错误截图：

org.apache.ibatis.binding.BindingException: Mapper method 'com.shop_demo.dao.AdminDAO.getAdminByNameAndPassword attempted to return null from a method with a primitive return type (int).at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:102)at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:58)at com.sun.proxy.$Proxy8.getAdminByNameAndPassword(Unknown Source)at com.test.admin.admintest.get(admintest.java:55)at com.test.admin.admintest.main(admintest.java:74)

翻译过来是：

试图从具有基元返回类型（int）的方法返回空值。

解决办法：

将返回值boolean封装数据类型为Boolean、int封装数据类型为Integer。

当boolean、int、long等数据类型作为返回值时，用mybatis查询的结果null时，会出现错误，查了查才发现这些基本数据类型是不能定义为null的。
也就是说当数据库查询结果为null时，不能直接使用boolean、int、long等基本数据类型作为返回值。

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Mybatis中的attempted to return null from a method with a primitive return type (int).异常

错误截图：

翻译过来是：

解决办法：

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