MySQL 获取无限级某级的全路径

传递参数：文件夹ID

DROP FUNCTION IF EXISTS RecursionFolderFullPath;

CREATE FUNCTION RecursionFolderFullPath(folderId INT(11)) 
RETURNS VARCHAR(1000)
BEGIN
declare fullPath VARCHAR(1000) default '';
declare parentId INT(11) default '0';

select concat(folder_name,'/',fullPath),folder_parent_id into fullPath,parentId
from folder 
where folder_id=folderId;

WHILE parentId > 0 DO
select concat(folder_name,'/',fullPath),folder_parent_id into fullPath,parentId
from folder 
where folder_id=parentId;
END WHILE;

return fullPath; 
END;

调用：

 select RecursionFolderFullPath(67); 

结果：