org.springframework.dao.EmptyResultDataAccessException
EmptyResultDataAccessException异常，Spring这样做的目的是为了防止程序员不对空值 ...
原文：org.springframework.dao.EmptyResultDataAccessException
异常信息： org.springframework.dao.EmptyResultDataAccessException: Incorrect result size: expected , actual at org.springframework.dao.support.DataAccessUtils.requiredSingleResult DataAccessUtils.java: at ...
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