mysql递归查询（父级，...未完待续）

表：

先给表船舰函数：

 1 CREATE FUNCTION `getParentList`(rootId varchar(100))   
 2 RETURNS varchar(1000)   
 3 BEGIN   
 4 DECLARE fid varchar(100) default '';   
 5 DECLARE str varchar(1000) default rootId;   
 6   
 7 WHILE rootId is not null  do   
 8     SET fid =(SELECT PID FROM DIGUI WHERE ID = rootId);   
 9     IF fid is not null THEN   
10         SET str = concat(str, ',', fid);      
11         SET rootId = fid;   
12     ELSE   
13         SET rootId = fid;   
14     END IF;   
15 END WHILE;   
16 return str;  
17 END

然后可以查询父级了：

1 SELECT
2     *
3 FROM
4     digui
5 WHERE
6     FIND_IN_SET(id, getParentList('9'))