php_network_getaddresses: getaddrinfo failed: Name or service not known

FILE: /www/wwwroot/www.timelessdeco.com/ThinkPHP/Library/Think/Db/Driver/Mysqli.class.php 　LINE: 45

#0 /www/wwwroot/www.timelessdeco.com/ThinkPHP/Library/Think/Db/Driver/Mysqli.class.php(45): E('php_network_get...')
#1 /www/wwwroot/www.timelessdeco.com/ThinkPHP/Library/Think/Db.class.php(166): Think\Db\Driver\Mysqli->connect()
#2 /www/wwwroot/www.timelessdeco.com/ThinkPHP/Library/Think/Db/Driver/Mysqli.class.php(80): Think\Db->initConnect(false)
#3 /www/wwwroot/www.timelessdeco.com/ThinkPHP/Library/Think/Db/Driver/Mysqli.class.php(209): Think\Db\Driver\Mysqli->query('SHOW COLUMNS FR...')
#4 /www/wwwroot/www.timelessdeco.com/ThinkPHP/Library/Think/Model.class.php(130): Think\Db\Driver\Mysqli->getFields('taide_category_...')
#5 /www/wwwroot/www.timelessdeco.com/ThinkPHP/Library/Think/Model.class.php(118): Think\Model->flush()
#6 /www/wwwroot/www.timelessdeco.com/ThinkPHP/Library/Think/Model.class.php(1298): Think\Model->_checkTableInfo()
#7 /www/wwwroot/www.timelessdeco.com/ThinkPHP/Library/Think/Model.class.php(95): Think\Model->db(0, '', true)
#8 /www/wwwroot/www.timelessdeco.com/ThinkPHP/Common/functions.php(554): Think\Model->__construct('category_produc...', '', '')
#9 /www/wwwroot/www.timelessdeco.com/Application/Home/Common/function.php(34): M('category_produc...')
#10 /www/wwwroot/www.timelessdeco.com/Application/Home/Controller/NewsController.class.php(7): product_nav_tree(0)
#11 /www/wwwroot/www.timelessdeco.com/ThinkPHP/Common/functions.php(613): Home\Controller\NewsController->__construct()
#12 /www/wwwroot/www.timelessdeco.com/ThinkPHP/Library/Think/App.class.php(80): controller('News', '')
#13 /www/wwwroot/www.timelessdeco.com/ThinkPHP/Library/Think/App.class.php(193): Think\App::exec()
#14 /www/wwwroot/www.timelessdeco.com/ThinkPHP/Library/Think/Think.class.php(120): Think\App::run()
#15 /www/wwwroot/www.timelessdeco.com/ThinkPHP/ThinkPHP.php(96): Think\Think::start()
#16 /www/wwwroot/www.timelessdeco.com/index.php(24): require('/www/wwwroot/ww...')
#17 {main}