无法记录数据库日志 [ 1.1 版本 ]

配置如下
db.php

'db'=>array(
	'class'=>'CDbConnection',
	'connectionString' => 'mysql:host=xxx.xxx.xxx.xxx;dbname=xxx',
	'emulatePrepare' => true,
	'username' => 'xxx',
	'password' => 'xxx',
	'charset' => 'utf8',
	'tablePrefix'=>'ins_',
	'enableProfiling'=>true,
	'enableParamLogging'=>true,
),

params.php

'log' => array(
    'class' => 'CLogRouter',
    'routes' => array(

        array(
            'class'      => 'CFileLogRoute',
            'levels'     => 'info,trace,warning,error',
            'categories' => 'application',
        ),
        //php结果输出
        array(
            'class'      => 'CFileLogRoute',
            'levels'     => 'trace',
            'categories' => 'php.*',
            'logFile'    => 'php.echo',
        ),
        array(
            'class'      => 'CFileLogRoute',
            'levels'     => 'warning',
            'categories' => 'php.warning.*',
            'logFile'    => 'php.echo.warning',
        ),
        array(
            'class'      => 'CFileLogRoute',
            'levels'     => 'error',
            'categories' => 'api.error.*',
            'logFile'    => 'api.error.log',
        ),
        array(
            'class'      => 'CFileLogRoute',
            'levels'     => 'info',
            'categories' => 'api.info.*',
            'logFile'    => 'api.info.log',
        ),
        array(
            'class'      => 'CFileLogRoute',
            'levels'     => 'info',
            'categories' => 'push.info.*',
            'logFile'    => 'push.info.log',
        ),
        array(
            'class'      => 'CFileLogRoute',
            'levels'     => 'info,trace,warning,error',
            'categories' => 'php.pay.*',
            'logFile'    => 'php.pay.log',
        ),
        array(
            'class' => 'CFileLogRoute',
            'enabled' => true,
            'categories' => 'system.db.*',
            'levels' => 'trace,error,warning,info',
            'filter' => array(
                'class' => 'CLogFilter',
                'logUser' => true,
                'prefixUser' => true,
            ),
            'logFile' => 'db.log',
        ),
    ),
),