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thinkphp 无线级别分类


name          id    parent_id   path

 新闻          1        0         0

 中国新闻      2        1         0-1

   河北新闻    3        2         0-1-2

      保定新闻                     0-1-2-3

 美国新闻      4        1         0-1

   纽约新闻    5        4         0-1-4

      华尔街新闻6       5         0-1-4-5

 俄罗斯新闻    7        1         0-1

 

数据库字段

mysql> select * from news;

+---------+-----------+------+---------+

| news_id | news_name | pid  | path    |

+---------+-----------+------+---------+

|       1 | 新闻      |    0 | 0       |

|       2 | 中国新闻  |    1 | 0-1     |

|       3 | 美国新闻  |    1 | 0-1     |

|       4 | 河北新闻  |    2 | 0-1-2   |

|       5 | 纽约新闻  |    3 | 0-1-3   |

|       6 | 邯郸新闻  |    4 | 0-1-2-4 |

+---------+-----------+------+---------+

6 rows in set (0.00 sec)

以无线级别的思想查看数据库

mysql> select news_id,news_name,pid,path,concat(path,'-',news_id) as bpath from

news order by bpath;

+---------+-----------+------+---------+-----------+

| news_id | news_name | pid  | path    | bpath     |

+---------+-----------+------+---------+-----------+

|       1 | 新闻      |    0 | 0       | 0-1       |

|       2 | 中国新闻  |    1 | 0-1     | 0-1-2     |

|       4 | 河北新闻  |    2 | 0-1-2   | 0-1-2-4   |

|       6 | 邯郸新闻  |    4 | 0-1-2-4 | 0-1-2-4-6 |

|       3 | 美国新闻  |    1 | 0-1     | 0-1-3     |

|       5 | 纽约新闻  |    3 | 0-1-3   | 0-1-3-5   |

+---------+-----------+------+---------+-----------+

6 rows in set (0.04 sec)

News_id 自增

Pid :当前的pid是,父级news_id,

 

Path:当前的path是父级的path连上父级的news_id

bPath:当前的bpath是当前的path字段加上当前的news_id字段,他是一个临时的字段,这样就可以排序bpath,就可以达到一级一级的浏览的效果

concat()函数的参数是字符串列表,返回结果是 链接参数产生的字符串

 

 

在TP框架中

CategoryAction.class.php

class CategoryAction extends Action{
 public function shows(){
header('Content-Type:text/html;charset=utf8');
  $model=D('News');
  $list=$model->field("news_id,news_name,pid,path,concat(path,'-',news_id) as bpath")->order('bpath')->select();//bPath字段是path字段加上news_id字段
  //var_dump($list);
  /*php中的foreach,添加count子段,在bpath字段中,新闻是2个数字(0,1),中国新闻是3个{0,1,2},美国新闻是3个{0,1,3},河北新闻是4个数字(0,1,2,4)...所以要把-横杠去掉计算bpath的个数,用explode把bpath的字符串分割成数组,在计算数字的长度,值就是count字段的内容,缩进的字符数*/
  foreach($list as $key=>$value){
   //没循环一次就增加一个count字段,值是由字符串分割数组的个数
   $list[$key]['count']=count(explode('-',$value['bpath']));//$list[$key]['count']添加一个临时count字段
   }
  $this->assign('list',$list);
  $this->display();
  }
 
 public function add(){
  $model=D('News');
  $data=array(
  'news_name'=>$_POST['uname'],
  'pid'=>$_POST['pid'],//新添加的父id应该是点击当前option的id,也就是value="{$vo.news_id}",获得表单

 


?>

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