thinkphp实现数据分页

方法一：
 1 public function show_cate(){
 2         
 3         $category_name = array(
 4             '1' => '政法综治前沿',
 5             '2' => '政策法规',
 6             '3' => '平安建设',
 7             '4' => '通知公告',
 8             '5' => '理论研讨',
 9             '6' => '本地动态',
10             '7' => '队伍建设',
11             );
12         $category_id = I('get.category_id');
13         $model = M('zx_article');
14                                  //计算要显示的总数据条数
15         $count = $model->where('category_id ='.$category_id)->order('article_id desc')->count();
16                                 //实例化Page类，传入总条数和每页要显示的条数
17         $page = new ThinkPage($count,2);
18                               //使用limit函数指定查询和操作的数量
19         $data = $model->where('category_id ='.$category_id)->order('article_id desc')->limit($page->firstRow.','.$page->listRows)->select();
20                                 //传数据给模板
21         $this->assign('data',$data);
22                                //调用Page类的show()函数
23         $this->assign('page',$page->show());
24         $this->assign('name',$category_name[$category_id]);
25         $this->display();
26     }