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)
);<getting started with php framework codeigniter tutorialpre>
新建个表。注意text类型的选utf8编码，然后随便插入两条数据。
<p> <getting started with php framework codeigniter tutorialp>
<p>在models文件夹下新建News_model：<getting started with php framework codeigniter tutorialp>
<p> <getting started with php framework codeigniter tutorialp>
<pre class="code">
 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();
    }
}<getting started with php framework codeigniter tutorialpre>
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
<p> <getting started with php framework codeigniter tutorialp>
<h1>二新建Controller<getting started with php framework codeigniter tutorialh1>
<p>News.php<getting started with php framework codeigniter tutorialp>
<p> <getting started with php framework codeigniter tutorialp>
<pre class="code">
 load->model(news_model);
        $this->load->helper('url_helper');
    }

    Getting Started with PHP Framework CodeIgniter (2)_PHP Tutorial**
     * 显示所有新闻
     *Getting Started with PHP Framework CodeIgniter (2)_PHP Tutorial
    public function index(){
        $data['news'] = $this->news_model->get_news();
        $data['title'] = 'News archive';
        $this->load->view('templatesGetting Started with PHP Framework CodeIgniter (2)_PHP Tutorialheader', $data);
        $this->load->view('newsGetting Started with PHP Framework CodeIgniter (2)_PHP Tutorialindex', $data);
        $this->load->view('templatesGetting Started with PHP Framework CodeIgniter (2)_PHP Tutorialfooter');
    }

    Getting Started with PHP Framework CodeIgniter (2)_PHP Tutorial**
     * 显示某一个slug的新闻
     * @param null $slug
     *Getting Started with PHP Framework CodeIgniter (2)_PHP Tutorial
    public function view($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('templatesGetting Started with PHP Framework CodeIgniter (2)_PHP Tutorialheader', $data);
        $this->load->view('newsGetting Started with PHP Framework CodeIgniter (2)_PHP Tutorialview', $data);
        $this->load->view('templatesGetting Started with PHP Framework CodeIgniter (2)_PHP Tutorialfooter');
    }

}<getting started with php framework codeigniter tutorialpre>
注意：
<p> <getting started with php framework codeigniter tutorialp>
<p>1，Controller如何加载Model？<getting started with php framework codeigniter tutorialp>
<p>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$this->news_model进行调用。<getting started with php framework codeigniter tutorialp>
<p>2，Model的名字是不区分大小写的，即真正的model可以大写，在load的时候可以写成小写。<getting started with php framework codeigniter tutorialp>
<p>3,Controller如何跟view层发生关系？<getting started with php framework codeigniter tutorialp>
<p>通过$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。<getting started with php framework codeigniter tutorialp>
<p>4，通过代码可以看到，News这个控制器加载了viewGetting Started with PHP Framework CodeIgniter (2)_PHP Tutorialnews文件夹下的index.php 和view.php<getting started with php framework codeigniter tutorialp>
<h1>三，新建index.php<getting started with php framework codeigniter tutorialh1>
<p> <getting started with php framework codeigniter tutorialp>
<pre class="code">
<getting started with php framework codeigniter tutorialpre>
<h2> <getting started with php framework codeigniter tutorialh2>
 
<h3> <getting started with php framework codeigniter tutorialh3>
<div class="main"> <getting started with php framework codeigniter tutorialdiv>
<p>>View article<getting started with php framework codeigniter tutorialp>
 注意：此处用了site_url设置超链接，用意是地址栏里输入newsGetting Started with PHP Framework CodeIgniter (2)_PHP Tutorialslug能直接跳转到newsGetting Started with PHP Framework CodeIgniter (2)_PHP TutorialviewGetting Started with PHP Framework CodeIgniter (2)_PHP Tutorialslug，因此要设置路由。
<p> <getting started with php framework codeigniter tutorialp>
<p> <getting started with php framework codeigniter tutorialp>
<p>view.php<getting started with php framework codeigniter tutorialp>
<p> <getting started with php framework codeigniter tutorialp>
<pre class="code">
 '.$news_item['title'].'';
echo $news_item['text'];
<getting started with php framework codeigniter tutorialpre>
<brgetting started with php framework codeigniter tutorial>
<h1>四，修改routes.php<getting started with php framework codeigniter tutorialh1>
<p> <getting started with php framework codeigniter tutorialp>
<p>在原来基础上，增加以下两句：<getting started with php framework codeigniter tutorialp>
<p> <getting started with php framework codeigniter tutorialp>
<pre class="code">
$route['news'] = 'news';
$route['newsGetting Started with PHP Framework CodeIgniter (2)_PHP Tutorial(:any)'] = 'newsGetting Started with PHP Framework CodeIgniter (2)_PHP TutorialviewGetting Started with PHP Framework CodeIgniter (2)_PHP Tutorial$1';<getting started with php framework codeigniter tutorialpre>
<brgetting started with php framework codeigniter tutorial>
<p> <getting started with php framework codeigniter tutorialp>
<h1>五，配置数据库<getting started with php framework codeigniter tutorialh1>
<p>在database.php里配置下数据库相关信息。<getting started with php framework codeigniter tutorialp>
<p>经过以上5步，一切ok。<getting started with php framework codeigniter tutorialp>
<p>浏览器输入：http:Getting Started with PHP Framework CodeIgniter (2)_PHP TutorialGetting Started with PHP Framework CodeIgniter (2)_PHP TutoriallocalhostGetting Started with PHP Framework CodeIgniter (2)_PHP Tutorial~yanziGetting Started with PHP Framework CodeIgniter (2)_PHP TutorialCodeIgniterGetting Started with PHP Framework CodeIgniter (2)_PHP Tutorialindex.phpGetting Started with PHP Framework CodeIgniter (2)_PHP Tutorialnews<getting started with php framework codeigniter tutorialp>
<p><img alt="Getting Started with PHP Framework CodeIgniter (2)_PHP Tutorial" src="http:Getting%20Started%20with%20PHP%20Framework%20CodeIgniter%20(2)_PHP%20TutorialGetting%20Started%20with%20PHP%20Framework%20CodeIgniter%20(2)_PHP%20Tutorialwww.bkjia.comGetting%20Started%20with%20PHP%20Framework%20CodeIgniter%20(2)_PHP%20TutorialuploadsGetting%20Started%20with%20PHP%20Framework%20CodeIgniter%20(2)_PHP%20TutorialallimgGetting%20Started%20with%20PHP%20Framework%20CodeIgniter%20(2)_PHP%20Tutorial151029Getting%20Started%20with%20PHP%20Framework%20CodeIgniter%20(2)_PHP%20Tutorial041T0G52-0.png" getting started with php framework codeigniter tutorial><getting started with php framework codeigniter tutorialp>
<p> <getting started with php framework codeigniter tutorialp>
<p>点击超链接后http:Getting Started with PHP Framework CodeIgniter (2)_PHP TutorialGetting Started with PHP Framework CodeIgniter (2)_PHP TutoriallocalhostGetting Started with PHP Framework CodeIgniter (2)_PHP Tutorial~yanziGetting Started with PHP Framework CodeIgniter (2)_PHP TutorialCodeIgniterGetting Started with PHP Framework CodeIgniter (2)_PHP Tutorialindex.phpGetting Started with PHP Framework CodeIgniter (2)_PHP TutorialnewsGetting Started with PHP Framework CodeIgniter (2)_PHP Tutorialslug1111 转到以下：<getting started with php framework codeigniter tutorialp>
<p><img alt="Getting Started with PHP Framework CodeIgniter (2)_PHP Tutorial" src="http:Getting%20Started%20with%20PHP%20Framework%20CodeIgniter%20(2)_PHP%20TutorialGetting%20Started%20with%20PHP%20Framework%20CodeIgniter%20(2)_PHP%20Tutorialwww.bkjia.comGetting%20Started%20with%20PHP%20Framework%20CodeIgniter%20(2)_PHP%20TutorialuploadsGetting%20Started%20with%20PHP%20Framework%20CodeIgniter%20(2)_PHP%20TutorialallimgGetting%20Started%20with%20PHP%20Framework%20CodeIgniter%20(2)_PHP%20Tutorial151029Getting%20Started%20with%20PHP%20Framework%20CodeIgniter%20(2)_PHP%20Tutorial041T04Q3-1.png" getting started with php framework codeigniter tutorial><getting started with php framework codeigniter tutorialp>
<p> <getting started with php framework codeigniter tutorialp>
<p><brgetting started with php framework codeigniter tutorial>
 <getting started with php framework codeigniter tutorialp>
<p> <getting started with php framework codeigniter tutorialp>
<getting started with php framework codeigniter tutorialp>
<p align="left"></p>
<div style="display:none;"><span id="url" itemprop="url">http:Getting Started with PHP Framework CodeIgniter (2)_PHP TutorialGetting Started with PHP Framework CodeIgniter (2)_PHP Tutorialwww.bkjia.comGetting Started with PHP Framework CodeIgniter (2)_PHP TutorialPHPjcGetting Started with PHP Framework CodeIgniter (2)_PHP Tutorial1065223.html<getting started with php framework codeigniter tutorialspan><span id="indexUrl" itemprop="indexUrl">www.bkjia.com<getting started with php framework codeigniter tutorialspan><span id="isOriginal" itemprop="isOriginal">true<getting started with php framework codeigniter tutorialspan><span id="isBasedOnUrl" itemprop="isBasedOnUrl">http:Getting Started with PHP Framework CodeIgniter (2)_PHP TutorialGetting Started with PHP Framework CodeIgniter (2)_PHP Tutorialwww.bkjia.comGetting Started with PHP Framework CodeIgniter (2)_PHP TutorialPHPjcGetting Started with PHP Framework CodeIgniter (2)_PHP Tutorial1065223.html<getting started with php framework codeigniter tutorialspan><span id="genre" itemprop="genre">TechArticle<getting started with php framework codeigniter tutorialspan><span id="description" itemprop="description">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...<getting started with php framework codeigniter tutorialspan><getting started with php framework codeigniter tutorialdiv><getting started with php framework codeigniter tutorialp><getting started with php framework codeigniter tutorialdiv>
<div class="art_confoot"><getting started with php framework codeigniter tutorialdiv>
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