关于mysql和SqlServer存储过程的转化问题，因为mysql接触得不多，希望高手能帮忙转化下，急用！！

CREATE PROCEDURE changezt( mess char(10) output)
begin

declare zt varchar(1);
declare ddbh varchar(14);
declare yingf float;
declare shif float;
declare tag int;
declare ztai varchar(3);

set tag=0;

declare zt_cursor cursor for select CGDD_BH,CGDD_ZT,CGDD_YFK,CGDD_SFK from cgdd_table
open zt_cursor;
fetch zt_cursor into ddbh,zt,yingf,shif;
while (fetch_status=0)
begin

select max(CGDD_BH),max(CGDD_YFK),max(CGDD_SFK),max(CGDD_ZT) into ddbh,yingf,shif,ztai from cgdd_table;
set zt=substring(ztai,3,1);

if(shif<0)
begin
set tag=1;
set mess='应付款不能为负数！';
end
else if(yingfbegin
select mess='实付款应小于或等于应付款！';
set tag=1;
end
else
fetch zt_cursor into ddbh,zt,yingf,shif;
end;
close zt_cursor

if tag=0
begin

open zt_cursor
fetch next from zt_cursor into ddbh,zt,yingf,shif;

while (fetch_status=0)
select max(CGDD_BH),max(CGDD_YFK),max(CGDD_SFK),max(CGDD_ZT) into ddbh,yingf,shif,ztai from cgdd_table;

begin
if (yingf=0) set zt=0;
if (yingf>shif) set zt=1;
if (yingf=shif) set zt=2;

set ztai=substring(ztai,1,2)+zt;
start transaction;
update cgdd_table set CGDD_ZT=ztai where cgdd_table=ddbh;
fetch next from zt_cursor into ddbh,zt,yingf,shif;

end;
end;

close dwl_cursor;
commit;

end