哥，你这个成功了吗，我也遇到相同问题了，我这个也显示连不上数据库，我就配置了一个db，帐号密码也都没问题，这是什么情况啊，我main.php是这么写的
<?php

// uncomment the following to define a path alias
// Yii::setPathOfAlias('local','path/to/local-folder');

// This is the main Web application configuration. Any writable
// CWebApplication properties can be configured here.
return array(

'basePath' => dirname(__FILE__) . DIRECTORY_SEPARATOR . '..',
'name' => 'My Web Application',

// preloading 'log' component
'preload' => array('log'),

// autoloading model and component classes
'import' => array(
    'application.models.*',
    'application.components.*',
),

'modules' => array(
    // uncomment the following to enable the Gii tool
    'gii'=>array(
        'class'=>'system.gii.GiiModule',
        'password'=>'blog',
        // If removed, Gii defaults to localhost only. Edit carefully to taste.
        // 'ipFilters'=>array('127.0.0.1','::1'),
    ),
),

// application components
'components' => array(
    'user' => array(
        // enable cookie-based authentication
        'allowAutoLogin' => true,
    ),
    // uncomment the following to enable URLs in path-format
    /*
    'urlManager'=>array(
        'urlFormat'=>'path',
        'rules'=>array(
            '<controller:\w+>/<id:\d+>'=>'<controller>/view',
            '<controller:\w+>/<action:\w+>/<id:\d+>'=>'<controller>/<action>',
            '<controller:\w+>/<action:\w+>'=>'<controller>/<action>',
        ),
    ),
    */
    // uncomment the following to use a MySQL database
    'db' => array(
        'connectionString' => 'mysql:host=localhost;dbname=blog',
        'emulatePrepare' => true,
        'username' => 'root',
        'password' => 'root',
        'charset' => 'utf8',
        'tablePrefix' => 'tbl_',
    ),
    /*
	'db'=>array(
		'connectionString' => 'sqlite:'.dirname(__FILE__).'/../data/testdrive.db',
	),
	*/
    'errorHandler' => array(
        // use 'site/error' action to display errors
        'errorAction' => 'site/error',
    ),
    'log' => array(
        'class' => 'CLogRouter',
        'routes' => array(
            array(
                'class' => 'CFileLogRoute',
                'levels' => 'error, warning',
            ),
            // uncomment the following to show log messages on web pages
            /*
            array(
                'class'=>'CWebLogRoute',
            ),
            */
        ),
    ),
),

// application-level parameters that can be accessed
// using Yii::app()->params['paramName']
'params' => array(
    // this is used in contact page
    'adminEmail' => 'webmaster@example.com',
),

);