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 <div class="section" id="news-section">
<h1>News section<a class="headerlink" href="#news-section" title="Permalink to this headline">¶</a></h1>
In the last section, we went over some basic concepts of the framework
by writing a class that includes static pages. We cleaned up the URI by
adding custom routing rules. Now it’s time to introduce dynamic content
and start using a database.
<div class="section" id="setting-up-your-model">
<h2>Setting up your model<a class="headerlink" href="#setting-up-your-model" title="Permalink to this headline">¶</a></h2>
Instead of writing database operations right in the controller, queries
should be placed in a model, so they can easily be reused later. Models
are the place where you retrieve, insert, and update information in your
database or other data stores. They represent your data.
Open up the application/models/ directory and create a new file called
News_model.php and add the following code. Make sure you’ve configured
your database properly as described <a class="reference internal" href="../database/configuration.html">here</a>.
<div class="highlight-ci"><div class="highlight"><pre>&lt;?php
class News_model extends CI_Model {

public function __construct()
 {
 $this-&gt;load-&gt;database();
 }
}
</pre></div>
</div>
This code looks similar to the controller code that was used earlier. It
creates a new model by extending <code class="docutils literal">CI_Model</code> and loads the database
library. This will make the database class available through the
<code class="docutils literal">$this-&gt;db</code> object.
Before querying the database, a database schema has to be created.
Connect to your database and run the SQL command below (MySQL).
Also add some seed records.
<div class="highlight-ci"><div class="highlight"><pre>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)
);
</pre></div>
</div>
Now that the database and a model have been set up, you’ll need a method
to get all of our posts from our database. To do this, the database
abstraction layer that is included with CodeIgniter —
<a class="reference internal" href="../database/query_builder.html">Query Builder</a> — is used. This makes it
possible to write your ‘queries’ once and make them work on <a class="reference internal" href="../general/requirements.html">all
supported database systems</a>. Add the
following code to your model.
<div class="highlight-ci"><div class="highlight"><pre>public function get_news($slug = FALSE)
{
 if ($slug === FALSE)
 {
 $query = $this-&gt;db-&gt;get(&#39;news&#39;);
 return $query-&gt;result_array();
 }

$query = $this-&gt;db-&gt;get_where(&#39;news&#39;, array(&#39;slug&#39; =&gt; $slug));
 return $query-&gt;row_array();
}
</pre></div>
</div>
With this code you can perform two different queries. You can get all
news records, or get a news item by its <a class="reference external" href="#">slug</a>. You might have
noticed that the <code class="docutils literal">$slug</code> variable wasn’t sanitized before running the
query; <a class="reference internal" href="../database/query_builder.html">Query Builder</a> does this for you.
</div>
<div class="section" id="display-the-news">
<h2>Display the news<a class="headerlink" href="#display-the-news" title="Permalink to this headline">¶</a></h2>
Now that the queries are written, the model should be tied to the views
that are going to display the news items to the user. This could be done
in our <code class="docutils literal">Pages</code> controller created earlier, but for the sake of clarity,
a new <code class="docutils literal">News</code> controller is defined. Create the new controller at
application/controllers/News.php.
<div class="highlight-ci"><div class="highlight"><pre>&lt;?php
class News extends CI_Controller {

public function index()
 {
 $data[&#39;news&#39;] = $this-&gt;news_model-&gt;get_news();
 }

public function view($slug = NULL)
 {
 $data[&#39;news_item&#39;] = $this-&gt;news_model-&gt;get_news($slug);
 }
}
</pre></div>
</div>
Looking at the code, you may see some similarity with the files we
created earlier. First, the <code class="docutils literal">__construct()</code> method: it calls the
constructor of its parent class (<code class="docutils literal">CI_Controller</code>) and loads the model,
so it can be used in all other methods in this controller.
It also loads a collection of <a class="reference internal" href="../helpers/url_helper.html">URL Helper</a>
functions, because we’ll use one of them in a view later.
Next, there are two methods to view all news items and one for a specific
news item. You can see that the <code class="docutils literal">$slug</code> variable is passed to the model’s
method in the second method. The model is using this slug to identify the
news item to be returned.
Now the data is retrieved by the controller through our model, but
nothing is displayed yet. The next thing to do is passing this data to
the views.
<div class="highlight-ci"><div class="highlight"><pre>public function index()
{
 $data[&#39;news&#39;] = $this-&gt;news_model-&gt;get_news();
 $data[&#39;title&#39;] = &#39;News archive&#39;;

&lt;?php foreach ($news as $news_item): ?&gt;

&lt;h3&gt;&lt;?php echo $news_item[&#39;title&#39;]; ?&gt;&lt;/h3&gt;
 &lt;div class=&quot;main&quot;&gt;
 &lt;?php echo $news_item[&#39;text&#39;]; ?&gt;
 &lt;/div&gt;
 &lt;p&gt;&lt;a href=&quot;&lt;?php echo site_url(&#39;news/&#39;.$news_item[&#39;slug&#39;]); ?&gt;&quot;&gt;View article&lt;/a&gt;&lt;/p&gt;

&lt;?php endforeach; ?&gt;
</pre></div>
</div>
Here, each news item is looped and displayed to the user. You can see we
wrote our template in PHP mixed with HTML. If you prefer to use a template
language, you can use CodeIgniter’s <a class="reference internal" href="../libraries/parser.html">Template
Parser</a> class or a third party parser.
The news overview page is now done, but a page to display individual
news items is still absent. The model created earlier is made in such
way that it can easily be used for this functionality. You only need to
add some code to the controller and create a new view. Go back to the
<code class="docutils literal">News</code> controller and update <code class="docutils literal">view()</code> with the following:
<div class="highlight-ci"><div class="highlight"><pre>public function view($slug = NULL)
{
 $data[&#39;news_item&#39;] = $this-&gt;news_model-&gt;get_news($slug);

if (empty($data[&#39;news_item&#39;]))
 {
 show_404();
 }

$data[&#39;title&#39;] = $data[&#39;news_item&#39;][&#39;title&#39;];

$this-&gt;load-&gt;view(&#39;templates/header&#39;, $data);
 $this-&gt;load-&gt;view(&#39;news/view&#39;, $data);
 $this-&gt;load-&gt;view(&#39;templates/footer&#39;);
}
</pre></div>
</div>
Instead of calling the <code class="docutils literal">get_news()</code> method without a parameter, the
<code class="docutils literal">$slug</code> variable is passed, so it will return the specific news item.
The only things left to do is create the corresponding view at
application/views/news/view.php. Put the following code in this file.
<div class="highlight-ci"><div class="highlight"><pre>&lt;?php
echo &#39;&lt;h2&gt;&#39;.$news_item[&#39;title&#39;].&#39;&lt;/h2&gt;&#39;;
echo $news_item[&#39;text&#39;];
</pre></div>
</div>
</div>
<div class="section" id="routing">
<h2>Routing<a class="headerlink" href="#routing" title="Permalink to this headline">¶</a></h2>
Because of the wildcard routing rule created earlier, you need an extra
route to view the controller that you just made. Modify your routing file
(application/config/routes.php) so it looks as follows.
This makes sure the requests reaches the <code class="docutils literal">News</code> controller instead of
going directly to the <code class="docutils literal">Pages</code> controller. The first line routes URI’s
with a slug to the <code class="docutils literal">view()</code> method in the <code class="docutils literal">News</code> controller.
<div class="highlight-ci"><div class="highlight"><pre>$route[&#39;news/(:any)&#39;] = &#39;news/view/$1&#39;;
$route[&#39;news&#39;] = &#39;news&#39;;
$route[&#39;(:any)&#39;] = &#39;pages/view/$1&#39;;
$route[&#39;default_controller&#39;] = &#39;pages/view&#39;;
</pre></div>
</div>
Point your browser to your document root, followed by index.php/news and
watch your news page.
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