目录
一、环境
二、准备数据
/*
Navicat PGsql Data Transfer
Source Server : localhost_postgresql
Source Server Version : 90617
Source Host : localhost:5432
Source Database : odc_test
Source Schema : public
Target Server Type : PGsql
Target Server Version : 90617
File Encoding : 65001
Date: 2021-04-30 22:22:15
*/
-- ----------------------------
-- Table structure for sys_area
-- ----------------------------
DROP TABLE IF EXISTS "public"."sys_area";
CREATE TABLE "public"."sys_area" (
"id" int8 NOT NULL,
"name" varchar(100) COLLATE "default" NOT NULL,
"parent_id" int8
)
WITH (OIDS=FALSE)
;
-- ----------------------------
-- Records of sys_area
-- ----------------------------
INSERT INTO "public"."sys_area" VALUES ('1', '重庆市', null);
INSERT INTO "public"."sys_area" VALUES ('2', '渝中区', '1');
INSERT INTO "public"."sys_area" VALUES ('3', '九龙坡区', '1');
INSERT INTO "public"."sys_area" VALUES ('4', '开州区', '1');
INSERT INTO "public"."sys_area" VALUES ('5', '渝北区', '1');
INSERT INTO "public"."sys_area" VALUES ('6', '两江新区', '1');
INSERT INTO "public"."sys_area" VALUES ('7', '石桥铺街道', '3');
INSERT INTO "public"."sys_area" VALUES ('8', '二郎街道', '3');
INSERT INTO "public"."sys_area" VALUES ('9', '大进镇', '4');
-- ----------------------------
-- Alter Sequences Owned By
-- ----------------------------
-- ----------------------------
-- Primary Key structure for table sys_area
-- ----------------------------
ALTER TABLE "public"."sys_area" ADD PRIMARY KEY ("id");三、根据父节点ID获取所有子节点
WITH RECURSIVE cte AS (
SELECT
n. ID,
n. NAME,
n.parent_id AS pid
FROM
sys_area AS n
WHERE
n. ID = 1
UNION ALL
SELECT
r. ID,
r. NAME,
cte. ID AS pid
FROM
cte
JOIN sys_area AS r ON r.parent_id = cte. ID
) SELECT
*
FROM
cte结果信息：
四、根据子节点获取所有的父节点
WITH RECURSIVE cte AS (
SELECT
n. ID,
n. NAME,
n.parent_id AS pid
FROM
sys_area AS n
WHERE
n. NAME LIKE '%二郎%'
UNION ALL
SELECT
r. ID,
r. NAME,
r.parent_id AS pid
FROM
cte
JOIN sys_area AS r ON cte.pid = r. ID
) SELECT
*
FROM
cte结果信息：
