217 lines
7.3 KiB
HTML
217 lines
7.3 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>Database Quick Start : CodeIgniter User Guide</title>
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<style type='text/css' media='all'>@import url('../userguide.css');</style>
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<link rel='stylesheet' type='text/css' media='all' href='../userguide.css' />
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<script type="text/javascript" src="../nav/nav.js"></script>
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<script type="text/javascript" src="../nav/prototype.lite.js"></script>
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<script type="text/javascript" src="../nav/moo.fx.js"></script>
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<script type="text/javascript" src="../nav/user_guide_menu.js"></script>
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<meta http-equiv='expires' content='-1' />
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<meta http-equiv= 'pragma' content='no-cache' />
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<meta name='robots' content='all' />
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<meta name='author' content='ExpressionEngine Dev Team' />
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<meta name='description' content='CodeIgniter User Guide' />
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</head>
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<body>
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<!-- START NAVIGATION -->
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<div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div>
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<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>
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<div id="masthead">
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<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
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<tr>
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<td><h1>CodeIgniter User Guide Version 2.1.3</h1></td>
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<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
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</tr>
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</table>
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</div>
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<!-- END NAVIGATION -->
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<!-- START BREADCRUMB -->
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<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
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<tr>
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<td id="breadcrumb">
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<a href="http://codeigniter.com/">CodeIgniter Home</a> ›
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<a href="../index.html">User Guide Home</a> ›
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<a href="index.html">Database Library</a> ›
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Database Example Code
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</td>
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<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>
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</tr>
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</table>
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<!-- END BREADCRUMB -->
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<br clear="all" />
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<!-- START CONTENT -->
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<div id="content">
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<h1>Database Quick Start: Example Code</h1>
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<p>The following page contains example code showing how the database class is used. For complete details please
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read the individual pages describing each function.</p>
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<h2>Initializing the Database Class</h2>
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<p>The following code loads and initializes the database class based on your <a href="configuration.html">configuration</a> settings:</p>
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<code>$this->load->database();</code>
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<p>Once loaded the class is ready to be used as described below.</p>
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<p>Note: If all your pages require database access you can connect automatically. See the <a href="connecting.html">connecting</a> page for details.</p>
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<h2>Standard Query With Multiple Results (Object Version)</h2>
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<code>$query = $this->db->query('SELECT name, title, email FROM my_table');<br />
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<br />
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foreach ($query->result() as $row)<br />
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{<br />
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echo $row->title;<br />
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echo $row->name;<br />
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echo $row->email;<br />
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}<br />
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<br />
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echo 'Total Results: ' . $query->num_rows();
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</code>
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<p>The above <dfn>result()</dfn> function returns an array of <strong>objects</strong>. Example: $row->title</p>
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<h2>Standard Query With Multiple Results (Array Version)</h2>
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<code>$query = $this->db->query('SELECT name, title, email FROM my_table');<br />
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<br />
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foreach ($query->result_array() as $row)<br />
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{<br />
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echo $row['title'];<br />
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echo $row['name'];<br />
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echo $row['email'];<br />
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}</code>
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<p>The above <dfn>result_array()</dfn> function returns an array of standard array indexes. Example: $row['title']</p>
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<h2>Testing for Results</h2>
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<p>If you run queries that might <strong>not</strong> produce a result, you are encouraged to test for a result first
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using the <dfn>num_rows()</dfn> function:</p>
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<code>
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$query = $this->db->query("YOUR QUERY");<br />
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<br />
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if ($query->num_rows() > 0)<br />
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{<br />
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foreach ($query->result() as $row)<br />
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{<br />
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echo $row->title;<br />
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echo $row->name;<br />
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echo $row->body;<br />
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}<br />
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}
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</code>
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<h2>Standard Query With Single Result</h2>
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<code>$query = $this->db->query('SELECT name FROM my_table LIMIT 1');<br />
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<br />
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$row = $query->row();<br />
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echo $row->name;<br />
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</code>
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<p>The above <dfn>row()</dfn> function returns an <strong>object</strong>. Example: $row->name</p>
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<h2>Standard Query With Single Result (Array version)</h2>
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<code>$query = $this->db->query('SELECT name FROM my_table LIMIT 1');<br />
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<br />
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$row = $query->row_array();<br />
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echo $row['name'];<br />
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</code>
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<p>The above <dfn>row_array()</dfn> function returns an <strong>array</strong>. Example: $row['name']</p>
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<h2>Standard Insert</h2>
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<code>
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$sql = "INSERT INTO mytable (title, name) <br />
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VALUES (".$this->db->escape($title).", ".$this->db->escape($name).")";<br />
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<br />
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$this->db->query($sql);<br />
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<br />
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echo $this->db->affected_rows();
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</code>
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<h2>Active Record Query</h2>
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<p>The <a href="active_record.html">Active Record Pattern</a> gives you a simplified means of retrieving data:</p>
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<code>
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$query = $this->db->get('table_name');<br />
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<br />
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foreach ($query->result() as $row)<br />
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{<br />
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echo $row->title;<br />
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}</code>
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<p>The above <dfn>get()</dfn> function retrieves all the results from the supplied table.
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The <a href="active_record.html">Active Record</a> class contains a full compliment of functions
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for working with data.</p>
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<h2>Active Record Insert</h2>
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<code>
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$data = array(<br />
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'title' => $title,<br />
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'name' => $name,<br />
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'date' => $date<br />
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);<br />
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<br />
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$this->db->insert('mytable', $data);
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<br /><br />
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// Produces: INSERT INTO mytable (title, name, date) VALUES ('{$title}', '{$name}', '{$date}')</code>
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</div>
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<!-- END CONTENT -->
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<div id="footer">
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<p>
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Previous Topic: <a href="index.html">Database Class</a>
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·
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<a href="#top">Top of Page</a> ·
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<a href="../index.html">User Guide Home</a> ·
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Next Topic: <a href="configuration.html">Database Configuration</a>
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</p>
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<p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006 - 2012 · <a href="http://ellislab.com/">EllisLab, Inc.</a></p>
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</div>
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</body>
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</html>
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