出错信息：No database selected

出错文件：/www/wwwroot/boao/app/home/controller/IndexController.class.php

错误行：28

Trace信息：
#0 /www/wwwroot/boao/app/home/controller/IndexController.class.php(28) mysqli->query()
#1 /www/wwwroot/boao/framework/base/App.php(64) app\home\controller\IndexController->index()
#2 /www/wwwroot/boao/framework/core.php(98) framework\base\App::run()
#3 /www/wwwroot/boao/index.php(6) require()