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Generating GUID ?

nipper

OK, so I need a unique identifier for data that *may* get dropped in a DB down the road. So I wanted to just create a GUID for each and move on. However it does not appear that iwPerl includes anything to gen a GUID. I can download a PM to do it, but am looking for other options as well, I was thinking of writing a service to generate one but that may not be any faster. Any JS functions I can use ? I plan to use this in FormAPI anyway. Tips/Pointers/RTFMs appreciated

Andy

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Adam Stoller

OK, so I need a unique identifier for data that *may* get dropped in a DB down the road. So I wanted to just create a GUID for each and move on. However it does not appear that iwPerl includes anything to gen a GUID. I can download a PM to do it, but am looking for other options as well, I was thinking of writing a service to generate one but that may not be any faster. Any JS functions I can use ? I plan to use this in FormAPI anyway. Tips/Pointers/RTFMs appreciated

Andy

Do you expect that this may get called more than once a second? If not - then

my $guid = join(q(), localtime());

should work e.g.:

759206910812791
959206910812791
1159206910812791
1259206910812791
...

If you are worried about that - then you could use:

my $guid = join(q(), localtime(), $$);

Which would result in something like:

13221691081279146925
14221691081279146926
16221691081279146927
16221691081279146928
...

Where the last two entries occurred within the same second but the PID (4692x) is different each time the process is called. I don't believe you can use the PID by itself as I think it resets after reboot.
If you're worried that the number (as an integer) is getting too large, use a real number:

my $guid = join(q(), localtime(), '.', $$);

which should result in:

132216910812791.46925
142216910812791.46926
162216910812791.46927
162216910812791.46928
...

Or store the information as a VARCHAR(50) or something like that (the above are 22 characters long, but I think you have to account for the PID getting longer).
I'm sure there's some way that this might not produce a unique value - but I think the chances are pretty slim.

nipper

I ended up using a JS version, since I want to change this on the fly in my template




function S4() {
   return (((1+Math.random())*0x10000)|0).toString(16).substring(1);
}
function guid() {
   return (S4()+S4()+"-"+S4()+"-"+S4()+"-"+S4()+"-"+S4()+S4()+S4());
}