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BUG之Expected one result (or null) to be returned by selectOne(), but found: 4
時間 2021-07-12
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Java
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意思是,本來要返回一個對象,卻找到了四個。 上面這個報錯是因爲,用戶在登陸的時候,要輸入正確的賬號和密碼才能訪問跳轉到他對應的頁面。 所以要確保一個賬號對應一個用戶,用戶密碼相同無所謂,但是賬戶名一定不能重複,否則就會和我一樣報錯。 所以, 我把數據庫相同的用戶刪掉,然後做用戶名重複的判斷,如果用戶名已存在,就提示用戶該用戶名已被註冊,這樣就不會造成用戶名重複的問題。
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