Fatal error: Uncaught exception 'DbException' with message '执行[<b><font color="#FF0000">select id from pg_is_class where rid = 4 and class_id= order by list_order desc,id desc</font></b>]出错!<br> <font color=#FF0000> [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 'order by list_order desc,id desc' at line 1</font>' in /data/home/qxu1539600120/htdocs/common/lib/classes/db/DbQueryForMysql.class.php:104 Stack trace: #0 /data/home/qxu1539600120/htdocs/common/lib/classes/db/DbQueryForMysql.class.php(132): DbQueryForMysql->error(10, '??????[<b><font...') #1 /data/home/qxu1539600120/htdocs/common/lib/classes/db/DbQueryForMysql.class.php(375): DbQueryForMysql->execute('select id from ...', 0, 1000) #2 /data/home/qxu1539600120/htdocs/common/apps/IsClass.class.php(123): DbQueryForMysql->select('select id from ...') #3 /data/home/qxu1539600120/htdocs/productsale_view.php(79): IsClass->getAll(' rid = 4 and c...', 'id', ' order in /data/home/qxu1539600120/htdocs/common/lib/classes/db/DbQueryForMysql.class.php on line 104