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<td><h1>Code Igniter User Guide Version 1.4.0</h1></td>
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<a href="http://www.codeigniter.com/">Code Igniter Home</a> ›
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<a href="index.html">Database Library</a> ›
Query Results
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<h1>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>FALSE</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>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>
<h2>result_array()</h2>
<p>This function returns the query result as a pure array, or FALSE 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_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 $row->body;<br />
}
</code>
<p>If you want a specific row returned you can submit the row number as a digit in the first parameter:
<code>$row = $query->row(<dfn>5</dfn>);</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 $row['body'];<br />
}
</code>
<p>If you want a specific row returned you can submit the row number as a digit in the first parameter:
<code>$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 = $query->previous_row('array')</strong>
</p>
<h1><br />Query Result Helpers</h1>
<p>The following functions provide useful information when dealing with query results.</p>
<h2>$query->num_rows()</h2>
<p>The number of rows returned by the query. Note: <dfn>$query</dfn> is the variable that the query was assigned to:</p>
<code>$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 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 $query->num_fields();
</code>
<h2>$this->db->insert_id()</h2>
<p>The insert ID number when performing database inserts.</p>
<h2>$this->db->affected_rows()</h2>
<p>Displays the number of affected rows, when doing "write" type queries (insert, update, etc.).</p>
</p>Note: In MySQL "DELETE FROM TABLE" returns 0 affected rows. The database class has a small hack that allows it to return the
correct number of affected rows. By default this hack is enabled but it can be turned off in the database driver file.</p>
<h2>$this->db->version()</h2>
<p>Outputs the database version you are running:</p>
<code>echo $this->db->version();</code>
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