How to get parents up to 5 level hierarchy from child id - sql

Question

I created a table with name "content_folder" and inserted values just like this.
cf_id cf_parent_id cf_name
--------------------------------------
1 0 root
2 1 US Blenders
3 2 US Blenders Chil11
4 1 Australian Blenderss
5 1 US Blenders Chil11 -2
40003 1 Child
40206 1 Child 111
40211 2 New
I want to display the folder hierarchy for 5 levels sepereated by '>' in drop drown so I wanted the result in following way
cf_id path
--------------------------------------
1 root
2 US Blenders
3 US Blenders > US Blenders Chil11
4 Australian Blenderss
5 US Blenders Chil11 -2
40003 Child
40206 Child 111
40211 US Blenders > New
I tried by writing following query but output result is not proper.
SELECT t.cf_id,
Group_concat(anc.cf_name ORDER BY anc.cf_name SEPARATOR ' > ') AS path
FROM content_folder AS t
JOIN content_folder AS anc
ON t.cf_name LIKE Concat(anc.cf_name, '%')
GROUP BY t.cf_id;
Can you please suggest me better solution. I am working on MySQL 5.7 so I think CTEs are not supported in this version.

Answer 1

I had done something like this with my database. Here is how i did it, i changed a few things and added the two update statements at the end to get your desired output, but i think you will get the gist of whats going on:
DECLARE #temp TABLE
(
id INT,
parent_id INT,
name NVARCHAR(100),
path NVARCHAR(MAX)
)
INSERT INTO #temp (id,parent_id,name) VALUES
(1,0,'root'),
(2,1,'US Blenders'),
(3,2,'US Blenders Chil11'),
(4,1,'Australian Blenderss'),
(5,1,'US Blenders Chil11 -2'),
(40003,1,'Child'),
(40206,1,'Child 111'),
(40211,2,'New')
DECLARE #counter TABLE ( id INT )
DECLARE #current_id INT;
DECLARE #loc_id INT;
INSERT INTO #counter SELECT id FROM #temp
SELECT * FROM #temp
WHILE (SELECT COUNT(*) FROM #counter) > 0
BEGIN
SET #current_id = (SELECT TOP 1 id FROM #counter)
SET #loc_id = (SELECT parent_id FROM #temp WHERE id = #current_id)
WHILE #loc_id IS NOT NULL AND #loc_id != 0
BEGIN
UPDATE #temp
SET path = ' > ' + (SELECT name FROM #temp WHERE id = #loc_id) + CASE WHEN path IS NULL THEN '' ELSE path END
WHERE id = #current_id
SET #loc_id = (SELECT parent_id FROM #temp WHERE id = #loc_id)
END
DELETE FROM #counter
WHERE id = #current_id
END
UPDATE #temp
SET path = REPLACE(REPLACE(path,' > root',''),' > ','')
UPDATE #temp
SET path = CASE WHEN LEN(path) > 0 THEN path + ' > ' + name ELSE name END
SELECT * FROM #temp
OUTPUT:
id parent_id name path
1 0 root root
2 1 US Blenders US Blenders
3 2 US Blenders Chil11 US Blenders > US Blenders Chil11
4 1 Australian Blenderss Australian Blenderss
5 1 US Blenders Chil11 -2 US Blenders Chil11 -2
40003 1 Child Child
40206 1 Child 111 Child 111
40211 2 New US Blenders > New