CodeIgniter 入门教程第一篇：信息发布，ci
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_',
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 id="这是我们的主页">这是我们的主页</h1>
</body>
</html>
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 id="这是我们的主页">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 $this->db->insert_id();
}
else
{
return FALSE;
}
}
}
412ded80-4884-4a2f-ae37-6ba69cdc4278
493498ee-0f5c-4676-9cec-38e5a3f3e6fd
3. 查询数据库并输出
News_model.php增加
public function get_all($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);
}
Home模板的body修改为：
<body>
<h1 id="这是我们的主页">这是我们的主页</h1>
<?php
foreach ($news as $key => $value) {
echo '<div>
<h3 id="value-title">'.$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>
刷新查看效果：
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