usage examples
Model_Article::query()-&gt;where('id', 4)->where('category_id', '&gt;', 1);
Model_Article::query()-&gt;where(array('id' =&gt; 4, 'category_id' =&gt; 6));
Model_Article::find('all', array('where' =&gt; array(array('category_id', '=', 5), array('publish', '&lt;', time()))));

// Using or where
Model_Article::query()-&gt;where('id', 4)-&gt;or_where('id', 5);
</code></pre>
								</td>
							<tr>
								<th>order_by</th>
								<td>string <kbd>$column</kbd>, [string <kbd>$direction</kbd>]</td