bzr branch
http://gegoxaren.bato24.eu/bzr/lenasys/trunk
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20.1.1
by galaxyAbstractor
* Added an simple admin panel to the codeviewer-cmssy stuff |
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<title>Generating Query Results : CodeIgniter User Guide</title> |
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<table cellpadding="0" cellspacing="0" border="0" style="width:100%"> |
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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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<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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Query Results |
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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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<!-- START CONTENT -->
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<div id="content"> |
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<h1>Generating Query Results</h1> |
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<p>There are several ways to generate query results:</p> |
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<h2>result()</h2> |
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<p>This function returns the query result as an array of <strong>objects</strong>, or <strong>an empty array</strong> on failure. |
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Typically you'll use this in a foreach loop, like this:</p> |
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<code> |
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$query = $this->db->query("YOUR QUERY");<br />
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<br /> |
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foreach ($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 $row->body;<br /> |
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}</code> |
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<p>The above <dfn>function</dfn> is an alias of <dfn>result_object()</dfn>.</p> |
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<p>If you run queries that might <strong>not</strong> produce a result, you are encouraged to test the result first:</p> |
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<code> |
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$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 $row->body;<br /> |
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}<br /> |
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} |
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</code> |
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<p>You can also pass a string to result() which represents a class to instantiate for each result object (note: this class must be loaded)</p> |
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<code> |
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$query = $this->db->query("SELECT * FROM users;");<br />
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<br /> |
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foreach ($query->result('User') as $row)<br />
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{<br />
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echo $row->name; // call attributes<br /> |
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echo $row->reverse_name(); // or methods defined on the 'User' class<br /> |
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} |
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</code> |
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<h2>result_array()</h2> |
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<p>This function returns the query result as a pure array, or an empty array when no result is produced. Typically you'll use this in a foreach loop, like this:</p> |
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<code> |
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$query = $this->db->query("YOUR QUERY");<br />
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<br /> |
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foreach ($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 $row['body'];<br /> |
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}</code> |
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<h2>row()</h2> |
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<p>This function returns a single result row. If your query has more than one row, it returns only the first row. |
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The result is returned as an <strong>object</strong>. Here's a usage example:</p> |
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<code> |
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$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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$row = $query->row();
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<br /><br /> |
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echo $row->title;<br /> |
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echo $row->name;<br /> |
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echo $row->body;<br /> |
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} |
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</code> |
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<p>If you want a specific row returned you can submit the row number as a digit in the first parameter:</p> |
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<code>$row = $query->row(<dfn>5</dfn>);</code> |
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<p>You can also add a second String parameter, which is the name of a class to instantiate the row with:</p> |
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<code> |
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$query = $this->db->query("SELECT * FROM users LIMIT 1;");<br />
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<br /> |
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$query->row(0, 'User')<br /> |
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echo $row->name; // call attributes<br /> |
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echo $row->reverse_name(); // or methods defined on the 'User' class<br /> |
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</code> |
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<h2>row_array()</h2> |
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<p>Identical to the above <var>row()</var> function, except it returns an array. Example:</p> |
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<code> |
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$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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$row = $query->row_array();
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<br /><br /> |
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echo $row['title'];<br /> |
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echo $row['name'];<br /> |
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echo $row['body'];<br /> |
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} |
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</code> |
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<p>If you want a specific row returned you can submit the row number as a digit in the first parameter:</p> |
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<code>$row = $query->row_array(<dfn>5</dfn>);</code> |
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<p>In addition, you can walk forward/backwards/first/last through your results using these variations:</p> |
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<p> |
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<strong>$row = $query->first_row()</strong><br /> |
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<strong>$row = $query->last_row()</strong><br /> |
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<strong>$row = $query->next_row()</strong><br /> |
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<strong>$row = $query->previous_row()</strong> |
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</p> |
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<p>By default they return an object unless you put the word "array" in the parameter:</p> |
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<p> |
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<strong>$row = $query->first_row('array')</strong><br /> |
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<strong>$row = $query->last_row('array')</strong><br /> |
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<strong>$row = $query->next_row('array')</strong><br /> |
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<strong>$row = $query->previous_row('array')</strong> |
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</p> |
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<h1>Result Helper Functions</h1> |
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<h2>$query->num_rows()</h2> |
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<p>The number of rows returned by the query. Note: In this example, <dfn>$query</dfn> is the variable that the query result object is assigned to:</p> |
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<code>$query = $this->db->query('SELECT * FROM my_table');<br /><br /> |
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echo $query->num_rows(); |
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</code> |
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<h2>$query->num_fields()</h2> |
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<p>The number of FIELDS (columns) returned by the query. Make sure to call the function using your query result object:</p> |
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<code>$query = $this->db->query('SELECT * FROM my_table');<br /><br /> |
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echo $query->num_fields(); |
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</code> |
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<h2>$query->free_result()</h2> |
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<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 |
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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 |
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generated in order to cut down on memory consumptions. Example: |
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</p> |
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<code>$query = $this->db->query('SELECT title FROM my_table');<br /><br /> |
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foreach ($query->result() as $row)<br /> |
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{<br />
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echo $row->title;<br /> |
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}<br /> |
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$query->free_result(); // The $query result object will no longer be available<br /> |
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<br /> |
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$query2 = $this->db->query('SELECT name FROM some_table');<br /><br />
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$row = $query2->row();<br /> |
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echo $row->name;<br /> |
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$query2->free_result(); // The $query2 result object will no longer be available |
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</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="queries.html">Queries</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="helpers.html">Query Helper Functions</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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