mybatis返回boolean值时数据库返回null

Servlet.service() for servlet [springDispatcherServlet] in context with path [/ms] threw exception [Request processing failed; nested exception is org.apache.ibatis.binding.BindingException: Mapper method 'com.ms.dao.AdminDao.checkLoginAdminInfo attempted to return null from a method with a primitive return type (boolean).] with root cause
org.apache.ibatis.binding.BindingException: Mapper method 'com.ms.dao.AdminDao.checkLoginAdminInfo attempted to return null from a method with a primitive return type (boolean).

参考：

https://blog.csdn.net/lw1242189467/article/details/80812881

https://blog.csdn.net/hbxtw/article/details/10133229