Expected one result (or null) to be returned by selectOne(), but found: 20
今天項目報了標題上這個錯，花了不少時間解決，現在分享下過程，希望遇到類似問題的朋友能節省點時間。 根據錯誤提示的意思，是返回值的問題，於是檢查了幾遍mapper,確認sql語句無誤後，又檢查了dao中的返回值類型，也正確。 那麼問題來了，返回值類型正確，也不是resultmap，resulttype的問題，難不成是Mybatis哪裏配置出錯了？可是我明明之前都還正常。 百思不得姐的時候，找了大牛請
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