/**
  * Constructor
  *
  * @param array $args
  */
 public function __construct(array $args = array())
 {
     $this->_resource = isset($args['resource']) ? $args['resource'] : Mage::getSingleton('core/resource');
     $this->_connection = isset($args['connection']) ? $args['connection'] : $this->_resource->getConnection(Mage_Core_Model_Resource::DEFAULT_WRITE_RESOURCE);
 }