錯誤原因
- 分析
本次報錯的原因在於sql語句未查詢到數據，返回為null。而我們定義的dao層方法是返回為int，就會出現如下這樣的提示：
return null from a method with a primitive return type (int).（試圖從具有原始返回類型（int）的方法返回null）
Ingeter是int的包裝類，int的初值為0，Ingeter的初值為null
- 解決方式
將dao層的返回類型改為Integer即可。
改為：
使用mybatis報錯：Mapper method 'com.xin.dao.BlogMapper.addBlog attempted to return null from a method with a primitive return type (int).
免責聲明！
本站轉載的文章為個人學習借鑒使用，本站對版權不負任何法律責任。如果侵犯了您的隱私權益，請聯系本站郵箱yoyou2525@163.com刪除。
猜您在找
Mapper method 'com.xxxx.other.dao.MyDao.getNo attempted to return null from a method with a primitive return type (int)
mybatis查詢時使用基本數據類型接收報錯-attempted to return null from a method with a primitive return type (int)
mysql查詢null異常:attempted to return null from a method with a primitive return type
SpringAop時Null return value from advice does not match primitive return type for: public int...異常
Null return value from advice does not match primitive
Thyemleaf報錯: Method call: Attempted to call method *** on null context object
Error:java: Can‘t generate mapping method with primitive return type.
Optional int parameter 'id' is present but cannot be translated into a null value due to being declared as a primitive type.
SpringBoot使用MyBatis報錯：Error invoking SqlProvider method (tk.mybatis.mapper.provider.base.BaseInsertProvider.dynamicSQL)
Null value was assigned to a property of primitive type setter