diff options
| author | Joël Cox <joel@joelcox.nl> | 2011-10-09 18:39:39 +0200 |
|---|---|---|
| committer | Joël Cox <joel@joelcox.nl> | 2011-10-09 18:39:39 +0200 |
| commit | f4fb1db458fab52d0493ead52c9ea7e01206eaa7 (patch) | |
| tree | c549600f342f4d3f0df75a2f2f7c265be0f1cc72 /user_guide/general/models.html | |
| parent | c4dd200c1155a118afa32cd91d9bd67bc243f83a (diff) | |
Moved tutorial to new user guide directory.
Diffstat (limited to 'user_guide/general/models.html')
| -rw-r--r-- | user_guide/general/models.html | 251 |
1 files changed, 0 insertions, 251 deletions
diff --git a/user_guide/general/models.html b/user_guide/general/models.html deleted file mode 100644 index 1696f424a..000000000 --- a/user_guide/general/models.html +++ /dev/null @@ -1,251 +0,0 @@ -<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> -<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> -<head> - -<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> -<title>Models : CodeIgniter User Guide</title> - -<style type='text/css' media='all'>@import url('../userguide.css');</style> -<link rel='stylesheet' type='text/css' media='all' href='../userguide.css' /> - -<script type="text/javascript" src="../nav/nav.js"></script> -<script type="text/javascript" src="../nav/prototype.lite.js"></script> -<script type="text/javascript" src="../nav/moo.fx.js"></script> -<script type="text/javascript" src="../nav/user_guide_menu.js"></script> - -<meta http-equiv='expires' content='-1' /> -<meta http-equiv= 'pragma' content='no-cache' /> -<meta name='robots' content='all' /> -<meta name='author' content='ExpressionEngine Dev Team' /> -<meta name='description' content='CodeIgniter User Guide' /> -</head> -<body> - -<!-- START NAVIGATION --> -<div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div> -<div id="nav2"><a name="top"></a><a href="javascript:void(0);" onclick="myHeight.toggle();"><img src="../images/nav_toggle_darker.jpg" width="154" height="43" border="0" title="Toggle Table of Contents" alt="Toggle Table of Contents" /></a></div> -<div id="masthead"> -<table cellpadding="0" cellspacing="0" border="0" style="width:100%"> -<tr> -<td><h1>CodeIgniter User Guide Version 2.0.3</h1></td> -<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td> -</tr> -</table> -</div> -<!-- END NAVIGATION --> - - -<!-- START BREADCRUMB --> -<table cellpadding="0" cellspacing="0" border="0" style="width:100%"> -<tr> -<td id="breadcrumb"> -<a href="http://codeigniter.com/">CodeIgniter Home</a> › -<a href="../index.html">User Guide Home</a> › -Models -</td> -<td id="searchbox"><form method="get" action="http://www.google.com/search"><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="codeigniter.com/user_guide/" />Search User Guide <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" /> <input type="submit" class="submit" name="sa" value="Go" /></form></td> -</tr> -</table> -<!-- END BREADCRUMB --> - -<br clear="all" /> - - -<!-- START CONTENT --> -<div id="content"> - -<h1>Models</h1> - -<p>Models are <strong>optionally</strong> available for those who want to use a more traditional MVC approach.</p> - - - -<ul> -<li><a href="#what">What is a Model?</a></li> -<li><a href="#anatomy">Anatomy of a Model</a></li> -<li><a href="#loading">Loading a Model</a></li> -<li><a href="#auto_load_model">Auto-Loading a Model</a> </li> -<li><a href="#conn">Connecting to your Database</a></li> -</ul> - - - -<h2><a name="what"></a>What is a Model?</h2> - -<p>Models are PHP classes that are designed to work with information in your database. For example, let's say -you use CodeIgniter to manage a blog. You might have a model class that contains functions to insert, update, and -retrieve your blog data. Here is an example of what such a model class might look like:</p> - -<code> -class Blogmodel extends CI_Model {<br /> -<br /> - var $title = '';<br /> - var $content = '';<br /> - var $date = '';<br /> -<br /> - function __construct()<br /> - {<br /> - // Call the Model constructor<br /> - parent::__construct();<br /> - }<br /> - <br /> - function get_last_ten_entries()<br /> - {<br /> - $query = $this->db->get('entries', 10);<br /> - return $query->result();<br /> - }<br /> -<br /> - function insert_entry()<br /> - {<br /> - $this->title = $_POST['title']; // please read the below note<br /> - $this->content = $_POST['content'];<br /> - $this->date = time();<br /> -<br /> - $this->db->insert('entries', $this);<br /> - }<br /> -<br /> - function update_entry()<br /> - {<br /> - $this->title = $_POST['title'];<br /> - $this->content = $_POST['content'];<br /> - $this->date = time();<br /> -<br /> - $this->db->update('entries', $this, array('id' => $_POST['id']));<br /> - }<br /> -<br /> -}</code> - -<p>Note: The functions in the above example use the <a href="../database/active_record.html">Active Record</a> database functions.</p> -<p class="important"><strong>Note:</strong> For the sake of simplicity in this example we're using $_POST directly. This is generally bad practice, and a more common approach would be to use the <a href="../libraries/input.html">Input Class</a> $this->input->post('title')</p> -<h2><a name="anatomy"></a>Anatomy of a Model</h2> - -<p>Model classes are stored in your <dfn>application/models/</dfn> folder. They can be nested within sub-folders if you -want this type of organization.</p> - -<p>The basic prototype for a model class is this:</p> - - -<code> -class <var>Model_name</var> extends CI_Model {<br /> -<br /> - function <var>__construct</var>()<br /> - {<br /> - parent::__construct();<br /> - }<br /> -}</code> - -<p>Where <var>Model_name</var> is the name of your class. Class names <strong>must</strong> have the first letter capitalized with the rest of the name lowercase. -Make sure your class extends the base Model class.</p> - -<p>The file name will be a lower case version of your class name. For example, if your class is this:</p> - -<code> -class <var>User_model</var> extends CI_Model {<br /> -<br /> - function <var>__construct</var>()<br /> - {<br /> - parent::__construct();<br /> - }<br /> -}</code> - -<p>Your file will be this:</p> - -<code>application/models/<var>user_model.php</var></code> - - - -<h2><a name="loading"></a>Loading a Model</h2> - -<p>Your models will typically be loaded and called from within your <a href="controllers.html">controller</a> functions. -To load a model you will use the following function:</p> - -<code>$this->load->model('<var>Model_name</var>');</code> - -<p>If your model is located in a sub-folder, include the relative path from your models folder. For example, if -you have a model located at <dfn>application/models/blog/queries.php</dfn> you'll load it using:</p> - -<code>$this->load->model('<var>blog/queries</var>');</code> - - -<p>Once loaded, you will access your model functions using an object with the same name as your class:</p> - -<code> -$this->load->model('<var>Model_name</var>');<br /> -<br /> -$this-><var>Model_name</var>->function(); -</code> - -<p>If you would like your model assigned to a different object name you can specify it via the second parameter of the loading -function:</p> - - -<code> -$this->load->model('<var>Model_name</var>', '<kbd>fubar</kbd>');<br /> -<br /> -$this-><kbd>fubar</kbd>->function(); -</code> - -<p>Here is an example of a controller, that loads a model, then serves a view:</p> - -<code> -class Blog_controller extends CI_Controller {<br /> -<br /> - function blog()<br /> - {<br /> - $this->load->model('Blog');<br /> -<br /> - $data['query'] = $this->Blog->get_last_ten_entries();<br /><br /> - $this->load->view('blog', $data);<br /> - }<br /> -}</code> - -<h2><a name="auto_load_model" id="auto_load_model"></a>Auto-loading Models</h2> -<p>If you find that you need a particular model globally throughout your application, you can tell CodeIgniter to auto-load it during system initialization. This is done by opening the application/config/autoload.php file and adding the model to the autoload array.</p> - - -<h2><a name="conn"></a>Connecting to your Database</h2> - -<p>When a model is loaded it does <strong>NOT</strong> connect automatically to your database. The following options for connecting are available to you:</p> - -<ul> -<li>You can connect using the standard database methods <a href="../database/connecting.html">described here</a>, either from within your Controller class or your Model class.</li> -<li>You can tell the model loading function to auto-connect by passing <kbd>TRUE</kbd> (boolean) via the third parameter, -and connectivity settings, as defined in your database config file will be used: - - <code>$this->load->model('<var>Model_name</var>', '', <kbd>TRUE</kbd>);</code> - </li> - - -<li>You can manually pass database connectivity settings via the third parameter: - - - <code>$config['hostname'] = "localhost";<br /> - $config['username'] = "myusername";<br /> - $config['password'] = "mypassword";<br /> - $config['database'] = "mydatabase";<br /> - $config['dbdriver'] = "mysql";<br /> - $config['dbprefix'] = "";<br /> - $config['pconnect'] = FALSE;<br /> - $config['db_debug'] = TRUE;<br /> - <br /> - $this->load->model('<var>Model_name</var>', '', <kbd>$config</kbd>);</code></li> -</ul> - - -</div> -<!-- END CONTENT --> - - -<div id="footer"> -<p> -Previous Topic: <a href="views.html">Views</a> - · -<a href="#top">Top of Page</a> · -<a href="../index.html">User Guide Home</a> · -Next Topic: <a href="helpers.html">Helpers</a> -</p> -<p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006 - 2011 · <a href="http://ellislab.com/">EllisLab, Inc.</a></p> -</div> - -</body> -</html>
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