From: Raphael Clancy <raphael.clancy@...>
Date: 2009-02-15T01:06:03+09:00
Subject: Re: uniuq no

Vetrivel Vetrivel wrote:
> I want to create new unique id in ruby.I have used the following
> coding.But I don''t know whether it works perfectly or not.
> 
>  t = Time.new
>  p "%10.5f" % t.to_f
> 
> does it give unique value always.I you know some other way ,please say
> to create unique id .

How about something like this...
count = 0
t = Time.now.to_s
10000.times {
  if( t == Time.now.to_s)
    count = count + 1
  else
    count = 0
    t = Time.now.to_s
  end
  uniqid = t + "." + count.to_s
  puts uniqid
}

That way you don't have to worry about rounding, or the possibility that 
the same random number might come up twice. The only real problem with 
this scheme is that on a very fast computer it might be possible to 
generate more ids each second than will fit in an Int. But, Bignum might 
be able to help there...
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