错误原因
- 分析
本次报错的原因在于sql语句未查询到数据，返回为null。而我们定义的dao层方法是返回为int，就会出现如下这样的提示：
return null from a method with a primitive return type (int).（试图从具有原始返回类型（int）的方法返回null）
Ingeter是int的包装类，int的初值为0，Ingeter的初值为null
- 解决方式
将dao层的返回类型改为Integer即可。
改为：
使用mybatis报错：Mapper method 'com.xin.dao.BlogMapper.addBlog attempted to return null from a method with a primitive return type (int).
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