MySql中创建function

 在MySql workbench中输入下面语句，创建function

delimiter //
CREATE FUNCTION `getChildrenList`(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 organization where FIND_IN_SET(pid,sTempChd)>0;
END WHILE;
RETURN sTemp;
END

下面是使用function 

select * from organization where FIND_IN_SET(id,getChildrenList(0))