我有两个mysql表：节点和关系

CREATE TABLE `nodes` (
  `id` int(10) unsigned NOT NULL auto_increment,PRIMARY KEY  (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE `relations` (
  `node_id` int(10) unsigned NOT NULL,`related_node_id` int(10) unsigned NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

假设节点中有四行：节点1和2共享一个关系,节点2和3,1和4,4和3

INSERT INTO `relations` VALUES (1,2);
INSERT INTO `relations` VALUES (2,3);
INSERT INTO `relations` VALUES (1,4);
INSERT INTO `relations` VALUES (4,3);

是否有任何算法可以获取相关节点之间的路径？喜欢

+---------+------------------+---------+
| node_id | related_node_id  | route   |
+---------+------------------+---------+
|       1 |                2 | 1/2     |
|       2 |                3 | 2/3     |
|       1 |                4 | 1/4     |
|       4 |                3 | 4/3     |
|       1 |                3 | 1/2/3   |
|       1 |                3 | 1/4/3   |
+---------+-----------+------+---------+