Example: While - Endwhile

In the following While-Endwhile statement example, this database procedure, delete_n_rows, accepts as input a base number and a number of rows. The specified rows are deleted from the table "tab," starting from the base number. If an error occurs, the loop terminates:

create procedure delete_n_rows
      (base integer, n integer) as
declare
limit integer;
      err integer;
begin
      limit = base + n;
      err = 0;
      while (base < limit) do
            delete from tab where val = :base;
            if iierrornumber > 0 then
                  err = 1;
                  endloop;
            endif;
            base = base + 1;
      endwhile;
      return :err;
end