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

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

#0 /www/wwwroot/www.gywxs.com/ThinkPHP/Library/Think/Db/Driver.class.php(109): E('SQLSTATE[HY000]...')
#1 /www/wwwroot/www.gywxs.com/ThinkPHP/Library/Think/Db/Driver.class.php(1075): Think\Db\Driver->connect()
#2 /www/wwwroot/www.gywxs.com/ThinkPHP/Library/Think/Db/Driver/Mysql.class.php(47): Think\Db\Driver->initConnect(true)
#3 /www/wwwroot/www.gywxs.com/ThinkPHP/Library/Think/Model.class.php(134): Think\Db\Driver\Mysql->getFields('book_articles')
#4 /www/wwwroot/www.gywxs.com/ThinkPHP/Library/Think/Model.class.php(122): Think\Model->flush()
#5 /www/wwwroot/www.gywxs.com/ThinkPHP/Library/Think/Model.class.php(1454): Think\Model->_checkTableInfo()
#6 /www/wwwroot/www.gywxs.com/ThinkPHP/Library/Think/Model.class.php(97): Think\Model->db(0, '', true)
#7 /www/wwwroot/www.gywxs.com/ThinkPHP/Common/functions.php(621): Think\Model->__construct('articles', '', '')
#8 /www/wwwroot/www.gywxs.com/ThinkPHP/Library/Org/Util/Pick.class.php(13): M('articles')
#9 /www/wwwroot/www.gywxs.com/Application/Common/Common/extend.php(62): Org\Util\Pick->picklist(NULL, 'initialize')
#10 /www/wwwroot/www.gywxs.com/Application/Common/Cron/autopick.php(5): pickrun('list', NULL, 'index')
#11 /www/wwwroot/www.gywxs.com/ThinkPHP/Library/Behavior/CronRunBehavior.class.php(44): include('/www/wwwroot/ww...')
#12 /www/wwwroot/www.gywxs.com/ThinkPHP/Library/Think/Hook.class.php(119): Behavior\CronRunBehavior->run(NULL)
#13 /www/wwwroot/www.gywxs.com/ThinkPHP/Library/Think/Hook.class.php(89): Think\Hook::exec('Behavior\\CronRu...', 'run', NULL)
#14 /www/wwwroot/www.gywxs.com/ThinkPHP/Library/Think/App.class.php(206): Think\Hook::listen('app_end')
#15 /www/wwwroot/www.gywxs.com/ThinkPHP/Library/Think/Think.class.php(120): Think\App::run()
#16 /www/wwwroot/www.gywxs.com/ThinkPHP/ThinkPHP.php(97): Think\Think::start()
#17 /www/wwwroot/www.gywxs.com/index.php(4): require('/www/wwwroot/ww...')
#18 {main}