Table of Contents
PHP框架CodeIgniter入门使用(2)
一,创建Model
二新建Controller
三,新建index.php
四,修改routes.php
五,配置数据库
Home php教程 php手册 PHP框架CodeIgniter入门使用(2)

PHP框架CodeIgniter入门使用(2)

Jun 13, 2016 am 08:52 AM
codeigniter php use getting Started frame Link

PHP框架CodeIgniter入门使用(2)

本文参考 链接 介绍CodeIgniter如何将Controller连接Model层(操作数据库),实现读取新闻条目功能。通过本文串通Controller和Model以及View之间如何协同,控制。

一,创建Model

有一点需要明确,关于数据库的操作在model层,而非Controller层,Controller只负责业务控制逻辑,从model里取数据然后送给view。phpmyadmin里:

 

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)
);
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新建个表。注意text类型的选utf8编码,然后随便插入两条数据。

在models文件夹下新建News_model:

 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();
    }
}
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注意上面result_array()是返回查询到所有的结果,row_array()是返回查询的当前那条结果。关于数据库的部分可以参考 链接

二新建Controller

News.php

 load->model(news_model);
        $this->load->helper('url_helper');
    }

    /**
     * 显示所有新闻
     */
    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');
    }

    /**
     * 显示某一个slug的新闻
     * @param null $slug
     */
    public function view($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');
    }

}
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注意:

1,Controller如何加载Model?

在News的构造函数里通过load->model('')里将model目录下对应名字的model加载进来,然后再使用时通过$this->news_model进行调用。

2,Model的名字是不区分大小写的,即真正的model可以大写,在load的时候可以写成小写。

3,Controller如何跟view层发生关系?

通过$this->load->view('')加载view文件夹下的文件,传递一个array。在Controller里的array的key,在view下就是对应的变量名字。关于传递数据这块可以参考 CI的模版解析类部分。

4,通过代码可以看到,News这个控制器加载了view/news文件夹下的index.php 和view.php

三,新建index.php

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>View article

注意:此处用了site_url设置超链接,用意是地址栏里输入news/slug能直接跳转到news/view/slug,因此要设置路由。

view.php

 '.$news_item['title'].'';
echo $news_item['text'];
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四,修改routes.php

在原来基础上,增加以下两句:

$route['news'] = 'news';
$route['news/(:any)'] = 'news/view/$1';
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五,配置数据库

在database.php里配置下数据库相关信息。

经过以上5步,一切ok。

浏览器输入:http://localhost/~yanzi/CodeIgniter/index.php/news

 

点击超链接后http://localhost/~yanzi/CodeIgniter/index.php/news/slug1111 转到以下:

 


 

 

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