表数据

查询结果

{
	"电器": [{
		"1": [{
			"parent_id": "1",
			"parent_name": "家用电器",
			"son_id": "3",
			"son_name": "大家电"
		} {
			"parent_id": "1",
			"parent_name": "家用电器",
			"son_id": "4",
			"son_name": "生活电器"
		}]
	} {
		"2": [{
			"parent_id": "2",
			"parent_name": "电脑办公",
			"son_id": "9",
			"son_name": "电脑整机"
		} {
			"parent_id": "2",
			"parent_name": "电脑办公",
			"son_id": "10",
			"son_name": "电脑配件"
		}]
	} {
		"3": [{
			"parent_id": "3",
			"parent_name": "大家电",
			"son_id": "5",
			"son_name": "平板电视"
		} {
			"parent_id": "3",
			"parent_name": "大家电",
			"son_id": "6",
			"son_name": "空调"
		}]
	} {
		"4": [{
			"parent_id": "4",
			"parent_name": "生活电器",
			"son_id": "7",
			"son_name": "电风扇"
		} {
			"parent_id": "4",
			"parent_name": "生活电器",
			"son_id": "8",
			"son_name": "饮水机"
		}]
	} {
		"9": [{
			"parent_id": "9",
			"parent_name": "电脑整机",
			"son_id": "11",
			"son_name": "笔记本"
		} {
			"parent_id": "9",
			"parent_name": "电脑整机",
			"son_id": "12",
			"son_name": "超极本"
		} {
			"parent_id": "9",
			"parent_name": "电脑整机",
			"son_id": "13",
			"son_name": "游戏本"
		}]
	} {
		"10": [{
			"parent_id": "10",
			"parent_name": "电脑配件",
			"son_id": "14",
			"son_name": "CPU"
		} {
			"parent_id": "10",
			"parent_name": "电脑配件",
			"son_id": "15",
			"son_name": "主机"
		}]
	}]
}

创建数据

CREATE TABLE `table_goods_type` (
  `type_id` smallint(5) unsigned NOT NULL AUTO_INCREMENT,
  `type_name` varchar(20) NOT NULL,
  `parent_id` smallint(5) unsigned NOT NULL DEFAULT '0',
  PRIMARY KEY (`type_id`)
) ENGINE=InnoDB AUTO_INCREMENT=16 DEFAULT CHARSET=utf8;

insert  into `table_goods_type`(`type_id`,`type_name`,`parent_id`) values 
(1,'家用电器',0),
(2,'电脑办公',0),
(3,'大家电',1),
(4,'生活电器',1),
(5,'平板电视',3),
(6,'空调',3),
(7,'电风扇',4),
(8,'饮水机',4),
(9,'电脑整机',2),
(10,'电脑配件',2),
(11,'笔记本',9),
(12,'超极本',9),
(13,'游戏本',9),
(14,'CPU',10),
(15,'主机',10);

查询方法

SELECT CONCAT("{\"电器\":[",GROUP_CONCAT(a.msg),"]}") FROM 
(SELECT a.parent_id, CONCAT("{\"",parent_id,"\":[",GROUP_CONCAT(a.msg),"]}") msg   FROM 
(
SELECT 
DISTINCT
parent.type_id parent_id,
GROUP_CONCAT(
"{"
"\"parent_id\":\"",parent.type_id,"\",",
"\"parent_name\":\"",parent.type_name,"\",",
"\"son_id\":\"",son.type_id,"\",",
"\"son_name\":\"",son.type_name,"\"","}") msg
FROM table_goods_type son
     LEFT JOIN table_goods_type  parent
     ON son.parent_id = parent.type_id 
 WHERE parent.type_id IS NOT NULL GROUP BY son.type_id
)a GROUP BY a.parent_id
)a