MySQL 递归排序查询+树节点生成

mysql 递归排序查询 备注：producttype 排序表，producttype。ptype父节点 ，producttype 。id 主键，showTreeNodes (IN rooti

mysql 递归排序查询

备注：producttype 排序表，producttype。ptype父节点 ，producttype 。id 主键，showTreeNodes (IN rootid INT) 函数，，参数为起始类型rootid.

drop PROCEDURE IF EXISTS showTreeNodes;

CREATE PROCEDURE showTreeNodes (IN rootid INT)
BEGIN
DECLARE Level int ;
drop TABLE IF EXISTS tmpLst;
CREATE TABLE tmpLst (
id int,
nLevel int,
sCort varchar(8000)
);
Set Level=0 ;
INSERT into tmpLst SELECT id,Level,ID FROM producttype WHERE ptype=rootid;
WHILE ROW_COUNT()>0 DO
SET Level=Level+1 ;
INSERT into tmpLst
SELECT A.ID,Level,concat(B.sCort,A.ID) FROM producttype A,tmpLst B
WHERE A.ptype=B.ID AND B.nLevel=Level-1 ;
END WHILE;
END;
CALL showTreeNodes(-1);

SELECT concat(SPACE(B.nLevel*2),'┕',A.name)
FROM producttype A,tmpLst B
WHERE A.ID=B.ID
ORDER BY B.sCort;