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An example of MySQL cursor
(Publish Date: 2009-9-25 10:52am, Total Visits: 24924, Today: 2, This Week: 6, This Month: 13)

An example of MySQL nested cursor loops:

00    begin
01        declare no_more_rows boolean default false;
02        declare v_col1       int;
03        declare v_col2       int;
04        declare cursor1 cursor for
05            select col1
06            from   MyTable
07            ;
08        declare cursor2 cursor for
09            select col2
10            from   MyOtherTable
11            where  ref_id = v_col1;
12        declare continue handler for not found
13            set v_done := true;
14   
15        open cursor1;
16        LOOP1: loop
17            fetch cursor1 into v_col1;
18            if v_done then
19                close cursor1;
20                leave LOOP1;
21            end if;
22            open cursor2;
23            LOOP2: loop
24                fetch cursor2 into v_col2;
25                if v_done then
26                    set v_done := false;
27                    close cursor2;
28                    leave LOOP2;
29                end if;
30            end loop LOOP2;
31        end loop LOOP1;
32    end;
From: 
http://rpbouman.blogspot.com/2005/10/nesting-mysql-cursor-loops.html