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                一、先去實現對應的service接口,來定義有哪些功能要實現 ### ![](https://img.kancloud.cn/fd/3b/fd3b9215a9303a4a15509496f58b7af5_2366x1530.png) ### 二、去實現service接口的具體實現 ### ![](https://img.kancloud.cn/a5/d0/a5d092273cc557fee6296b2b69f10f40_2374x1812.png) ### 三、去寫mapper接口也就是去寫實際的操作數據庫的mysql語句 ![](https://img.kancloud.cn/a6/7c/a67c1a21d198ef76b2cc0750c4746ae3_2854x1816.png) ### 四、編寫controller ### ![](https://img.kancloud.cn/fd/05/fd052a780647487e711dee0a743cc21f_2556x1752.png) ### 五、涉及到的domain也就是dao層我們在前面已經使用mysql的逆向工程創建好了 ### **新增之后如何獲取插入到數據庫當中這條記錄的ID** ![](https://img.kancloud.cn/bb/e6/bbe6b21d9f279fe62b6466af6e631088_2704x1664.png) ### 然后在service當中就可以通過實體調用getId方法獲取剛插入的記錄的最新的id了 ### ![](https://img.kancloud.cn/aa/c2/aac20360e3592759b56da24daef57031_2664x1698.png) ### **數據庫字段下劃線和java實體類的映射如何解決?** ### 也就是說mysql當中的cover_img應該對應java實體類當中的coverImg字段才對 ### 我們只需要在application.properties當中進行mysql的配置即可 數據庫字段下劃線和Java實體類映射: # mybatis 下劃線轉駝峰配置,兩者都可以 #mybatis.configuration.mapUnderscoreToCamelCase=true mybatis.configuration.map-underscore-to-camel-case=true 如下圖所示: ![](https://img.kancloud.cn/45/6d/456d7ed9fcb98ee3063ca4764bca2977_1277x884.png)
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