mysql连接不上Uncaught exception 'PDOException' with message 'could not find driver
需要给你的PHP加一个PDO扩展打开PHP.INI 把extension=php_pdo.dll 前面的分号去掉 重启APACHE。extension=php_pdo_mysql.dll ...
原文：Exception: Could not find a default OpenFlow controller
Exception: Could not find a default OpenFlow controller sudo apt get install openvswitch testcontroller sudo ln usr bin ovs testcontroller usr bin controller ...
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