解决方法：
方法1：将boolean、int、long等基本数据类型改为封装数据类型，boolean封装数据类型为Boolean、int封装数据类型为Integer，根据个人项目逻辑，对返回值进行判断即可。
方法2：使用MySQL种的IFNULL函数，IFNULL函数是MySQL控制流函数之一，它可以接受两个参数，如果查询结果不是NULL，则返回第一个参数。 否则返回第二个参数。两个参数也可以是文字或表达式。
attempted to return null from a method with a primitive return type (int)
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