java.math.BigInteger cannot be cast to java.lang.Integer
java.math.BigInteger cannot be cast to java.lang.Integer获取数量的时候 转换错误：
sql语句：SELECT COUNT(*) FROM online_test_student WHERE test_id=? AND test_status=?
修改前：Integer studentNumber= (Integer)query.uniqueResult();
修改后：Integer studentNumber= Integer.parseInt(query.uniqueResult().toString());
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