庫表空間和索引存儲，更重要的是能夠提升檢索速度。

## 3.建索引鐵律
![](https://img.kancloud.cn/d2/8c/d28ce55df1fc5692129c617108f19679_962x477.jpg)

## 4.寫SQL鐵律
![](https://img.kancloud.cn/e1/77/e1779c2112d65aad521855da07bde0b2_962x584.jpg)

## 5.ORM映射鐵律
![](https://img.kancloud.cn/4d/f6/4df68e8dfda113664a098d46d451fa42_962x584.jpg)

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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