mysql 递归查询父节点 和子节点

Posted 2020-10-06 卓扬

查父集合

--drop FUNCTION `getParentList`  
CREATE FUNCTION `getParentList`(rootId varchar(100))   
RETURNS varchar(1000)   
BEGIN   
DECLARE fid varchar(100) default ‘‘;   
DECLARE str varchar(1000) default rootId;   
  
WHILE rootId is not null  do   
    SET fid =(SELECT parentid FROM treeNodes WHERE id = rootId);   
    IF fid is not null THEN   
        SET str = concat(str, ‘,‘, fid);   
        SET rootId = fid;   
    ELSE   
        SET rootId = fid;   
    END IF;   
END WHILE;   
return str;  
END 

查询语句

select getParentList(‘001001001001001‘);   
  
select * from sbkfwh where FIND_IN_SET(id,getParentList(‘001001001001002‘))   

 

查子集合

--drop FUNCTION `getChildList`  
CREATE FUNCTION `getChildList`(rootId varchar(100))   
RETURNS varchar(2000)  
BEGIN   
DECLARE str varchar(2000);  
DECLARE cid varchar(100);   
SET str = ‘$‘;   
SET cid = rootId;   
WHILE cid is not null DO   
    SET str = concat(str, ‘,‘, cid);   
    SELECT group_concat(id) INTO cid FROM treeNodes where FIND_IN_SET(parentid, cid) > 0;   
END WHILE;   
RETURN str;   
END  

查询语句

select getParentList(‘001001001‘);   
select * from sbkfwh where FIND_IN_SET(id,getChildList(‘001001001‘))