<!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 2.0.2</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 please read 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 first using 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 functions for 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 - 2011 · <a href="http://ellislab.com/">EllisLab, Inc.</a></p> </div> </body> </html>