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create table treeNodes
(
id int primary key,
nodename varchar(20),
pid int
);
CREATE FUNCTION `getChildLst`(rootId INT)
RETURNS varchar(1000)
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
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