在MYSQL中用一条SQL查询出ID ,NAME,父ID，父NAME; 表结构为：ID NAME P_ID

创建一个function getChildLst, 得到一个由所有子节点号组成的字符串.

mysql> delimiter //
mysql>
mysql> CREATE FUNCTION `getChildLst`(rootId INT)
-> RETURNS varchar(1000)
-> BEGIN
-> DECLARE sTemp VARCHAR(1000);
-> DECLARE sTempChd VARCHAR(1000);
->
-> SET sTemp = '$';
-> SET sTempChd =cast(rootId as CHAR);
->
-> WHILE sTempChd is not null DO
-> SET sTemp = concat(sTemp,',',sTempChd);
-> SELECT group_concat(id) INTO sTempChd FROM treeNodes where FIND_IN_SET(pid,sTempChd)>0;
-> END WHILE;
-> RETURN sTemp;
-> END
-> //
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> delimiter ;

使用我们直接利用find_in_set函数配合这个getChildlst来查找

mysql> select getChildLst(1);
+-----------------+
| getChildLst(1) |
+-----------------+
| $,1,2,3,4,5,6,7 |
+-----------------+
1 row in set (0.00 sec)

select b.id,b.name,a.id,a.name from
test a,test b where
a.id=b.p_id

表名test，自己换一下你自己的表名