How to query superior and subordinate organizations in mysql

Idea:

• Customize mysql method

• Use the two methods [FIND_IN_SET][group_concat] in mysql

(1) Prepare test data table

CREATE TABLE `org_test` (
  `org_no` varchar(32) NOT NULL COMMENT '机构编号',
  `org_name` varchar(200) NOT NULL COMMENT '机构名称',
  `p_org_no` varchar(32) DEFAULT NULL COMMENT '上级机构编号',
  PRIMARY KEY (`org_no`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

Test data

INSERT INTO `org_test` VALUES ('1001', '福建省', null);
INSERT INTO `org_test` VALUES ('100101', '厦门市', '1001');
INSERT INTO `org_test` VALUES ('10010101', '思明区', '100101');
INSERT INTO `org_test` VALUES ('10010102', '湖里区', '100101');
INSERT INTO `org_test` VALUES ('10010103', '同安区', '100101');
INSERT INTO `org_test` VALUES ('100102', '福州市', '1001');

(2) Query all subordinate organizations of the designated organization (including itself)

delimiter $$
CREATE FUNCTION getOrgChild (orgNo varchar(32)) RETURNS varchar(1000) CHARSET utf8
BEGIN
	-- 定义临时变量
	DECLARE tmpOrg varchar(1000) DEFAULT '';
	-- 循环查询,orgNo不为空,则循环
	WHILE orgNo IS NOT NULL DO
		-- 拼接所有查询结果
		IF tmpOrg = '' THEN
			SET tmpOrg = CONCAT(tmpOrg, orgNo);
		ELSE
			SET tmpOrg = CONCAT(tmpOrg, ',', orgNo);
		END IF;
		-- 查询数据
		SELECT group_concat(org_no) INTO orgNo FROM org_test WHERE FIND_IN_SET(p_org_no, orgNo) > 0;
	END WHILE;
	
	-- 返回结果
	RETURN tmpOrg;
END $$

Test results:

(3) Query all parent organizations of the designated organization (including itself)

delimiter $$
CREATE FUNCTION getOrgParent (orgNo varchar(32)) RETURNS varchar(1000) CHARSET utf8
BEGIN
	-- 定义临时变量
	DECLARE tmpOrg varchar(1000) DEFAULT '';
	-- 循环查询,orgNo不为空,则循环
	WHILE orgNo IS NOT NULL DO
		-- 拼接所有查询结果
		IF tmpOrg = '' THEN
			SET tmpOrg = CONCAT(tmpOrg, orgNo);
		ELSE
			SET tmpOrg = CONCAT(tmpOrg, ',', orgNo);
		END IF;
		-- 查询数据
		SELECT group_concat(p_org_no) INTO orgNo FROM org_test WHERE FIND_IN_SET(org_no, orgNo) > 0;
	END WHILE;
	
	-- 返回结果
	RETURN tmpOrg;
END $$

Test results:

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