MySQL 获取无限级某级的全路径

 1 DROP FUNCTION IF EXISTS RecursionFolderFullPath;
 2 
 3 CREATE FUNCTION RecursionFolderFullPath(folderId INT(11)) 
 4 RETURNS VARCHAR(1000)
 5 BEGIN
 6 declare fullPath VARCHAR(1000) default '';
 7 declare parentId INT(11) default '0';
 8 
 9 select concat(folder_name,'/',fullPath),folder_parent_id into fullPath,parentId
10 from folder 
11 where folder_id=folderId;
12 
13 WHILE parentId > 0 DO
14 select concat(folder_name,'/',fullPath),folder_parent_id into fullPath,parentId
15 from folder 
16 where folder_id=parentId;
17 END WHILE;
18 
19 return fullPath; 
20 END;