SQLSTATE[HY000] [2002] No such file or directory

FILE: /www/wwwroot/taixuew/ThinkPHP/Library/Think/Db/Driver.class.php 　LINE: 109

#0 /www/wwwroot/taixuew/ThinkPHP/Library/Think/Db/Driver.class.php(109): E('SQLSTATE[HY000]...')
#1 /www/wwwroot/taixuew/ThinkPHP/Library/Think/Db/Driver.class.php(1075): Think\Db\Driver->connect()
#2 /www/wwwroot/taixuew/ThinkPHP/Library/Think/Db/Driver/Mysql.class.php(47): Think\Db\Driver->initConnect(true)
#3 /www/wwwroot/taixuew/ThinkPHP/Library/Think/Model.class.php(134): Think\Db\Driver\Mysql->getFields('tarticle')
#4 /www/wwwroot/taixuew/ThinkPHP/Library/Think/Model.class.php(122): Think\Model->flush()
#5 /www/wwwroot/taixuew/ThinkPHP/Library/Think/Model.class.php(1454): Think\Model->_checkTableInfo()
#6 /www/wwwroot/taixuew/ThinkPHP/Library/Think/Model.class.php(97): Think\Model->db(0, '', true)
#7 /www/wwwroot/taixuew/ThinkPHP/Common/functions.php(596): Think\Model->__construct('tarticle')
#8 /www/wwwroot/taixuew/Application/Home/Controller/ArticleController.class.php(75): D('tarticle')
#9 [internal function]: Home\Controller\ArticleController->detail()
#10 /www/wwwroot/taixuew/ThinkPHP/Library/Think/App.class.php(173): ReflectionMethod->invoke(Object(Home\Controller\ArticleController))
#11 /www/wwwroot/taixuew/ThinkPHP/Library/Think/App.class.php(110): Think\App::invokeAction(Object(Home\Controller\ArticleController), 'detail')
#12 /www/wwwroot/taixuew/ThinkPHP/Library/Think/App.class.php(204): Think\App::exec()
#13 /www/wwwroot/taixuew/ThinkPHP/Library/Think/Think.class.php(120): Think\App::run()
#14 /www/wwwroot/taixuew/ThinkPHP/ThinkPHP.php(97): Think\Think::start()
#15 /www/wwwroot/taixuew/index.php(26): require('/www/wwwroot/ta...')
#16 {main}