Unknown MySQL server host 'bdm288811641.my3w.com' (1)

FILE: /usr/home/byu3943830001/htdocs/ThinkPHP/Library/Think/Db/Driver/Mysqli.class.php 　LINE: 45

#0 /usr/home/byu3943830001/htdocs/ThinkPHP/Library/Think/Db/Driver/Mysqli.class.php(45): E('Unknown MySQL s...')
#1 /usr/home/byu3943830001/htdocs/ThinkPHP/Library/Think/Db.class.php(164): Think\Db\Driver\Mysqli->connect()
#2 /usr/home/byu3943830001/htdocs/ThinkPHP/Library/Think/Db/Driver/Mysqli.class.php(76): Think\Db->initConnect(false)
#3 /usr/home/byu3943830001/htdocs/ThinkPHP/Library/Think/Db/Driver/Mysqli.class.php(209): Think\Db\Driver\Mysqli->query('SHOW COLUMNS FR...')
#4 /usr/home/byu3943830001/htdocs/ThinkPHP/Library/Think/Model.class.php(130): Think\Db\Driver\Mysqli->getFields('le_category')
#5 /usr/home/byu3943830001/htdocs/ThinkPHP/Library/Think/Model.class.php(118): Think\Model->flush()
#6 /usr/home/byu3943830001/htdocs/ThinkPHP/Library/Think/Model.class.php(1298): Think\Model->_checkTableInfo()
#7 /usr/home/byu3943830001/htdocs/ThinkPHP/Library/Think/Model.class.php(95): Think\Model->db(0, '', true)
#8 /usr/home/byu3943830001/htdocs/App/Admin/Model/BaseModel.class.php(9): Think\Model->__construct()
#9 /usr/home/byu3943830001/htdocs/App/Admin/Model/CategoryModel.class.php(8): Admin\Model\BaseModel->__construct()
#10 /usr/home/byu3943830001/htdocs/ThinkPHP/Common/functions.php(527): Admin\Model\CategoryModel->__construct('Category')
#11 /usr/home/byu3943830001/htdocs/App/Home/Controller/CategoryController.class.php(210): D('Admin/Category')
#12 /usr/home/byu3943830001/htdocs/App/Home/Controller/CategoryController.class.php(14): Home\Controller\CategoryController->_getCategory()
#13 [internal function]: Home\Controller\CategoryController->index()
#14 /usr/home/byu3943830001/htdocs/ThinkPHP/Library/Think/App.class.php(164): ReflectionMethod->invoke(Object(Home\Controller\CategoryController))
#15 /usr/home/byu3943830001/htdocs/ThinkPHP/Library/Think/App.class.php(202): Think\App::exec()
#16 /usr/home/byu3943830001/htdocs/ThinkPHP/Library/Think/Think.class.php(123): Think\App::run()
#17 /usr/home/byu3943830001/htdocs/ThinkPHP/ThinkPHP.php(98): Think\Think::start()
#18 /usr/home/byu3943830001/htdocs/index.php(11): require('/usr/home/byu39...')
#19 {main}