PHP简易新闻系统

Models部分负责读取或写入数据库

<?php
class News_model extends CI_Model {

    public function __construct()
    {
        //加载数据库，后面就可以用$this->db
        $this->load->database();
    }

    public function get_new_by_id($id)
    {
        $query = $this->db->get_where('news', array('id' => $id));
        //获取指定数目的新闻
        return $query->row_array();
    }

    public function get_news($slug = FALSE)
    {
        if ($slug === FALSE)
        {
            $query = $this->db->get('news');
            //获取所有的新闻条目
            return $query->result_array();
        }

        $query = $this->db->get_where('news', array('slug' => $slug));
        //获取指定数目的新闻
        return $query->row_array();
    }

    public function set_news()
    {
        //加载url辅助函数
        $this->load->helper('url');
        //使用辅助函数，使用"abc def"的title转变成abc-def，在数据库中可以看到
        //获取表单提交的数据,可以看到slug就是对标题处理后的结果
        $slug = url_title($this->input->post('title'), 'dash', TRUE);

        //创建一个数组
        $data = array(
            'title' => $this->input->post('title'),
            'slug' => $slug,
            'text' => $this->input->post('text')
        );
        //插入到数据库中
        return $this->db->insert('news', $data);
    }
}

Views部分的PHP脚本负责动态生成html页面

views/news/index.php，生成所有新闻 

 1 <!--从$news中取出新闻条目，存放在$news_item中 -->
 2 <?php foreach ($news as $news_item): ?>
 3     <!-- 取出标题-->
 4     <h3><?php echo $news_item['title']; ?></h3>
 5     <!-- 取出文本 -->
 6     <div class="main">
 7         <?php echo $news_item['text']; ?>
 8     </div>
 9     <!-- 将产生http://localhost/CodeIgniter/index.php/news/www-good
10     经由路由规则，将会调用News控制器的view方法，并把www-good作为参数传递进去，参看News.php的view方法
11     会生成一个新网页
12     -->
13     <p><a href="<?php echo site_url('news/'.$news_item['id']); ?>">View article</a></p>
14 
15 <?php endforeach; ?>

views/news/create.php

 1 <h2><?php echo $title; ?></h2>
 2 
 3 <?php echo validation_errors(); ?>
 4 
 5 <?php echo form_open('news/create'); ?>
 6 
 7     <label for="title">Title</label>
 8     <input type="input" name="title" /><br />
 9 
10     <label for="text">Text</label>
11     <textarea name="text"></textarea><br />
12 
13     <input type="submit" name="submit" value="Create news item" />
14 
15 </form>

views/news/view.php，生成新闻内容

1 <?php
2 echo $news_item['text'];

views/templates/header.php,负责生成页面开头某一部分

1 <html>
2     <head>
3         <title>CodeIgniter Tutorial</title>
4     </head>
5     <body>
6 
7         <h1><?php echo $title; ?></h1>

 

views/templates/footer.php，负责生成页页结尾某一部分

1     </body>
2 </html>

News控制器负责根据URL参数来调用Models和Views，最终完成数据库存取和页面生成

如：http://localhost/codeigniter/news/views/6

这个URL访问，将调用news控制器的viewx方法，并传入参数6

 1 <?php
 2 class News extends CI_Controller {
 3 
 4     public function __construct()
 5     {
 6         //调用父类的构造函数
 7         parent::__construct();
 8         //加载模型, 下面的create函数会用到
 9         $this->load->model('news_model');
10         //加载URL
11         $this->load->helper('url_helper');
12     }
13 
14     public function index()
15     {
16         //从模型中获取所有的新闻条目, $data数组在模型中创建
17         $data['news'] = $this->news_model->get_news();
18         //页面标题
19         $data['title'] = 'News archive';
20         //加载页头, header.php会访问$data中的$title元素
21         $this->load->view('templates/header', $data);
22         //加载主视图,index.php会访问$data数组中的$news元素，并显示$news中的所有新闻
23         $this->load->view('news/index', $data);
24         //加载页脚
25         $this->load->view('templates/footer');
26 
27     }
28     //id, title, slug, text
29     public function view($slug = NULL)
30     {
31         //获取指定条目的新闻
32         /*
33         $data['news_item'] = $this->news_model->get_news($slug);
34 
35         if (empty($data['news_item']))
36         {
37             show_404();
38         }
39 
40         $data['title'] = $data['news_item']['title'];
41 
42         $this->load->view('templates/header', $data);
43         $this->load->view('news/view', $data);
44         $this->load->view('templates/footer');
45         */
46         $data['news_item'] = $this->news_model->get_new_by_id($slug);
47 
48         if (empty($data['news_item']))
49         {
50             show_404();
51         }
52 
53         $data['title'] = $data['news_item']['title'];
54 
55         $this->load->view('templates/header', $data);
56         $this->load->view('news/view', $data);
57         $this->load->view('templates/footer');
58     }
59 
60     public function create()
61     {
62         $this->load->helper('form');
63         $this->load->library('form_validation');
64 
65         $data['title'] = 'Create a news item';
66 
67         $this->form_validation->set_rules('title', 'Title', 'required');
68         $this->form_validation->set_rules('text', 'Text', 'required');
69 
70         if ($this->form_validation->run() === FALSE)
71         {
72             //页头会从$data中取出$title数据
73             $this->load->view('templates/header', $data);
74             $this->load->view('news/create');
75             $this->load->view('templates/footer');
76 
77         }
78         else
79         {
80             $this->news_model->set_news();
81             $this->load->view('news/success');
82         }
83     }
84 }

 

posted @ 2017-06-27 11:26  WebNewer  阅读(439)  评论(0)  编辑  收藏  举报