yii 打印SQL

•         echo Location::find()
              ->where(['user_id' => $user_id])
              ->andWhere(['and', ['>', 'location_update_time', $time], ['<', 'location_update_time', $time+86400]])
              ->andWhere(['<>', 'location_name', ''])
              ->groupBy('location_name')
              ->having("count('location_name')>30")
              ->orderBy('location_update_time desc')
              ->limit(50)
              ->createCommand()
              ->getRawSql();