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我通过Hibernate,由于某种原因它给我这个错误运行Java中的聚合函数:休眠=列
INFO Binary:182 - could not read column value from result set: l_date; Column 'l_date' not found.
当我运行MySQL查询列名l_date和登录名和我无法弄清楚为什么它没有发现这一点。
我已经在MySQL中测试了这个查询,并证实它确实有效。我的功能如下所示。
public List<Logins> getUserLoginsByMonth() {
Session session = getSessionFactory().openSession();
ArrayList<Logins> loginList = null;
try {
String SQL_QUERY = "SELECT l_date as l_month, SUM(logins) as logins FROM (SELECT DATE_FORMAT(login_time, '%M') as l_date, COUNT(DISTINCT users) as logins FROM user_logins WHERE login_time > DATE_SUB(NOW(), INTERVAL 1 YEAR) GROUP BY DATE(login_time)) AS Z GROUP BY(l_month)";
Query query = session.createSQLQuery(SQL_QUERY);
List results = query.list();
for(ListIterator iter = results.listIterator(); iter.hasNext()) {
Objects[] row = (Object[])iter.next();
System.out.println((Date)row[0}]);
System.out.println((BigInteger)row[1]);
}
}
catch(HibernateException e) {
throw new PersistenceDaoException(e);
}
finally {
session.close();
}
}
是否有任何替代方法,然后添加addScalar? – Kathir 2012-12-06 14:42:32