how to split a string in stored procedure of DB2

Question

I need split a string in DB2, my string is for example:

2660____,275____,10472316, ...

I need a loop to get all of the them, I know exists FOR in stored procedure DB2, But I can't use that

I write that for example:

FOR i AS mycursor CURSOR FOR SELECT SUBSTR(list, 1, LOCATE(',',list)-1) FROM SYSIBM.SYSDUMMY1 do
    ...
END FOR;

But that doesn't work.

thanks