On 06/09/10 19:09, kmpm wrote:
Regarding UUIDs, one of the business requirements (which I don't
control) is that the identifier that is to be used on barcodes and
what not is to be in the format "YYMMDD" where is the number
we are talking about. So UUID would be great and unique, as well
On Tuesday 07 September 2010 04:46 AM, Mike Dewhirst wrote:
I'm reminded that almost all my own disasters were caused by premature
optimisation.
Seconds that! :-)
I would go with the simplest solution and keep an eye on performance
as it scales. Gives you plenty of time to research plan B.
On Sep 6, 8:40 pm, raj wrote:
> Hi all,
> Why can't we use the aggregate function 'max' from within save()? I
> found it working to find the lot_max from among the objects filtered
> by prod_date and then if lot_max is None, lot_no must be 0, else it's
> just lot_max + 1. I don't know if I've mi
I'm reminded that almost all my own disasters were caused by premature
optimisation.
I would go with the simplest solution and keep an eye on performance as
it scales. Gives you plenty of time to research plan B.
That'll be 2c please
M
On 7/09/2010 4:49am, kmpm wrote:
On Sep 6, 6:52 pm,
On Sep 6, 6:52 pm, Preston Holmes wrote:
>
> what about a simple function that does something as low tech as
> checking a lock file. If you had multiple front end servers, this
> could be a running process on a server using semaphore lock.
>
> -Preston
Sort of thought about that as well.
Meanw
Hi all,
Why can't we use the aggregate function 'max' from within save()? I
found it working to find the lot_max from among the objects filtered
by prod_date and then if lot_max is None, lot_no must be 0, else it's
just lot_max + 1. I don't know if I've misunderstood some requirement
by the way.
On Sep 6, 2:39 am, kmpm wrote:
> First of all to everyone, thanks for all good suggestions so far.
>
> Regarding UUIDs, one of the business requirements (which I don't
> control) is that the identifier that is to be used on barcodes and
> what not is to be in the format "YYMMDD" where i
For anyone listening in...
the ticket http://code.djangoproject.com/ticket/2705 might also be
worth looking at
On Sep 6, 11:39 am, kmpm wrote:
> > UUIDs are your best bet. Even if you generated 100 billion UUIDs a
> > second for the next 100 years, the chance of one collision would only
> > be 50
>
> UUIDs are your best bet. Even if you generated 100 billion UUIDs a
> second for the next 100 years, the chance of one collision would only
> be 50% [1].
>
> class ProducedEntity(models.Model):
>
> uuid = models.CharField(max_length=36, unique=True)
>
> def _hook_add_uuid(instance,
On Mon, Sep 6, 2010 at 7:19 AM, kmpm wrote:
> I have a project running in a manufacturing industry that is actually
> built upon django.
> In this I need to generate a unique serial, batch or lot number
> (depending on what you would like to call it) that is a running number
> from 0 to whathever
On 6/09/2010 5:38 PM, kmpm wrote:
On Sep 6, 9:02 am, Mike Dewhirst wrote:
On 6/09/2010 4:19pm, kmpm wrote:
I have a project running in a manufacturing industry that is actually
built upon django.
In this I need to generate a unique serial, batch or lot number
(depending on what you would like
On Sep 6, 8:38 am, kmpm wrote:
> On Sep 6, 9:02 am, Mike Dewhirst wrote:
>
>
>
>
>
> > On 6/09/2010 4:19pm, kmpm wrote:
>
> > > I have a project running in a manufacturing industry that is actually
> > > built upon django.
> > > In this I need to generate a unique serial, batch or lot number
> >
On Sep 6, 9:02 am, Mike Dewhirst wrote:
> On 6/09/2010 4:19pm, kmpm wrote:
>
> > I have a project running in a manufacturing industry that is actually
> > built upon django.
> > In this I need to generate a unique serial, batch or lot number
> > (depending on what you would like to call it) that i
On 6/09/2010 4:19pm, kmpm wrote:
I have a project running in a manufacturing industry that is actually
built upon django.
In this I need to generate a unique serial, batch or lot number
(depending on what you would like to call it) that is a running number
from 0 to whathever for each and every d
I have a project running in a manufacturing industry that is actually
built upon django.
In this I need to generate a unique serial, batch or lot number
(depending on what you would like to call it) that is a running number
from 0 to whathever for each and every day.
There is a high risk of concurr
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