MySQL实现类似Oracle中start with功能

-- 获取父节点树：
DROP FUNCTION IF EXISTS `getParentList`;
DELIMITER $$

CREATE FUNCTION `getParentList`(rootId VARCHAR(10000)) RETURNS VARCHAR(10000) CHARSET utf8
	BEGIN 
		DECLARE sParentList VARCHAR(10000); 
		DECLARE sParentTemp VARCHAR(10000); 
		
		SET sParentTemp =rootId; 
		
		WHILE sParentTemp IS NOT NULL DO 
			IF (sParentList IS NOT NULL) THEN 
				SET sParentList = CONCAT(sParentTemp,',',sParentList); 
			ELSE 
				SET sParentList = CONCAT(sParentTemp); 
			END IF; 
			
			SELECT GROUP_CONCAT(pid) INTO sParentTemp FROM FBS_SYS_ORG WHERE FIND_IN_SET(id,sParentTemp)>0; 
		END WHILE; 
		RETURN sParentList; 
	END$$

DELIMITER ;

-- 调用
SELECT * FROM FBS_SYS_ORG WHERE FIND_IN_SET(id, getParentList('31d8633768a9459d98c9ced15d528cd0'));

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-- 获取子节点树
DROP FUNCTION IF EXISTS `getChildList`;
DELIMITER $$

CREATE FUNCTION `getChildList`(rootId VARCHAR(100)) RETURNS VARCHAR(10000) CHARSET utf8
BEGIN
   DECLARE sChildList VARCHAR(10000);
   DECLARE sChildTemp VARCHAR(1000);
   
   SET sChildTemp =rootId;
   
   WHILE sChildTemp IS NOT NULL DO
	 IF (sChildList IS NOT NULL) THEN 
		SET sChildList = CONCAT(sChildTemp,',',sChildList); 
	 ELSE 
		SET sChildList = CONCAT(sChildTemp); 
	 END IF; 
     
     SELECT GROUP_CONCAT(id) INTO sChildTemp FROM fbs_sys_org WHERE FIND_IN_SET(pid, sChildTemp)>0;
   END WHILE;
   RETURN sChildList;
 END$$

DELIMITER ;

--调用
SELECT * FROM FBS_SYS_ORG WHERE FIND_IN_SET(pid, getChildList('2a597432c97e4111856213ed52b59e64'));

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-- 查询两者之间的节点数
DROP FUNCTION IF EXISTS `getBetweenNodes`;
DELIMITER $$

CREATE FUNCTION `getBetweenNodes`(startNodeId VARCHAR(100), endNodeId VARCHAR(100)) RETURNS VARCHAR(10000) CHARSET utf8
BEGIN
   DECLARE sBetweenNodes VARCHAR(10000);
   SELECT GROUP_CONCAT(id) INTO sBetweenNodes FROM FBS_SYS_ORG WHERE FIND_IN_SET(id, getParentNodes(endNodeId)) AND FIND_IN_SET(pid, getChildNodes(startNodeId));
   RETURN sBetweenNodes;
 END$$

DELIMITER ;

--调用
SELECT * FROM FBS_SYS_ORG WHERE FIND_IN_SET(id, getBetweenNodes('2a597432c97e4111856213ed52b59e64', '31d8633768a9459d98c9ced15d528cd0'));

--或者不定义该函数而直接用sql调两次：
SELECT * FROM FBS_SYS_ORG WHERE FIND_IN_SET(id, getParentNodes('31d8633768a9459d98c9ced15d528cd0')) AND FIND_IN_SET(pid, getChildNodes('2a597432c97e4111856213ed52b59e64'));

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--若没有定义getParentNodes()函数和getChildNodes()函数，则如下实现：
DROP FUNCTION IF EXISTS `getBetweenNodes`;
DELIMITER $$

CREATE FUNCTION `getBetweenNodes`(startNodeId VARCHAR(100), endNodeId VARCHAR(100)) RETURNS VARCHAR(10000) CHARSET utf8
BEGIN
   DECLARE sBetweenNodes VARCHAR(10000);  
   DECLARE sParentNodes VARCHAR(10000);   
   DECLARE sParentNodeTemp VARCHAR(10000);
   DECLARE sChildNodes VARCHAR(10000);    
   DECLARE sChildNodeTemp VARCHAR(10000); 
   
   SET sChildNodeTemp =startNodeId;
   
   WHILE sChildNodeTemp IS NOT NULL DO
	 IF (sChildNodes IS NOT NULL) THEN 
		SET sChildNodes = CONCAT(sChildNodeTemp,',',sChildNodes); 
	 ELSE 
		SET sChildNodes = CONCAT(sChildNodeTemp); 
	 END IF; 
     
     SELECT GROUP_CONCAT(id) INTO sChildNodeTemp FROM fbs_sys_org WHERE FIND_IN_SET(pid, sChildNodeTemp)>0;
   END WHILE;
   
   SET sParentNodeTemp =endNodeId;
   
   WHILE sParentNodeTemp IS NOT NULL DO 
		IF (sParentNodes IS NOT NULL) THEN 
			SET sParentNodes = CONCAT(sParentNodeTemp,',',sParentNodes); 
		ELSE 
			SET sParentNodes = CONCAT(sParentNodeTemp); 
		END IF; 
		
		SELECT GROUP_CONCAT(pid) INTO sParentNodeTemp FROM FBS_SYS_ORG WHERE FIND_IN_SET(id, sParentNodeTemp)>0; 
   END WHILE; 
   
   SELECT GROUP_CONCAT(id) INTO sBetweenNodes FROM fbs_sys_org WHERE FIND_IN_SET(id, sParentNodes) AND FIND_IN_SET(pid, sChildNodes);
   
   RETURN sBetweenNodes;
 END$$

DELIMITER ;