public function search($params)

    {

        $query = SvnManage::find()->addOrderBy([

            'created_at' => SORT_DESC   // 自定义按创建时间倒序排序

        ]);

        // add conditions that should always apply here

        $dataProvider = new ActiveDataProvider([

            'query' => $query,

            'sort' => false,    // 去掉自动排序功能

        ]);