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                            之前我們都是在使用自動創建好的代碼進行各種操作，今天終于遇到了不能滿足我們使用需求的情況，所以我們需要自定義mapper以及mapper.xml文件來實現sql的操作，記錄一下
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![](https://img.kancloud.cn/17/01/170113bc7aa14512f864568cd8b73fe1_542x929.png)
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![](https://img.kancloud.cn/a3/ba/a3ba76dcfa40040ef3b5508be4383388_1626x999.png)
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![](https://img.kancloud.cn/38/dd/38dddd94d4fd65ef20cd369820d1796b_1221x999.png)
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引入直接使用即可
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![](https://img.kancloud.cn/5b/82/5b82bb1b362376001624958dd57bbf94_1579x947.png)
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除了上面寫xml的形式我更愿意去mapper當中寫注解的形式來完成sql的相關操作
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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