SQL开发知识：mysql查询上下级机构的方法实例

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;

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’);

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 $$

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 $$