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反射練習錯誤nested exception is Expected one result (or null) to be returned by selectOne(), but found: 20
時間 2021-07-10
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練習反射的時候獲取數據庫中數據,直接報錯了 mapper.xml配置文件是這樣嬸的 將數據直接存在map中,這樣我再使用反射獲取數據 錯誤原因,多條數據返回的是list類型,但是我給自定義返回的是Map,這樣就可以練習自己的反射 解決方法:查詢某一條數據,或者返回結果爲List 如果必須要返回時Map,像我一樣要用Map就將map放在list中 如 List<Map<String ,Object
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Expected one result (or null) to be returned by selectOne(), but found: 20
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