SELECT
	t.id,
	CASE
WHEN t.parent_id <> 1 THEN
	concat('└─', t.item_name)
ELSE
	t.item_name
END item_name,
 concat(t.parent_id, t.id) AS sorts
FROM
	tb_item t,
	tb_item t1
WHERE
	t.id <> 1
AND t.parent_id = t1.id
ORDER BY
	concat(t.parent_id, t.id)

先贴代码 

表结构如下

CREATE TABLE `tb_item` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'ID',
  `item_name` varchar(200) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '名称',
  `sub_title` varchar(2000) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '副标题',
  `parent_id` bigint(20) DEFAULT '0' COMMENT '父栏目',
  `art_id` bigint(20) DEFAULT NULL COMMENT '',
  `sort` int(4) DEFAULT '0',
  `content` text COLLATE utf8mb4_unicode_ci COMMENT '内容',
  PRIMARY KEY (`id`)
)

 

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