出错信息：SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '-7,7' at line 1
出错SQL：select * from ex_news where news_type=1 order by news_addtime desc limit -7,7
出错文件地址：/weipai/horo.cc/inc/mysql_class.php
出错行号：181行
出错代码：42000