mysql 更具父类id 查询所有子类id

//创建函数

CREATE FUNCTION getChildeIds(rootId INT)

RETURNS VARCHAR(1000)

BEGIN

DECLARE sTemp VARCHAR(1000);

DECLARE sTempChd VARCHAR(1000);

SET sTemp = '0';
SET sTempChd =cast(rootId as CHAR);

WHILE sTempChd is not null DO
SET sTemp = concat(sTemp,',',sTempChd);
SELECT group_concat(子ID) INTO sTempChd FROM  你的表 where FIND_IN_SET(父id,sTempChd)>0;
END WHILE;
RETURN sTemp;

END

// 应用

select getChildeIds(1);