public function load( $query = null ) {
		global $wpdb;
		$table_name = $wpdb->prefix . $this->_table_name;

		if ( ! $query ) {
			$query = "SELECT * FROM $table_name";
		}
		$rows = $wpdb->get_results( $query, ARRAY_A );
		if ( ! empty( $rows ) ) {
			$results = array();
			foreach ( $rows as $row ) {
				$model = new $this->_class_name;
				$model->process_load( $row );
				$results[] = $model;
			}

			return $results;
		}

		return array();
	}