出错信息：Database SQL: "select * from dux_content where class_id = order by rand() limit 4". ErrorInfo: 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 rand() limit 4' at line 1

出错文件：/application/www_new/vhall_bsite_2017/business/framework/base/db/MysqlDriver.php

错误行：39

Trace信息：
#0 /application/www_new/vhall_bsite_2017/business/framework/base/Model.php(37) framework\base\db\MysqlDriver->query()
#1 /application/www_new/vhall_bsite_2017/business/app/article/controller/ContentController.php(31) framework\base\Model->query()
#2 /application/www_new/vhall_bsite_2017/business/framework/base/App.php(46) app\article\controller\ContentController->index()
#3 /application/www_new/vhall_bsite_2017/business/framework/core.php(144) framework\base\App::run()
#4 /application/www_new/vhall_bsite_2017/business/index.php(151) require()