Mysql创建递归型的存储过程_MySQL

Mysql创建递归型的存储过程

第一步：SET max_sp_recursion_depth=12;

第二步：创建createChildDept过程

Sql代码

DELIMITER $$

USE `zhiku`$$

DROP PROCEDURE IF EXISTS `createChildDept`$$

CREATE DEFINER=`root`@`%` PROCEDURE `createChildDept`(IN rootId INT,IN nDepth INT)

BEGIN

DECLARE done INT DEFAULT 0;

DECLARE b INT;

DECLARE cur1 CURSOR FOR SELECT id FROM zk_departments WHERE parent_id=rootId;

DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;

INSERT INTO tmpLst VALUES (NULL,rootId,nDepth);

OPEN cur1;

FETCH cur1 INTO b;

WHILE done=0 DO

CALL createChildDept(b,nDepth+1);

FETCH cur1 INTO b;

END WHILE;

CLOSE cur1;

END$$

DELIMITER ;

第三步：创建showChildDept

Sql代码

DELIMITER $$

USE `zhiku`$$

DROP PROCEDURE IF EXISTS `showChildDept`$$

CREATE DEFINER=`root`@`%` PROCEDURE `showChildDept`(IN rootId INT)

BEGIN

CREATE TEMPORARY TABLE IF NOT EXISTS tmpLst

(sno INT PRIMARY KEY AUTO_INCREMENT,id INT,depth INT);

DELETE FROM tmpLst;

CALL createChildDept(rootId,0);

SELECT zk_departments.id,zk_departments.name FROM tmpLst,zk_departments WHERE tmpLst.id=zk_departments.id AND zk_departments.id>rootId ORDER BY tmpLst.sno;

#select zk_user_departments.dept_id,zk_user_departments.user_id from zk_user_departments left join tmpLst on tmpLst.id=zk_user_departments.dept_id and zk_user_departments.dept_id>rootId order by tmpLst.sno;

END$$

DELIMITER ;

第四步：CALL showChildDept(128)