mysql存储过程遍历树例子

– Table structure for treenodes

DROP TABLE IF EXISTS

treenodes

;

CREATE TABLE

treenodes

(

id

int(11) NOT NULL,

nodename

varchar(20) DEFAULT NULL,

pid

int(11) DEFAULT NULL,

PRIMARY KEY (

id

)

) ENGINE=MyISAM DEFAULT CHARSET=latin1;

– Records of treenodes

INSERT INTO

treenodes

VALUES (‘1’, ‘A’, ‘0’);

INSERT INTO

treenodes

VALUES (‘2’, ‘B’, ‘1’);

INSERT INTO

treenodes

VALUES (‘3’, ‘C’, ‘1’);

INSERT INTO

treenodes

VALUES (‘4’, ‘D’, ‘2’);

INSERT INTO

treenodes

VALUES (‘5’, ‘E’, ‘2’);

INSERT INTO

treenodes

VALUES (‘6’, ‘F’, ‘3’);

INSERT INTO

treenodes

VALUES (‘7’, ‘G’, ‘6’);

INSERT INTO

treenodes

VALUES (‘8’, ‘H’, ‘0’);

INSERT INTO

treenodes

VALUES (‘9’, ‘I’, ‘8’);

INSERT INTO

treenodes

VALUES (‘10’, ‘J’, ‘8’);

INSERT INTO

treenodes

VALUES (‘11’, ‘K’, ‘8’);

INSERT INTO

treenodes

VALUES (‘12’, ‘L’, ‘9’);

INSERT INTO

treenodes

VALUES (‘13’, ‘M’, ‘9’);

INSERT INTO

treenodes

VALUES (‘14’, ‘N’, ‘12’);

INSERT INTO

treenodes

VALUES (‘15’, ‘O’, ‘12’);

INSERT INTO

treenodes

VALUES (‘16’, ‘P’, ‘15’);

INSERT INTO

treenodes

VALUES (‘17’, ‘Q’, ‘15’);

DROP FUNCTION IF EXISTS

getChildLst

;

DELIMITER ;;

CREATE DEFINER=

root

@

localhost

FUNCTION

getChildLst

(rootId INT) RETURNS varchar(1000) CHARSET utf8

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

;;

DELIMITER ;

用法

select * from treenodes WHERE FIND_IN_SET( id, getChildLst( 2 ) )

原文：http://blog.csdn.net/ACMAIN_CHM/article/details/4142971