diff options
Diffstat (limited to 'user_guide/database/results.html')
| -rw-r--r-- | user_guide/database/results.html | 259 |
1 files changed, 0 insertions, 259 deletions
diff --git a/user_guide/database/results.html b/user_guide/database/results.html deleted file mode 100644 index 0baf992fb..000000000 --- a/user_guide/database/results.html +++ /dev/null @@ -1,259 +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>Generating Query Results : 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 2.1.0</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> › -Query Results -</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>Generating Query Results</h1> - - -<p>There are several ways to generate query results:</p> - - <h2>result()</h2> - - <p>This function returns the query result as an array of <strong>objects</strong>, or <strong>an empty array</strong> on failure. - - Typically you'll use this in a foreach loop, like this:</p> - - <code> - $query = $this->db->query("YOUR QUERY");<br /> - <br /> - foreach ($query->result() as $row)<br /> - {<br /> - echo $row->title;<br /> - echo $row->name;<br /> - echo $row->body;<br /> - }</code> - - <p>The above <dfn>function</dfn> is an alias of <dfn>result_object()</dfn>.</p> - - <p>If you run queries that might <strong>not</strong> produce a result, you are encouraged to test the result first:</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> - - <p>You can also pass a string to result() which represents a class to instantiate for each result object (note: this class must be loaded)</p> - - <code> - $query = $this->db->query("SELECT * FROM users;");<br /> - <br /> - foreach ($query->result('User') as $row)<br /> - {<br /> - echo $row->name; // call attributes<br /> - echo $row->reverse_name(); // or methods defined on the 'User' class<br /> - } - </code> - - <h2>result_array()</h2> - - <p>This function returns the query result as a pure array, or an empty array when no result is produced. Typically you'll use this in a foreach loop, like this:</p> - <code> - $query = $this->db->query("YOUR QUERY");<br /> - <br /> - foreach ($query->result_array() as $row)<br /> - {<br /> - echo $row['title'];<br /> - echo $row['name'];<br /> - echo $row['body'];<br /> - }</code> - - - <h2>row()</h2> - - <p>This function returns a single result row. If your query has more than one row, it returns only the first row. - The result is returned as an <strong>object</strong>. Here's a usage example:</p> - <code> - $query = $this->db->query("YOUR QUERY");<br /> - <br /> - if ($query->num_rows() > 0)<br /> - {<br /> - $row = $query->row(); - <br /><br /> - echo $row->title;<br /> - echo $row->name;<br /> - echo $row->body;<br /> - } - </code> - - <p>If you want a specific row returned you can submit the row number as a digit in the first parameter:</p> - - <code>$row = $query->row(<dfn>5</dfn>);</code> - - <p>You can also add a second String parameter, which is the name of a class to instantiate the row with:</p> - - <code> - $query = $this->db->query("SELECT * FROM users LIMIT 1;");<br /> - <br /> - $query->row(0, 'User')<br /> - echo $row->name; // call attributes<br /> - echo $row->reverse_name(); // or methods defined on the 'User' class<br /> - </code> - - <h2>row_array()</h2> - - <p>Identical to the above <var>row()</var> function, except it returns an array. Example:</p> - - <code> - $query = $this->db->query("YOUR QUERY");<br /> - <br /> - if ($query->num_rows() > 0)<br /> - {<br /> - $row = $query->row_array(); - <br /><br /> - echo $row['title'];<br /> - echo $row['name'];<br /> - echo $row['body'];<br /> - } - </code> - - - <p>If you want a specific row returned you can submit the row number as a digit in the first parameter:</p> - - <code>$row = $query->row_array(<dfn>5</dfn>);</code> - - - <p>In addition, you can walk forward/backwards/first/last through your results using these variations:</p> - -<p> - <strong>$row = $query->first_row()</strong><br /> - <strong>$row = $query->last_row()</strong><br /> - <strong>$row = $query->next_row()</strong><br /> - <strong>$row = $query->previous_row()</strong> -</p> - -<p>By default they return an object unless you put the word "array" in the parameter:</p> - -<p> - <strong>$row = $query->first_row('array')</strong><br /> - <strong>$row = $query->last_row('array')</strong><br /> - <strong>$row = $query->next_row('array')</strong><br /> - <strong>$row = $query->previous_row('array')</strong> -</p> - - - -<h1>Result Helper Functions</h1> - - -<h2>$query->num_rows()</h2> -<p>The number of rows returned by the query. Note: In this example, <dfn>$query</dfn> is the variable that the query result object is assigned to:</p> - -<code>$query = $this->db->query('SELECT * FROM my_table');<br /><br /> -echo $query->num_rows(); -</code> - -<h2>$query->num_fields()</h2> -<p>The number of FIELDS (columns) returned by the query. Make sure to call the function using your query result object:</p> - -<code>$query = $this->db->query('SELECT * FROM my_table');<br /><br /> -echo $query->num_fields(); -</code> - - - -<h2>$query->free_result()</h2> -<p>It frees the memory associated with the result and deletes the result resource ID. Normally PHP frees its memory automatically at the end of script -execution. However, if you are running a lot of queries in a particular script you might want to free the result after each query result has been -generated in order to cut down on memory consumptions. Example: -</p> - -<code>$query = $this->db->query('SELECT title FROM my_table');<br /><br /> -foreach ($query->result() as $row)<br /> -{<br /> - echo $row->title;<br /> -}<br /> -$query->free_result(); // The $query result object will no longer be available<br /> -<br /> -$query2 = $this->db->query('SELECT name FROM some_table');<br /><br /> -$row = $query2->row();<br /> -echo $row->name;<br /> -$query2->free_result(); // The $query2 result object will no longer be available -</code> - - - - - -</div> -<!-- END CONTENT --> - - -<div id="footer"> -<p> -Previous Topic: <a href="queries.html">Queries</a> - · -<a href="#top">Top of Page</a> · -<a href="../index.html">User Guide Home</a> · -Next Topic: <a href="helpers.html">Query Helper Functions</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> |