解決方法：
方法1：將boolean、int、long等基本數據類型改為封裝數據類型，boolean封裝數據類型為Boolean、int封裝數據類型為Integer，根據個人項目邏輯，對返回值進行判斷即可。
方法2：使用MySQL種的IFNULL函數，IFNULL函數是MySQL控制流函數之一，它可以接受兩個參數，如果查詢結果不是NULL，則返回第一個參數。 否則返回第二個參數。兩個參數也可以是文字或表達式。
attempted to return null from a method with a primitive return type (int)
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