关于thinkphp查询以及分页的有关问题

关于thinkphp查询以及分页的问题
控制器里面的search方法：

	public function search(){

		import("@.ORG.Page");

		$list = D('Blog');

		$keyword = trim($this->_post('keyword','htmlspecialchars'));

		$sql = "SELECT b.*, a.`content`, u.`username`

			FROM blog b

			LEFT JOIN blog_attribute a ON a.`blog_id`=b.`id`

			LEFT JOIN user u ON u.`id`=b.`user_id`

			";

		if(!empty($keyword)){

			$sql .= " WHERE b.`title` LIKE '%{$keyword}%' OR a.`content` LIKE '%{$keyword}%'";

		}

		$count = count($list->query($sql));

		$Page = new Page($count,2);

		$firstRow = $Page->firstRow;

		$listRows = $Page->listRows;

		$this->data = $list->searchBlog($sql,$firstRow,$listRows);

		$xxx['data'] = $this->data;

		$page = $Page->show();

		$xxx['page'] = $page;

		//$this->data['page'] = $page;

		//$this->assign("page",$page);

		//var_dump(urldecode(json_encode($this->data)));

		$this->show(urldecode(json_encode($xxx)));

	}

列表页的代码：