public function actionIndex() {
        $criteria = new CDbCriteria(array(
                    'alias' => 't',
                    'condition' => 't.status=' . Blog::STATUS_PUBLISHED,
                    'order' => 't.sticky DESC, t.create_time DESC',
                    'select'=>'t.id, title, url, teaser, status, create_time, update_time, author_id, counter, forum_id'
        ));
        if (isset($_GET['q'])) {
            $criteria->condition .= ' and (t.title LIKE :keyword or t.teaser LIKE :keyword or t.content LIKE :keyword)';
            $criteria->params = array(':keyword'=>'%'.strtr(strtolower($_GET['q']),array('%'=>'\%', '_'=>'\_', '\\'=>'\\\\')).'%');
        }

        if (isset($_GET['tag'])) {
            $criteria->join .= ' right join tbl_blog_tags on t.id=tbl_blog_tags.blog_id right join tbl_tag on tbl_tag.id=tbl_blog_tags.tag_id';
            $criteria->condition .= ' and tbl_tag.name=:tag';
            $criteria->params = array(':tag'=>$_GET['tag']);
        }


        $dataProvider = new CActiveDataProvider('Blog', array(
                    'pagination' => array(
                        'pageSize' => Yii::app()->params['postsPerPage'],
                    ),
                    'criteria' => $criteria,
        ));

        $this->render('index', array(
            'dataProvider' => $dataProvider,
        ));
    }