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;

每个人都需要一台速度更快、更稳定的 PC。随着时间的推移,垃圾文件、旧注册表数据和不必要的后台进程会占用资源并降低性能。幸运的是,许多工具可以让 Windows 保持平稳运行。
Copyright 2014-2025 https://www.php.cn/ All Rights Reserved | php.cn | 湘ICP备2023035733号