yii charset不好用

        $connection = new CDbConnection('mysql:host=localhost;dbname=control', 'root', '123456');

        #不好使        

        //$connection = new CDbConnection('mysql:host=localhost;charset=utf8;dbname=control', 'root', '123456');

        $connection->active = true;

        #下面这句不好使，改了全局的framework/db/CDbConnection.php 

        #$connection->charset = 'utf8';

最终修改framework/db/CDbConnection.php下的

    public $charset='utf8'; 

ok了