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CodeIgniter 入门教程第一篇:信息发布,ci

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Release: 2016-06-13 08:56:25
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CodeIgniter 入门教程第一篇:信息发布,ci

一、MVC

    CodeIgniter 采用MVC架构即:控制层、模型层和视图层。

    对应Application下面的文件夹   (图1):

    所有新建文件以.php结尾

    视图层 view 文件夹放入HTML模板

    模型层 model 存放对数据库操作的代码

    控制层 controllers 存放进行逻辑判断的代码,从模型层取得数据然后输入到视图层,发送给用户。

    图1

 

功能

1. 模板增加输入表单

2. 控制器增加接收表单数据的代码,并对用户输入进行简单校验。

3. 在表单上方输出标题和正文,以及发布时间。

用到的知识点:CI helper类(url) 和 输入类(input),

以及CI ActiveRecord 和向模板传值。

 

二、初始配置

    1. 链接数据库

    修改数据库配置:/application/config/database.php

  'hostname' => 'localhost',
    'username' => 'root',
    'password' => '',
    'database' => 'test',
    'dbdriver' => 'mysqli',
    'dbprefix' => 'ts_',
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2. 修改默认路由

CI框架采用单文件入口的方式,默认必须通过index.php来访问控制层。比如controllers文件夹下有个名为test的class类,test有个叫home的function,

则访问URL为:http://www.example.com/index.php/test/home

三、输出页面

1. 直接输出HTML模板

新建两个文件分别位于controllers文件夹和views文件夹

Test.php

<?php

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

class Test extends CI_Controller {

    public function home()

    {

        $this->load->view('home');

    }

}

home.php

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

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Home</title>

</head>

<body>

    <h1>这是我们的主页</h1>

</body>

</html>
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在浏览器打开类似如下地址:http://test.com/index.php/test/home

2. 插入数据库条目

创建数据库表ts_news

Test.php

<?php

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

class Test extends CI_Controller {

public function __construct()

{

parent::__construct();

$this->load->helper('url');

$this->load->model('news_model');

}

public function home()

{

$this->load->view('home');

}

public function add_news(){

$title = $this->input->get('title',TRUE);

$content = $this->input->get('content');

if ( (strlen($title) < 20 ) or (strlen($content) < 20 ) ){

echo '标题或正文内容过短';

return false;

}

$arr = array(

'id' => '',

'title' => $title,

'content' => $content,

'update_time' => time(),

'create_time' => time()

);

$check = $this->news_model->insert($arr,'news');

if ($check)

{

redirect('test/home');

}

else

{

echo '提交失败';

}

}

}

home.php

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

<!DOCTYPE html>

<html lang="en">

<head>

<meta charset="UTF-8">

<title>Home</title>

</head>

<body>

<h1>这是我们的主页</h1>

<hr>

<form action="<?php echo site_url('test/add_news'); ?>">

<label for="title">标题</label>

<input type="text" name="title" value="">

<br>

<label for="content">正文</label>

<textarea name="content" id="" cols="30" rows="10"></textarea>

<br>

<input type="submit" value="提交" >

</form>

</body>

</html>

News_model.php

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

class News_model extends CI_Model {

public function __construct()

    {

        parent::__construct();

        $this->load->database();

    }

public function insert($arr,$table)

{

$this->db->insert($table, $arr);

        if ($this->db->affected_rows() > 0)

        {

            return $this->db->insert_id();

        }

        else

        {

            return FALSE;

        }

}

}

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    3. 查询数据库并输出

    News_model.php增加

public function get_all($table)

    {

        $this->db->select('*');

        $query = $this->db->get($table);

        $query = $query->result_array();

        return $query;

    }

Test.php 的 home修改为:

public function home()

    {

        $news = $this->news_model->get_all('news');

        $data['news'] = $news;

        $this->load->view('home',$data);

    }
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  Home模板的body修改为:

<body>

<h1>这是我们的主页</h1>

<?php 

foreach ($news as $key => $value) {

echo '<div>

<h3>'.$value['title'].'</h3>

<span>发布时间:'.date('Y-m-d H:i:s',$value['create_time']).'</span>

<p>'.$value['content'].'</p>

</div>';

}

?>

<hr>

<form action="<?php echo site_url('test/add_news'); ?>">

<label for="title">标题</label>

<input type="text" name="title" value="">

<br>

<label for="content">正文</label>

<textarea name="content" id="" cols="30" rows="10"></textarea>

<br>

<input type="submit" value="提交" >

</form>

</body>
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刷新查看效果:

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