多级树形表结构获取所有父级id的存储过程

表结构：id，pid自关联的树形结构 

DROP PROCEDURE IF EXISTS getAncestros;
DELIMITER $$

CREATE
    /*[DEFINER = { user | CURRENT_USER }]*/
    PROCEDURE `getAncestros`(IN deptId INT,INOUT ances VARCHAR(1000))
    /*LANGUAGE SQL
    | [NOT] DETERMINISTIC
    | { CONTAINS SQL | NO SQL | READS SQL DATA | MODIFIES SQL DATA }
    | SQL SECURITY { DEFINER | INVOKER }
    | COMMENT 'string'*/
    BEGIN
	DECLARE pid INT DEFAULT 0;
	SET pid = (SELECT parent_id FROM sys_dept WHERE dept_id = deptId);
	IF pid <> 0 AND LENGTH(ances) < 999  THEN
	    SET ances = CONCAT(pid,',',ances);
	    CALL getAncestros(pid,ances);
	END IF;
    END$$

DELIMITER ;


DROP PROCEDURE IF EXISTS updateDepat;
SET @@max_sp_recursion_depth = 100;
DELIMITER $$

CREATE
    /*[DEFINER = { user | CURRENT_USER }]*/
    PROCEDURE `updateDepat`()
    /*LANGUAGE SQL
    | [NOT] DETERMINISTIC
    | { CONTAINS SQL | NO SQL | READS SQL DATA | MODIFIES SQL DATA }
    | SQL SECURITY { DEFINER | INVOKER }
    | COMMENT 'string'*/

    BEGIN
        DECLARE total INT DEFAULT 0;
        DECLARE i INT DEFAULT 0;
        DECLARE pid INT DEFAULT 0;
        DECLARE cid INT DEFAULT 0;
        DECLARE ace VARCHAR(1000) DEFAULT '';
	SET total = (SELECT COUNT(1) FROM `sys_dept`);
	WHILE i < total DO
	    SET ace = '';
	    SET pid = (SELECT parent_id FROM `sys_dept` LIMIT i,1);
	    SET cid = (SELECT dept_id FROM `sys_dept` LIMIT i,1);
	    CALL getAncestros(cid,ace);
	    SET ace = LEFT(ace,LENGTH(ace)-1);
	    IF pid <> 0 THEN
		UPDATE `sys_dept` SET ancestors = ace,update_time = NOW() WHERE dept_id = cid;
	    END IF;
	    SET i=i+1;
	END WHILE;
    END$$

DELIMITER ;
CALL updateDepat();