cakephp打印sql语句的方法

$sources = ConnectionManager::sourceList(); 
if (!isset($logs)): 
$logs = array(); 
foreach ($sources as $source): 
$db =& ConnectionManager::getDataSource($source); 
if (!$db->isInterfaceSupported('getLog')): 
continue; 
endif; 
$logs[$source] = $db->getLog(); 
endforeach; 
endif;