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<!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>Database Quick Start : 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 1.7.1</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> › <a href="index.html">Database Library</a> › Database Example Code</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>Database Quick Start: Example Code</h1><p>The following page contains example code showing how the database class is used. For complete details pleaseread the individual pages describing each function.</p><h2>Initializing the Database Class</h2><p>The following code loads and initializes the database class based on your <a href="configuration.html">configuration</a> settings:</p><code>$this->load->database();</code><p>Once loaded the class is ready to be used as described below.</p><p>Note: If all your pages require database access you can connect automatically. See the <a href="connecting.html">connecting</a> page for details.</p><h2>Standard Query With Multiple Results (Object Version)</h2><code>$query = $this->db->query('SELECT name, title, email FROM my_table');<br /><br />foreach ($query->result() as $row)<br />{<br /> echo $row->title;<br /> echo $row->name;<br /> echo $row->email;<br />}<br /><br />echo 'Total Results: ' . $query->num_rows();</code><p>The above <dfn>result()</dfn> function returns an array of <strong>objects</strong>. Example: $row->title</p><h2>Standard Query With Multiple Results (Array Version)</h2><code>$query = $this->db->query('SELECT name, title, email FROM my_table');<br /><br />foreach ($query->result_array() as $row)<br />{<br /> echo $row['title'];<br /> echo $row['name'];<br /> echo $row['email'];<br />}</code><p>The above <dfn>result_array()</dfn> function returns an array of standard array indexes. Example: $row['title']</p><h2>Testing for Results</h2><p>If you run queries that might <strong>not</strong> produce a result, you are encouraged to test for a result firstusing the <dfn>num_rows()</dfn> function:</p><code>$query = $this->db->query("YOUR QUERY");<br /><br />if ($query->num_rows() > 0)<br />{<br /> foreach ($query->result() as $row)<br /> {<br /> echo $row->title;<br /> echo $row->name;<br /> echo $row->body;<br /> }<br />}</code><h2>Standard Query With Single Result</h2><code>$query = $this->db->query('SELECT name FROM my_table LIMIT 1');<br /><br />$row = $query->row();<br />echo $row->name;<br /></code><p>The above <dfn>row()</dfn> function returns an <strong>object</strong>. Example: $row->name</p><h2>Standard Query With Single Result (Array version)</h2><code>$query = $this->db->query('SELECT name FROM my_table LIMIT 1');<br /><br />$row = $query->row_array();<br />echo $row['name'];<br /></code><p>The above <dfn>row_array()</dfn> function returns an <strong>array</strong>. Example: $row['name']</p><h2>Standard Insert</h2><code>$sql = "INSERT INTO mytable (title, name) <br /> VALUES (".$this->db->escape($title).", ".$this->db->escape($name).")";<br /><br />$this->db->query($sql);<br /><br />echo $this->db->affected_rows();</code><h2>Active Record Query</h2><p>The <a href="active_record.html">Active Record Pattern</a> gives you a simplified means of retrieving data:</p><code>$query = $this->db->get('table_name');<br /><br />foreach ($query->result() as $row)<br />{<br /> echo $row->title;<br />}</code><p>The above <dfn>get()</dfn> function retrieves all the results from the supplied table.The <a href="active_record.html">Active Record</a> class contains a full compliment of functionsfor working with data.</p><h2>Active Record Insert</h2><code>$data = array(<br /> 'title' => $title,<br /> 'name' => $name,<br /> 'date' => $date<br /> );<br /><br />$this->db->insert('mytable', $data);<br /><br />// Produces: INSERT INTO mytable (title, name, date) VALUES ('{$title}', '{$name}', '{$date}')</code></div><!-- END CONTENT --><div id="footer"><p>Previous Topic: <a href="index.html">Database Class</a> · <a href="#top">Top of Page</a> · <a href="../index.html">User Guide Home</a> · Next Topic: <a href="configuration.html">Database Configuration</a></p><p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006-2008 · <a href="http://ellislab.com/">Ellislab, Inc.</a></p></div></body></html>