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CodeIgniter 入门实践（新闻系统）

2017-10-11 13:10 344 查看

参考官方手册，最终修改内容作一总结。

加载静态内容

application/controllers目录下新建pages.php文件。

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Pages extends CI_Controller {
public function view($page = 'home')
{
if ( ! file_exists(APPPATH.'views/pages/'.$page.'.php'))
{
// Whoops, we don't have a page for that!
show_404();
}
$data['title'] = ucfirst($page); // Capitalize the first letter
$this->load->view('templates/header', $data);
$this->load->view('pages/'.$page, $data);
$this->load->view('templates/footer', $data);
}
}

views目录下新建目录pages和templates。

目录：views/pages/

文件：about.php home.php （这两个文件内容随意，暂不Care）

目录：views/templates/

文件：header.php footer.php

header.php

<html>
<head>
<title>CodeIgniter Tutorial</title>
</head>
<body>
<h1><?php echo $title; ?></h1>

footer.php

<em>© 2015</em>
</body>
</html>

浏览器输入地址：

http://localhost/index.php/pages/view

在文件application/config/routes.php中增加路由规则

$route['default_controller'] = 'pages/view';
$route['(:any)'] = 'pages/view/$1';

效果如图

读取新闻条目

在

application/models/

目录下新建文件

News model.php

，写入代码：

<?php
class News_model extends CI_Model {
public function __construct()
{
$this->load->database();
}

public function get_news($slug = FALSE)
{
if ($slug === FALSE)
{
$query = $this->db->get('news');
return $query->result_array();
}
$query = $this->db->get_where('news', array('slug' => $slug));
return $query->row_array();
}
}

连接数据库

CREATE TABLE news (
id int(11) NOT NULL AUTO_INCREMENT,
title varchar(128) NOT NULL,
slug varchar(128) NOT NULL,
text text NOT NULL,
PRIMARY KEY (id),
KEY slug (slug)
);

在

application/controllers/

目录下创建

News.php

加入代码

<?php
class News extends CI_Controller {
public function __construct()
{
parent::__construct();
4000

$this->load->model('news_model');
$this->load->helper('url_helper');
}
public function index()
{
$data['news'] = $this->news_model->get_news();
$data['title'] = 'News archive';
$this->load->view('templates/header', $data);
$this->load->view('news/index', $data);
$this->load->view('templates/footer');
}
public function view($slug = NULL)
{
$data['news_item'] = $this->news_model->get_news($slug);
if (empty($data['news_item']))
{
show_404();
}
$data['title'] = $data['news_item']['title'];
$this->load->view('templates/header', $data);
$this->load->view('news/view', $data);
$this->load->view('templates/footer');
}
}

在

application/views/

目录下新建

news/index.php

文件，代码如下：

<h2><?php echo $title; ?></h2>
<?php foreach ($news as $news_item): ?>
<h3><?php echo $news_item['title']; ?></h3>
<div class="main">
<?php echo $news_item['text']; ?>
</div>
<p><a href="<?php echo site_url('news/'.$news_item['slug']); ?>">View article</a></p>
<?php endforeach; ?>

在目录

application/views/news/

下创建文件

view.php

，写入代码

<?php
echo '<h2>'.$news_item['title'].'</h2>';
echo $news_item['text'];

在文件

application/config/routes.php

中增加路由规则

$route['news/(:any)'] = 'news/view/$1';
$route['news'] = 'news';
$route['(:any)'] = 'pages/view/$1';
$route['default_controller'] = 'pages/view';

出错

404 Page Not Found

The page you requested was not found.

调整路由表文件

application/config/routes.php

：

$route['default_controller'] = 'welcome';
$route['404_override'] = '';
$route['translate_uri_dashes'] = FALSE;

$route['news/(:any)'] = 'news/view/$1';
$route['news'] = 'news';
$route['default_controller'] = 'pages/view';
$route['(:any)'] = 'pages/view/$1';

错误变为：

A PHP Error was encountered

Severity: Warning

Message: mysqli::real_connect(): (HY000/1045): Access denied for user ''@'localhost' (using password: NO)

Filename: mysqli/mysqli_driver.php

Line Number: 201

Backtrace:

File: D:\wamp64\www\application\models\News_model.php
Line: 5
Function: database

File: D:\wamp64\www\application\controllers\News.php
Line: 6
Function: model

File: D:\wamp64\www\index.php
Line: 315
Function: require_once

A Database Error Occurred

Unable to connect to your database server using the provided settings.

Filename: D:/wamp64/www/system/database/DB_driver.php

Line Number: 436

数据库的问题。那么，创建数据库和数据表。操作记录如下：

mysql> create database blog;
Query OK, 1 row affected (0.00 sec)

mysql> use blog
Database changed
mysql> CREATE TABLE news (
-> id int(11) NOT NULL AUTO_INCREMENT,
-> title varchar(128) NOT NULL,
-> slug varchar(128) NOT NULL,
-> text text NOT NULL,
-> PRIMARY KEY (id),
-> KEY slug (slug)
-> );
Query OK, 0 rows affected (0.02 sec)

配置后，问题并没有解决。

修改数据库配置文件

/application/config/database.php

，配置参数：

'dsn'   => '',
'hostname' => 'localhost',
'username' => 'root',
'password' => '@yixzm',
'database' => 'blog',
'dbdriver' => 'mysqli',

效果如图

创建新闻条目，即写数据

在文件

application/views/news/create.php

中创建一个新视

图。

<h2><?php echo $title; ?></h2>
<?php echo validation_errors(); ?>
<?php echo form_open('news/create'); ?>
<label for="title">Title</label>
<input type="input" name="title" /><br />
<label for="text">Text</label>
<textarea name="text"></textarea><br />
<input type="submit" name="submit" value="Create news item" />
</form>

application/controllers/News.php

中，增加function。

public function create()
{
$this->load->helper('form');
$this->load->library('form_validation');
$data['title'] = 'Create a news item';
$this->form_validation->set_rules('title', 'Title', 'required');
$this->form_validation->set_rules('text', 'Text', 'required');
if ($this->form_validation->run() === FALSE)
{
$this->load->view('templates/header', $data);
$this->load->view('news/create');
$this->load->view('templates/footer');
}
else
{
$this->news_model->set_news();
$this->load->view('news/success');
}
}

application/models/News model.php

增加代码

public function set_news()
{
$this->load->helper('url');
$slug = url_title($this->input->post('title'), 'dash', TRUE);
$data = array(
'title' => $this->input->post('title'),
'slug' => $slug,
'text' => $this->input->post('text')
);
return $this->db->insert('news', $data);
}

调整路由表文件

application/config/routes.php

：

$route['news/create'] = 'news/create';
$route['news/(:any)'] = 'news/view/$1';
$route['news'] = 'news';
$route['(:any)'] = 'pages/view/$1';
$route['default_controller'] = 'pages/view';

打开创建页面，写入信息

提交报错：

An Error Was Encountered Unable to load the requested file:

news/success.php

在

/applications/views/news/

目录下创建

success.php

，用于反馈用户信息提交成功。

返news界面（

/http://localhost/index.php/news/

），可以看到效果：

至此，小新闻系统测试成功。耶！

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标签： codeigniter 新闻

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