String整合Hibernate Hql出现user is not mapped [FROM USER WHERE username =？ and password=?
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上次写过一次没出现错误，当时没注意到一个关键的问题，困扰了好久。
当调用hibernate的hql语句进行查询的时候，需要特别注意：
举个例子：String hql = "from User where username = ? and password = ?";
User这个是不是数据库中的表名而是实体类下访问的类名；大家有时间可以去学学hql；希望可以帮到大家
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