MySQL queries all parents of the current node

 SELECT t2.file_id,t2.ffile_id 
FROM
	(
	SELECT
		@r AS _id,
		( SELECT @r := xxx.file_info.ffile_id FROM xxx.file_info WHERE xxx.file_info.file_id = _id ) AS ffile_id,
		@s := @s + 1 AS sort 
	FROM
		( SELECT @r := 8, @s := 0 ) temp,
		xxx.file_info 
	WHERE
		@r > 0 
	) t1
	JOIN xxx.file_info t2 ON t1._id = t2.file_id ;

notes ： xxx.file_info.ffile_id It's a parent id,xxx.file_info Is the name of the table ,xxx.file_info.file_id At present id
8 It is the present. id, Replace the variable