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服务器之家 - 数据库 - Mysql - MySQL递归查询的3种实现方式实例

MySQL递归查询的3种实现方式实例

2022-10-20 15:40十&年 Mysql

在项目中会遇到同一个表中保存着父子关系的数据,最常见的就是处理树形结构资源,下面这篇文章主要给大家介绍了关于MySQL递归查询的3种实现方式,文中通过示例代码介绍的非常详细,需要的朋友可以参考下

1.建表脚本

1.1.建表

DROP TABLE IF EXISTS `sys_region`;
CREATE TABLE `sys_region`  (
  `id` int(50) NOT NULL AUTO_INCREMENT COMMENT "地区主键编号",
  `name` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT "地区名称",
  `short_name` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT "简称",
  `code` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT "行政地区编号",
  `parent_code` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT "父id",
  `level` int(2) NULL DEFAULT NULL COMMENT "1级：省、直辖市、自治区
2级：地级市
3级：市辖区、县（旗）、县级市、自治县（自治旗）、特区、林区
4级：镇、乡、民族乡、县辖区、街道
5级：村、居委会",
  `flag` int(1) NULL DEFAULT NULL COMMENT "0:正常 1废弃",
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 182 CHARACTER SET = utf8 COLLATE = utf8_general_ci COMMENT = "地区表" ROW_FORMAT = Dynamic;

1.2.插入数据

INSERT INTO `sys_region` VALUES (1, "山东省", "鲁", "370000000000", NULL, 1, 0);
INSERT INTO `sys_region` VALUES (2, "济南市", "济南", "370100000000", "370000000000", 2, 0);
INSERT INTO `sys_region` VALUES (3, "市辖区", "市辖区", "370101000000", "370100000000", 3, 0);
INSERT INTO `sys_region` VALUES (4, "历下区", "历下区", "370102000000", "370100000000", 3, 0);
INSERT INTO `sys_region` VALUES (5, "市中区", "市中区", "370103000000", "370100000000", 3, 0);
INSERT INTO `sys_region` VALUES (6, "槐荫区", "槐荫区", "370104000000", "370100000000", 3, 0);
INSERT INTO `sys_region` VALUES (7, "天桥区", "天桥区", "370105000000", "370100000000", 3, 0);
INSERT INTO `sys_region` VALUES (8, "历城区", "历城区", "370112000000", "370100000000", 3, 0);
INSERT INTO `sys_region` VALUES (9, "长清区", "长清区", "370113000000", "370100000000", 3, 0);
INSERT INTO `sys_region` VALUES (10, "章丘区", "章丘区", "370114000000", "370100000000", 3, 0);
INSERT INTO `sys_region` VALUES (11, "济阳区", "济阳区", "370115000000", "370100000000", 3, 0);
INSERT INTO `sys_region` VALUES (12, "莱芜区", "莱芜区", "370116000000", "370100000000", 3, 0);
INSERT INTO `sys_region` VALUES (13, "钢城区", "钢城区", "370117000000", "370100000000", 3, 0);
INSERT INTO `sys_region` VALUES (14, "平阴县", "平阴县", "370124000000", "370100000000", 3, 0);
INSERT INTO `sys_region` VALUES (15, "商河县", "商河县", "370126000000", "370100000000", 3, 0);
INSERT INTO `sys_region` VALUES (16, "济南高新技术产业开发区", "高新区", "370171000000", "370100000000", 3, 0);
INSERT INTO `sys_region` VALUES (17, "解放路街道", "解放路街道", "370102001000", "370102000000", 4, 0);
INSERT INTO `sys_region` VALUES (18, "千佛山街道", "千佛山街道", "370102002000", "370102000000", 4, 0);
INSERT INTO `sys_region` VALUES (19, "趵突泉街道", "趵突泉街道", "370102003000", "370102000000", 4, 0);
INSERT INTO `sys_region` VALUES (20, "泉城路街道", "泉城路街道", "370102004000", "370102000000", 4, 0);
INSERT INTO `sys_region` VALUES (21, "大明湖街道", "大明湖街道", "370102005000", "370102000000", 4, 0);
INSERT INTO `sys_region` VALUES (22, "东关街道", "东关街道", "370102006000", "370102000000", 4, 0);
INSERT INTO `sys_region` VALUES (23, "文东街道", "文东街道", "370102007000", "370102000000", 4, 0);
INSERT INTO `sys_region` VALUES (24, "建新街道", "建新街道", "370102008000", "370102000000", 4, 0);
INSERT INTO `sys_region` VALUES (25, "甸柳街道", "甸柳街道", "370102009000", "370102000000", 4, 0);
INSERT INTO `sys_region` VALUES (26, "燕山街道", "燕山街道", "370102010000", "370102000000", 4, 0);
INSERT INTO `sys_region` VALUES (27, "姚家街道", "姚家街道", "370102011000", "370102000000", 4, 0);
INSERT INTO `sys_region` VALUES (28, "龙洞街道", "龙洞街道", "370102012000", "370102000000", 4, 0);
INSERT INTO `sys_region` VALUES (29, "智远街道", "智远街道", "370102013000", "370102000000", 4, 0);
INSERT INTO `sys_region` VALUES (30, "大观园街道", "大观园街道", "370103002000", "370103000000", 4, 0);
INSERT INTO `sys_region` VALUES (31, "杆石桥街道", "杆石桥街道", "370103003000", "370103000000", 4, 0);
INSERT INTO `sys_region` VALUES (32, "四里村街道", "四里村街道", "370103004000", "370103000000", 4, 0);
INSERT INTO `sys_region` VALUES (33, "魏家庄街道", "魏家庄街道", "370103006000", "370103000000", 4, 0);
INSERT INTO `sys_region` VALUES (34, "二七街道", "二七街道", "370103008000", "370103000000", 4, 0);
INSERT INTO `sys_region` VALUES (35, "七里山街道", "七里山街道", "370103009000", "370103000000", 4, 0);
INSERT INTO `sys_region` VALUES (36, "六里山街道", "六里山街道", "370103010000", "370103000000", 4, 0);
INSERT INTO `sys_region` VALUES (37, "舜玉路街道", "舜玉路街道", "370103012000", "370103000000", 4, 0);
INSERT INTO `sys_region` VALUES (38, "泺源街道", "泺源街道", "370103014000", "370103000000", 4, 0);
INSERT INTO `sys_region` VALUES (39, "王官庄街道", "王官庄街道", "370103015000", "370103000000", 4, 0);
INSERT INTO `sys_region` VALUES (40, "舜耕街道", "舜耕街道", "370103016000", "370103000000", 4, 0);
INSERT INTO `sys_region` VALUES (41, "白马山街道", "白马山街道", "370103017000", "370103000000", 4, 0);
INSERT INTO `sys_region` VALUES (42, "七贤街道", "七贤街道", "370103018000", "370103000000", 4, 0);
INSERT INTO `sys_region` VALUES (43, "十六里河街道", "十六里河街道", "370103019000", "370103000000", 4, 0);
INSERT INTO `sys_region` VALUES (44, "兴隆街道", "兴隆街道", "370103020000", "370103000000", 4, 0);
INSERT INTO `sys_region` VALUES (45, "党家街道", "党家街道", "370103021000", "370103000000", 4, 0);
INSERT INTO `sys_region` VALUES (46, "陡沟街道", "陡沟街道", "370103022000", "370103000000", 4, 0);
INSERT INTO `sys_region` VALUES (47, "振兴街街道", "振兴街街道", "370104001000", "370104000000", 4, 0);
INSERT INTO `sys_region` VALUES (48, "中大槐树街道", "中大槐树街道", "370104002000", "370104000000", 4, 0);
INSERT INTO `sys_region` VALUES (49, "道德街街道", "道德街街道", "370104003000", "370104000000", 4, 0);
INSERT INTO `sys_region` VALUES (50, "西市场街道", "西市场街道", "370104004000", "370104000000", 4, 0);
INSERT INTO `sys_region` VALUES (51, "五里沟街道", "五里沟街道", "370104005000", "370104000000", 4, 0);
INSERT INTO `sys_region` VALUES (52, "营市街街道", "营市街街道", "370104006000", "370104000000", 4, 0);
INSERT INTO `sys_region` VALUES (53, "青年公园街道", "青年公园街道", "370104007000", "370104000000", 4, 0);
INSERT INTO `sys_region` VALUES (54, "南辛庄街道", "南辛庄街道", "370104008000", "370104000000", 4, 0);
INSERT INTO `sys_region` VALUES (55, "段店北路街道", "段店北路街道", "370104009000", "370104000000", 4, 0);
INSERT INTO `sys_region` VALUES (56, "张庄路街道", "张庄路街道", "370104010000", "370104000000", 4, 0);
INSERT INTO `sys_region` VALUES (57, "匡山街道", "匡山街道", "370104011000", "370104000000", 4, 0);
INSERT INTO `sys_region` VALUES (58, "美里湖街道", "美里湖街道", "370104012000", "370104000000", 4, 0);
INSERT INTO `sys_region` VALUES (59, "腊山街道", "腊山街道", "370104013000", "370104000000", 4, 0);
INSERT INTO `sys_region` VALUES (60, "兴福街道", "兴福街道", "370104014000", "370104000000", 4, 0);
INSERT INTO `sys_region` VALUES (61, "玉清湖街道", "玉清湖街道", "370104015000", "370104000000", 4, 0);
INSERT INTO `sys_region` VALUES (62, "吴家堡街道", "吴家堡街道", "370104016000", "370104000000", 4, 0);
INSERT INTO `sys_region` VALUES (63, "无影山街道", "无影山街道", "370105001000", "370105000000", 4, 0);
INSERT INTO `sys_region` VALUES (64, "天桥东街街道", "天桥东街街道", "370105003000", "370105000000", 4, 0);
INSERT INTO `sys_region` VALUES (65, "北村街道", "北村街道", "370105004000", "370105000000", 4, 0);
INSERT INTO `sys_region` VALUES (66, "南村街道", "南村街道", "370105005000", "370105000000", 4, 0);
INSERT INTO `sys_region` VALUES (67, "堤口路街道", "堤口路街道", "370105006000", "370105000000", 4, 0);
INSERT INTO `sys_region` VALUES (68, "北坦街道", "北坦街道", "370105007000", "370105000000", 4, 0);
INSERT INTO `sys_region` VALUES (69, "制锦市街道", "制锦市街道", "370105009000", "370105000000", 4, 0);
INSERT INTO `sys_region` VALUES (70, "宝华街道", "宝华街道", "370105010000", "370105000000", 4, 0);
INSERT INTO `sys_region` VALUES (71, "官扎营街道", "官扎营街道", "370105011000", "370105000000", 4, 0);
INSERT INTO `sys_region` VALUES (72, "纬北路街道", "纬北路街道", "370105012000", "370105000000", 4, 0);
INSERT INTO `sys_region` VALUES (73, "药山街道", "药山街道", "370105013000", "370105000000", 4, 0);
INSERT INTO `sys_region` VALUES (74, "北园街道", "北园街道", "370105014000", "370105000000", 4, 0);
INSERT INTO `sys_region` VALUES (75, "泺口街道", "泺口街道", "370105015000", "370105000000", 4, 0);
INSERT INTO `sys_region` VALUES (76, "桑梓店街道", "桑梓店街道", "370105016000", "370105000000", 4, 0);
INSERT INTO `sys_region` VALUES (77, "大桥街道", "大桥街道", "370105017000", "370105000000", 4, 0);
INSERT INTO `sys_region` VALUES (78, "山大路街道", "山大路街道", "370112001000", "370112000000", 4, 0);
INSERT INTO `sys_region` VALUES (79, "洪家楼街道", "洪家楼街道", "370112002000", "370112000000", 4, 0);
INSERT INTO `sys_region` VALUES (80, "东风街道", "东风街道", "370112003000", "370112000000", 4, 0);
INSERT INTO `sys_region` VALUES (81, "全福街道", "全福街道", "370112004000", "370112000000", 4, 0);
INSERT INTO `sys_region` VALUES (82, "华山街道", "华山街道", "370112007000", "370112000000", 4, 0);
INSERT INTO `sys_region` VALUES (83, "荷花路街道", "荷花路街道", "370112008000", "370112000000", 4, 0);
INSERT INTO `sys_region` VALUES (84, "王舍人街道", "王舍人街道", "370112009000", "370112000000", 4, 0);
INSERT INTO `sys_region` VALUES (85, "鲍山街道", "鲍山街道", "370112010000", "370112000000", 4, 0);
INSERT INTO `sys_region` VALUES (86, "郭店街道", "郭店街道", "370112011000", "370112000000", 4, 0);
INSERT INTO `sys_region` VALUES (87, "唐冶街道", "唐冶街道", "370112012000", "370112000000", 4, 0);
INSERT INTO `sys_region` VALUES (88, "港沟街道", "港沟街道", "370112013000", "370112000000", 4, 0);
INSERT INTO `sys_region` VALUES (89, "董家街道", "董家街道", "370112016000", "370112000000", 4, 0);
INSERT INTO `sys_region` VALUES (90, "彩石街道", "彩石街道", "370112017000", "370112000000", 4, 0);
INSERT INTO `sys_region` VALUES (91, "仲宫街道", "仲宫街道", "370112018000", "370112000000", 4, 0);
INSERT INTO `sys_region` VALUES (92, "柳埠街道", "柳埠街道", "370112019000", "370112000000", 4, 0);
INSERT INTO `sys_region` VALUES (93, "唐王街道", "唐王街道", "370112020000", "370112000000", 4, 0);
INSERT INTO `sys_region` VALUES (94, "西营街道", "西营街道", "370112021000", "370112000000", 4, 0);
INSERT INTO `sys_region` VALUES (95, "文昌街道", "文昌街道", "370113001000", "370113000000", 4, 0);
INSERT INTO `sys_region` VALUES (96, "崮云湖街道", "崮云湖街道", "370113002000", "370113000000", 4, 0);
INSERT INTO `sys_region` VALUES (97, "平安街道", "平安街道", "370113003000", "370113000000", 4, 0);
INSERT INTO `sys_region` VALUES (98, "五峰山街道", "五峰山街道", "370113004000", "370113000000", 4, 0);
INSERT INTO `sys_region` VALUES (99, "归德街道", "归德街道", "370113005000", "370113000000", 4, 0);
INSERT INTO `sys_region` VALUES (100, "张夏街道", "张夏街道", "370113006000", "370113000000", 4, 0);
INSERT INTO `sys_region` VALUES (101, "万德街道", "万德街道", "370113007000", "370113000000", 4, 0);
INSERT INTO `sys_region` VALUES (102, "孝里镇", "孝里镇", "370113102000", "370113000000", 4, 0);
INSERT INTO `sys_region` VALUES (103, "马山镇", "马山镇", "370113107000", "370113000000", 4, 0);
INSERT INTO `sys_region` VALUES (104, "双泉镇", "双泉镇", "370113108000", "370113000000", 4, 0);
INSERT INTO `sys_region` VALUES (105, "明水街道", "明水街道", "370114001000", "370114000000", 4, 0);
INSERT INTO `sys_region` VALUES (106, "双山街道", "双山街道", "370114002000", "370114000000", 4, 0);
INSERT INTO `sys_region` VALUES (107, "枣园街道", "枣园街道", "370114003000", "370114000000", 4, 0);
INSERT INTO `sys_region` VALUES (108, "龙山街道", "龙山街道", "370114004000", "370114000000", 4, 0);
INSERT INTO `sys_region` VALUES (109, "埠村街道", "埠村街道", "370114005000", "370114000000", 4, 0);
INSERT INTO `sys_region` VALUES (110, "圣井街道", "圣井街道", "370114006000", "370114000000", 4, 0);
INSERT INTO `sys_region` VALUES (111, "普集街道", "普集街道", "370114007000", "370114000000", 4, 0);
INSERT INTO `sys_region` VALUES (112, "绣惠街道", "绣惠街道", "370114008000", "370114000000", 4, 0);
INSERT INTO `sys_region` VALUES (113, "相公庄街道", "相公庄街道", "370114009000", "370114000000", 4, 0);
INSERT INTO `sys_region` VALUES (114, "文祖街道", "文祖街道", "370114010000", "370114000000", 4, 0);
INSERT INTO `sys_region` VALUES (115, "官庄街道", "官庄街道", "370114011000", "370114000000", 4, 0);
INSERT INTO `sys_region` VALUES (116, "高官寨街道", "高官寨街道", "370114012000", "370114000000", 4, 0);
INSERT INTO `sys_region` VALUES (117, "白云湖街道", "白云湖街道", "370114013000", "370114000000", 4, 0);
INSERT INTO `sys_region` VALUES (118, "宁家埠街道", "宁家埠街道", "370114014000", "370114000000", 4, 0);
INSERT INTO `sys_region` VALUES (119, "曹范街道", "曹范街道", "370114015000", "370114000000", 4, 0);
INSERT INTO `sys_region` VALUES (120, "刁镇", "刁镇", "370114100000", "370114000000", 4, 0);
INSERT INTO `sys_region` VALUES (121, "垛庄镇", "垛庄镇", "370114101000", "370114000000", 4, 0);
INSERT INTO `sys_region` VALUES (122, "黄河镇", "黄河镇", "370114102000", "370114000000", 4, 0);
INSERT INTO `sys_region` VALUES (123, "济阳街道", "济阳街道", "370115001000", "370115000000", 4, 0);
INSERT INTO `sys_region` VALUES (124, "济北街道", "济北街道", "370115002000", "370115000000", 4, 0);
INSERT INTO `sys_region` VALUES (125, "崔寨街道", "崔寨街道", "370115003000", "370115000000", 4, 0);
INSERT INTO `sys_region` VALUES (126, "孙耿街道", "孙耿街道", "370115004000", "370115000000", 4, 0);
INSERT INTO `sys_region` VALUES (127, "回河街道", "回河街道", "370115005000", "370115000000", 4, 0);
INSERT INTO `sys_region` VALUES (128, "太平街道", "太平街道", "370115006000", "370115000000", 4, 0);
INSERT INTO `sys_region` VALUES (129, "垛石镇", "垛石镇", "370115101000", "370115000000", 4, 0);
INSERT INTO `sys_region` VALUES (130, "曲堤镇", "曲堤镇", "370115103000", "370115000000", 4, 0);
INSERT INTO `sys_region` VALUES (131, "仁风镇", "仁风镇", "370115104000", "370115000000", 4, 0);
INSERT INTO `sys_region` VALUES (132, "新市镇", "新市镇", "370115110000", "370115000000", 4, 0);
INSERT INTO `sys_region` VALUES (133, "凤城街道", "凤城街道", "370116001000", "370116000000", 4, 0);
INSERT INTO `sys_region` VALUES (134, "张家洼街道", "张家洼街道", "370116002000", "370116000000", 4, 0);
INSERT INTO `sys_region` VALUES (135, "高庄街道", "高庄街道", "370116003000", "370116000000", 4, 0);
INSERT INTO `sys_region` VALUES (136, "鹏泉街道", "鹏泉街道", "370116004000", "370116000000", 4, 0);
INSERT INTO `sys_region` VALUES (137, "口镇", "口镇", "370116100000", "370116000000", 4, 0);
INSERT INTO `sys_region` VALUES (138, "羊里镇", "羊里镇", "370116101000", "370116000000", 4, 0);
INSERT INTO `sys_region` VALUES (139, "方下镇", "方下镇", "370116102000", "370116000000", 4, 0);
INSERT INTO `sys_region` VALUES (140, "牛泉镇", "牛泉镇", "370116103000", "370116000000", 4, 0);
INSERT INTO `sys_region` VALUES (141, "苗山镇", "苗山镇", "370116104000", "370116000000", 4, 0);
INSERT INTO `sys_region` VALUES (142, "雪野镇", "雪野镇", "370116105000", "370116000000", 4, 0);
INSERT INTO `sys_region` VALUES (143, "大王庄镇", "大王庄镇", "370116106000", "370116000000", 4, 0);
INSERT INTO `sys_region` VALUES (144, "寨里镇", "寨里镇", "370116107000", "370116000000", 4, 0);
INSERT INTO `sys_region` VALUES (145, "杨庄镇", "杨庄镇", "370116108000", "370116000000", 4, 0);
INSERT INTO `sys_region` VALUES (146, "茶业口镇", "茶业口镇", "370116109000", "370116000000", 4, 0);
INSERT INTO `sys_region` VALUES (147, "和庄镇", "和庄镇", "370116110000", "370116000000", 4, 0);
INSERT INTO `sys_region` VALUES (148, "艾山街道", "艾山街道", "370117001000", "370117000000", 4, 0);
INSERT INTO `sys_region` VALUES (149, "里辛街道", "里辛街道", "370117002000", "370117000000", 4, 0);
INSERT INTO `sys_region` VALUES (150, "汶源街道", "汶源街道", "370117003000", "370117000000", 4, 0);
INSERT INTO `sys_region` VALUES (151, "颜庄镇", "颜庄镇", "370117100000", "370117000000", 4, 0);
INSERT INTO `sys_region` VALUES (152, "辛庄镇", "辛庄镇", "370117103000", "370117000000", 4, 0);
INSERT INTO `sys_region` VALUES (153, "棋山国家森林公园", "棋山国家森林公园", "370117400000", "370117000000", 4, 0);
INSERT INTO `sys_region` VALUES (154, "高新技术开发区", "高新技术开发区", "370117401000", "370117000000", 4, 0);
INSERT INTO `sys_region` VALUES (155, "榆山街道", "榆山街道", "370124001000", "370124000000", 4, 0);
INSERT INTO `sys_region` VALUES (156, "锦水街道", "锦水街道", "370124002000", "370124000000", 4, 0);
INSERT INTO `sys_region` VALUES (157, "东阿镇", "东阿镇", "370124102000", "370124000000", 4, 0);
INSERT INTO `sys_region` VALUES (158, "孝直镇", "孝直镇", "370124103000", "370124000000", 4, 0);
INSERT INTO `sys_region` VALUES (159, "孔村镇", "孔村镇", "370124104000", "370124000000", 4, 0);
INSERT INTO `sys_region` VALUES (160, "洪范池镇", "洪范池镇", "370124105000", "370124000000", 4, 0);
INSERT INTO `sys_region` VALUES (161, "玫瑰镇", "玫瑰镇", "370124106000", "370124000000", 4, 0);
INSERT INTO `sys_region` VALUES (162, "安城镇", "安城镇", "370124107000", "370124000000", 4, 0);
INSERT INTO `sys_region` VALUES (163, "许商街道", "许商街道", "370126001000", "370126000000", 4, 0);
INSERT INTO `sys_region` VALUES (164, "殷巷镇", "殷巷镇", "370126101000", "370126000000", 4, 0);
INSERT INTO `sys_region` VALUES (165, "怀仁镇", "怀仁镇", "370126102000", "370126000000", 4, 0);
INSERT INTO `sys_region` VALUES (166, "龙桑寺镇", "龙桑寺镇", "370126104000", "370126000000", 4, 0);
INSERT INTO `sys_region` VALUES (167, "郑路镇", "郑路镇", "370126105000", "370126000000", 4, 0);
INSERT INTO `sys_region` VALUES (168, "贾庄镇", "贾庄镇", "370126106000", "370126000000", 4, 0);
INSERT INTO `sys_region` VALUES (169, "玉皇庙镇", "玉皇庙镇", "370126107000", "370126000000", 4, 0);
INSERT INTO `sys_region` VALUES (170, "白桥镇", "白桥镇", "370126108000", "370126000000", 4, 0);
INSERT INTO `sys_region` VALUES (171, "孙集镇", "孙集镇", "370126109000", "370126000000", 4, 0);
INSERT INTO `sys_region` VALUES (172, "韩庙镇", "韩庙镇", "370126110000", "370126000000", 4, 0);
INSERT INTO `sys_region` VALUES (173, "沙河镇", "沙河镇", "370126111000", "370126000000", 4, 0);
INSERT INTO `sys_region` VALUES (174, "张坊镇", "张坊镇", "370126112000", "370126000000", 4, 0);
INSERT INTO `sys_region` VALUES (175, "舜华路街道", "舜华路街道", "370171001000", "370171000000", 4, 0);
INSERT INTO `sys_region` VALUES (176, "孙村街道", "孙村街道", "370171002000", "370171000000", 4, 0);
INSERT INTO `sys_region` VALUES (177, "巨野河街道", "巨野河街道", "370171003000", "370171000000", 4, 0);
INSERT INTO `sys_region` VALUES (178, "遥墙街道", "遥墙街道", "370171004000", "370171000000", 4, 0);
INSERT INTO `sys_region` VALUES (179, "临港街道", "临港街道", "370171005000", "370171000000", 4, 0);
INSERT INTO `sys_region` VALUES (180, "创新谷街道办事处", "创新谷街道办事处", "370171400000", "370171000000", 4, 0);
INSERT INTO `sys_region` VALUES (181, "章锦街道", "章锦街道", "370171401000", "370171000000", 4, 0);

2.递归查询三种实现方式

2.1. 方式一 创建自定义函数实现递归查询

注意：

1.创建函数的时候，可能会报错。This function has none of DETERMINISTIC 在MySQL安装根目录个人配置文件my.ini中添加一行：log_bin_trust_function_creators=1    然后重启MySQL服务。

2.创建函数的时候用到了系统函数GROUP_CONCAT()，该函数默认长度是1024，在配置文件my.ini 中修改默认长度，添加一行语句：group_concat_max_len=102400    保存后重启MySQL服务。查询sql SELECT @@global.group_concat_max_len;

3.这种方式实现之后，调用简单，但是效率较慢，而且由于字段 、函数、 长度的的限制，数据量大的时候可能查询不全。适合小数据量下使用。

 

2.1.1. 查询子节点的函数 查询时  包含自身

创建函数：

-- 查询子节点的函数  查询时包含自身
CREATE DEFINER=`root`@`localhost` FUNCTION `queryChildren_1_sys_region`(areaId VARCHAR(15)) RETURNS varchar(20000) CHARSET utf8
BEGIN
DECLARE sTemp VARCHAR(20000);
DECLARE sTempChd VARCHAR(20000);
 
SET sTemp="$";
SET sTempChd = areaId;
 
WHILE sTempChd IS NOT NULL DO
 
SET sTemp= CONCAT(sTemp,",",sTempChd);
SELECT GROUP_CONCAT(code) INTO sTempChd FROM sys_region WHERE FIND_IN_SET(parent_code,sTempChd)>0;
 
END WHILE;
RETURN sTemp;
END

查询示例：

-- 子节点 含自己
SELECT * from sys_region where FIND_IN_SET(code,queryChildren_1_sys_region("370000000000"));

MySQL递归查询的3种实现方式实例

 

 2.1.2. 查询子节点的函数 查询时  不包含自身

创建函数： 

-- 查询子节点的函数 查询时  不包含自身
CREATE DEFINER=`root`@`localhost` FUNCTION `queryChildren_sys_region`(areaId VARCHAR(15)) RETURNS varchar(21840) CHARSET utf8
BEGIN
DECLARE sTemp VARCHAR(21840);
DECLARE sTempChd VARCHAR(21840);
 
SET sTemp="$";
SET sTempChd = areaId;
 
WHILE sTempChd IS NOT NULL DO
 
if sTempChd != areaId then 
	SET sTemp= CONCAT(sTemp,",",sTempChd);
end if;
						
SELECT GROUP_CONCAT(code) INTO sTempChd FROM sys_region WHERE FIND_IN_SET(parent_code,sTempChd)>0;
 
END WHILE;
RETURN sTemp;
END

查询示例：

SELECT * from  sys_region where FIND_IN_SET(code,queryChildren_sys_region("370000000000"));

MySQL递归查询的3种实现方式实例

 

 2.1.3.查询父节点  查询的时候  包含自身

创建函数：

-- 查询父节点  查询的时候 包含自身
 
CREATE DEFINER=`root`@`localhost` FUNCTION `queryParent_1_sys_region`(areaId VARCHAR(15)) RETURNS varchar(21840) CHARSET utf8
BEGIN
DECLARE sTemp VARCHAR(21840);
DECLARE sTempChd VARCHAR(21840);
 
SET sTemp="$";
SET sTempChd = areaId;
 
-- SET sTemp = CONCAT(sTemp,",",sTempChd);
-- SELECT IFNULL(parent_code,"") INTO sTempChd FROM tgyi.sys_region  WHERE code = sTempChd;
 
WHILE (sTempChd <> "" ) DO
 
SET sTemp = CONCAT(sTemp,",",sTempChd);
select ifnull((SELECT parent_code FROM tgyi.sys_region  WHERE code = sTempChd),"")  INTO sTempChd ;
 
END WHILE;
 
RETURN sTemp;
END

查询示例：

SELECT * from sys_region where FIND_IN_SET(code,queryParent_1_sys_region("370171401000"));

MySQL递归查询的3种实现方式实例

 

 2.1.4.查询父节点  查询的时候  不包含自身

创建函数：

-- 查询父节点   查询的时候  不包含自身
CREATE DEFINER=`root`@`localhost` FUNCTION `queryParent_sys_region`(areaId VARCHAR(15)) RETURNS varchar(21840) CHARSET utf8
BEGIN
DECLARE sTemp VARCHAR(21840);
DECLARE sTempChd VARCHAR(21840);
 
SET sTemp="$";
SET sTempChd = areaId;
 
-- SET sTemp = CONCAT(sTemp,",",sTempChd);
-- SELECT IFNULL(parent_code,"") INTO sTempChd FROM tgyi.sys_region  WHERE code = sTempChd;
 
WHILE (sTempChd <> "" ) DO
 
if sTempChd != areaId then 
	SET sTemp = CONCAT(sTemp,",",sTempChd);
end if;
 
	
select ifnull((SELECT parent_code FROM tgyi.sys_region  WHERE code = sTempChd),"")  INTO sTempChd ;
 
END WHILE;
 
RETURN sTemp;
END

查询示例：

SELECT * from sys_region where FIND_IN_SET(code,queryParent_sys_region("370171401000"));

MySQL递归查询的3种实现方式实例

 

 2.2. 方式二  单纯使用sql  不创建函数  实现递归

注意：

写法比较复杂，但是适合MySQL各版本，比较灵活。

 

2.2.1.查询子节点  含自己

查询SQL脚本及效果截图：

 
-- 单纯使用SQL递归 查询子节点  含自己
SELECT T2.level_, T3.* 
  FROM( 
	SELECT @codes as _ids, 
			( SELECT @codes := GROUP_CONCAT(code) 
				FROM sys_region 
			   WHERE FIND_IN_SET(parent_code, @codes) 
			) as T1, 
		   @l := @l+1 as level_ 
	  FROM sys_region, 
		  (SELECT @codes :="370000000000", @l := 0 ) T4
	 WHERE @codes IS NOT NULL 
	   ) T2, sys_region T3 
  WHERE FIND_IN_SET(T3.code, T2._ids) 
  ORDER BY level_, code
	;

MySQL递归查询的3种实现方式实例

 

2.2.2.查询子节点  不含自己

查询SQL脚本及效果截图：

-- 单纯使用SQL递归 查询子节点  不含自己
SELECT T2.level_, T3.* 
  FROM( 
	SELECT @codes as _ids, 
			( SELECT @codes := GROUP_CONCAT(code) 
				FROM sys_region 
			   WHERE FIND_IN_SET(parent_code, @codes) 
			) as T1, 
		   @l := @l+1 as level_ 
	  FROM sys_region, 
		  (SELECT @codes :="370000000000", @l := -1 ) T4 
	 WHERE @codes IS NOT NULL 
	   ) T2, sys_region T3 
  WHERE FIND_IN_SET(T3.code, T2._ids) 
	  and code !="370000000000"
  ORDER BY level_, code
	;

MySQL递归查询的3种实现方式实例

 

2.2.3.查询父节点  含自己

查询SQL脚本及效果截图：

-- 单纯使用SQL递归 查询父节点  含自己
SELECT T2.level_, T3.* 
  FROM( 
	SELECT @code as _code, 
			( SELECT @code := parent_code 
				FROM sys_region 
			   WHERE code = @code 
			) as T1, 
		   @l := @l+1 as level_ 
	  FROM sys_region, 
		  (SELECT @code := "370171401000", @l := 0 ) T4 
	 WHERE @code is not null
	) T2, sys_region T3
 WHERE T2._code = T3.code 
 ORDER BY level_
 ;

MySQL递归查询的3种实现方式实例

 

2.2.4.查询父节点  不含自己

查询SQL脚本及效果截图：

 -- 单纯使用SQL递归 查询父节点  不含自己
SELECT T2.level_, T3.* 
  FROM( 
	SELECT @code as _code, 
			( SELECT @code := parent_code 
				FROM sys_region 
			   WHERE code = @code 
			) as T1, 
		   @l := @l+1 as level_ 
	  FROM sys_region, 
		  (SELECT @code := "370171401000", @l := -1 ) T4 
	 WHERE @code is not null
	) T2, sys_region T3
 WHERE T2._code = T3.code 
   and T2._code != "370171401000" 
 ORDER BY level_
 ;

MySQL递归查询的3种实现方式实例

 

 2.3. 方式三   MySQL 8.0 版本以上 使用 WITH RECURSIVE 实现递归 注意：

写法比较简单，也比较灵活，但是只适用于MySQL8.0及以上版本，这种写法其实和  PostgreSQL 的写法是一样的。

 

2.3.1.查询子节点  含自己

查询SQL脚本及效果截图：

 -- 查询子节点  含自己
 WITH RECURSIVE recursion (id, name, short_name, code, parent_code, level, flag) AS
(
  SELECT T1.id, T1.name, T1.short_name, T1.code, T1.parent_code, T1.level, T1.flag  
	  from sys_region T1
	 where T1.code="370000000000"
  UNION ALL
	
  SELECT T2.id, T2.name, T2.short_name, T2.code, T2.parent_code, T2.level, T2.flag 
    from sys_region T2, recursion T3
	 WHERE T2.parent_code=T3.code
)
SELECT T.id, T.name, T.short_name, T.code, T.parent_code, T.level, T.flag  
  FROM recursion T
	;

MySQL递归查询的3种实现方式实例

 

2.3.2.查询子节点  不含自己

查询SQL脚本及效果截图：

 -- 查询子节点   不含自己
 WITH RECURSIVE recursion (id, name, short_name, code, parent_code, level, flag) AS
(
  SELECT T1.id, T1.name, T1.short_name, T1.code, T1.parent_code, T1.level, T1.flag  
	  from sys_region T1
	 where T1.code="370000000000"
  UNION ALL
	
  SELECT T2.id, T2.name, T2.short_name, T2.code, T2.parent_code, T2.level, T2.flag 
    from sys_region T2, recursion T3
	 WHERE T2.parent_code=T3.code
)
SELECT T.id, T.name, T.short_name, T.code, T.parent_code, T.level, T.flag  
  FROM recursion T
 where T.code!="370000000000"
;

MySQL递归查询的3种实现方式实例

 

2.3.3.查询父节点  含自己

查询SQL脚本及效果截图：

 -- 查询父节点  含自己
 WITH RECURSIVE recursion (id, name, short_name, code, parent_code, level, flag) AS
(
  SELECT T1.id, T1.name, T1.short_name, T1.code, T1.parent_code, T1.level, T1.flag  
	  from sys_region T1
	 where T1.code="370171401000"
  UNION ALL
	
  SELECT T2.id, T2.name, T2.short_name, T2.code, T2.parent_code, T2.level, T2.flag 
    from sys_region T2, recursion T3
	 WHERE T2.code=T3.parent_code
)
SELECT T.id, T.name, T.short_name, T.code, T.parent_code, T.level, T.flag  
  FROM recursion T
	;

MySQL递归查询的3种实现方式实例

 

2.3.4.查询父节点  不含自己

查询SQL脚本及效果截图：

 WITH RECURSIVE recursion (id, name, short_name, code, parent_code, level, flag) AS
(
  SELECT T1.id, T1.name, T1.short_name, T1.code, T1.parent_code, T1.level, T1.flag  
	  from sys_region T1
	 where T1.code="370171401000"
  UNION ALL
	
  SELECT T2.id, T2.name, T2.short_name, T2.code, T2.parent_code, T2.level, T2.flag 
    from sys_region T2, recursion T3
	 WHERE T2.code=T3.parent_code
)
SELECT T.id, T.name, T.short_name, T.code, T.parent_code, T.level, T.flag  
  FROM recursion T
	where T.code!="370171401000"
	;

MySQL递归查询的3种实现方式实例

 

总结

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原文地址：https://blog.csdn.net/xubenxismile/article/details/107662209

  • mysql
  • 递归查询

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