Initial Import
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+<td><h1>Code Igniter User Guide Version 1.4.0</h1></td>
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+Models
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+
+<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="#conn">Connecting to your Database</a></li>
+
+</ul>
+
+
+<a name="what"></a>
+<h2>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 Code Igniter 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 Model {<br />
+<br />
+ var $title = '';<br />
+ var $content = '';<br />
+ var $date = '';<br />
+<br />
+ function Blogmodel()<br />
+ {<br />
+ // Call the Model constructor<br />
+ parent::Model();<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'];<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', $_POST['id']));<br />
+ }<br />
+<br />
+}</code>
+
+<p>Note: The functions in the above example use the <a href="../libraries/database/active_record.html">Active Record</a> database functions.</p>
+
+
+<a name="anatomy"></a>
+<h2>Anatomy of a Model</h2>
+
+<p>Model classes are stored in your <dfn>application/models/</dfn> folder. The basic prototype for a model is this:</p>
+
+
+<code>
+class <var>Model_name</var> extends Model {<br />
+<br />
+ function <var>Model_name</var>()<br />
+ {<br />
+ parent::Model();<br />
+ }<br />
+}</code>
+
+<p>Where <var>Model_name</var> is the name of your class. Class names <strong>must</strong> be capitalized.
+Make sure your class extends the base Model class.</p>
+
+<p>The file name will be a lower case version of your class name. For example, if your class is this:</p>
+
+<code>
+class <var>User_model</var> extends Model {<br />
+<br />
+ function <var>User_model</var>()<br />
+ {<br />
+ parent::Model();<br />
+ }<br />
+}</code>
+
+<p>Your file will be this:</p>
+
+<code>application/models/<var>user_model.php</var></code>
+
+
+<a name="loading"></a>
+<h2>Loading a Model</h2>
+
+<p>Your models will typically be loaded and called from within your <a href="controllers.html">controller</a> functions.
+To load a model you will use the following function:</p>
+
+<code>$this->load->model('<var>Model_name</var>');</code>
+
+<p>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 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', $data);<br />
+ }<br />
+}</code>
+
+
+
+<a name="conn"></a>
+<h2>Connecting to your Database</h2>
+
+<p>When a model is loaded it does <strong>NOT</strong> connect automatically to your database. The following options for connecting are available to you:</p>
+
+<ul>
+<li>You can connect using the standard database methods <a href="../libraries/database/connecting.html">described here</a>, either from within your Controller class or your Model class.</li>
+<li>You can tell the model loading function to auto-connect by passing <kbd>TRUE</kbd> (boolean) via the third parameter,
+and connectivity settings, as defined in your database config file will be used:
+
+ <code>$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 />
+ $config['active_r'] = TRUE;<br />
+ <br />
+ $this->load->model('<var>Model_name</var>', '', <kbd>$config</kbd>);</code></li>
+</ul>
+
+
+
+
+
+
+
+</div>
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