【数据库-MySql】函数-遍历一个表，并修改状态

BEGIN
declare prehisid varchar(50);
declare prehisid2 varchar(50);
declare recordNum int;
declare ListCount int;
declare iRow int;
declare iRow2 int;
-- 获取处方表的行数 --
select count(*)  into ListCount from prescription ;
set iRow = 1;

-- 遍历处方表 --
WHILE (iRow <= ListCount) do
set iRow2 = iRow-1;

-- 获取处方表的HIS id --
SELECT PRESCRIPTION_HIS_ID into prehisid  from prescription ORDER BY PRESCRIPTION_HIS_ID LIMIT iRow2,iRow;
if prehisid is not null THEN
-- 获取状态表的处方hisid 和 相同处方hisid个数 --
select count(*) ,prescriptionhisid into recordNum,prehisid2 from rcaccept where prescriptionhisid=PreHisId  limit 1;
-- 存在则更新（恢复原始状态） ，不存在则插入 --
if(recordNum > 0) then
update rcaccept rc set rc.bybs=0 where prescriptionhisid= prehisid2;
else
insert into rcaccept(prescriptionhisid,bybs)values(PreHisId,0);
end if;
end if;
set	iRow = iRow+1;
end while;
END