MySQL - Recursive query with recursive concatenation

Question

My table structure:

id | name      | parent_id
0  | "name0"   | NULL
1  | "name1"   | 0
2  | "name2"   | 1
...

I need something like:

id | full_path
2  | "name0|name1|name2"

2 is specified by user; path's length is unknown. How can do produce something like this with MySQL?

Answer 1

select id,(select  GROUP_CONCAT(CONCAT(name) SEPARATOR '|') as full_path from test ) 
full_path from test where id=2