HTTP Status 500: Expected one result (or null) to be returned by selectOne(), but found: 2

阿新 • • 發佈：2018-12-01

瀏覽器報這種錯：HTTP Status 500 - Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found: 2

ps：內心早已崩潰~寫個登入而已這麼多搞事情的報錯~就比如上面這行報錯，花了我幾個小時去找錯誤！沒想到吧~ 原來這行程式碼指的是資料庫的資料有重複的~要不是我最後找不出bug，去瞅了兩眼資料表的資料，我還真發現不了使用者表有兩行資料是一摸一樣的，難怪登入對的賬號就報這種錯，輸入錯的賬號就不報錯，原來是資料重複多出來了，早就應該想到的，我竟然固執的以為mapper檔案出錯，還以為傳參出錯，什麼能想到的都想到了，就是沒有解決問題，這下好了，就算找出了問題所在，我也不開心，哼~（搞死我了~哭~），最後再說一次以後做登入的資料別寫重複的登入資料了，小心頭，唉，粗心了！

HTTP Status 500: Expected one result (or null) to be returned by selectOne(), but found: 2

瀏覽器報這種錯：HTTP Status 500 - Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.iba

Expected one result (or null) to be returned by selectOne(), but found: 2 和 java.lang.UnsupportedOperationException異常

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HTTP Status 500: Expected one result (or null) to be returned by selectOne(), but found: 2

瀏覽器報這種錯：HTTP Status 500 - Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found: 2

HTTP Status 500: Expected one result (or null) to be returned by selectOne(), but found: 2

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HTTP Status 500: Expected one result (or null) to be returned by selectOne(), but found: 2

瀏覽器報這種錯：HTTP Status 500 - Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found: 2

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