drop procedure if exists pro;
drop table if exists data;

set @@max_sp_recursion_depth = 100;-- 设置递归深度
create table data(ans varchar(100));
create procedure pro(in n int)
begin
	if n <> 1 and n <> 145 then
		set @sum = 0, @s = ‘‘;
		while n <> 0 do
			set @a = n % 10, @sum = @sum + @a * @a, n = n div 10;
			set @s = concat(@s,@a*@a);
			if n <> 0 then
				set @s = concat(@s,‘+‘);
			end if;
		end while;
		set @s = concat(@s,‘=‘,@sum);
		insert into data values(@s);
		call pro(@sum);-- 递归调用
	end if;
end;

delimiter ;
call pro(12345);
select * from data;