function getBookIds() {

		/** @var $wpdb \wpdb */
		global $wpdb;

		$sql = "SELECT blogs_id FROM {$this->dbTable} WHERE users_id = %d AND deleted = 0 ";

		return $wpdb->get_col( $wpdb->prepare( $sql, $this->userId ) ); // @codingStandardsIgnoreLine
	}
function getBookIds() {

		/** @var $wpdb \wpdb */
		global $wpdb;

		$sql = "SELECT blogs_id FROM {$this->dbTable} WHERE users_id = %d AND deleted = 0 ";

		return $wpdb->get_col( $wpdb->prepare( $sql, $this->userId ) ); // @codingStandardsIgnoreLine
	}
function getBookIds ( ) { /** @var $wpdb \wpdb */ global $ wpdb ; $ sql = "SELECT blogs_id FROM {$this->dbTable} WHERE users_id = %d AND deleted = 0 " ; return $ wpdb -> get_col ( $ wpdb -> prepare ( $ sql , $ this -> userId ) ) ; // @codingStandardsIgnoreLine }
Get only blog IDs.

@return array
Get only blog IDs .