• Open Menu Close Menu
  • Apple
  • Shopping Bag
  • Apple
  • Mac
  • iPad
  • iPhone
  • Watch
  • TV
  • Music
  • Support
  • Search apple.com
  • Shopping Bag

Lists

Open Menu Close Menu
  • Terms and Conditions
  • Lists hosted on this site
  • Email the Postmaster
  • Tips for posting to public mailing lists
Re: Back with weird problems: PK generation keeps generating same PK... up to a moment.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Back with weird problems: PK generation keeps generating same PK... up to a moment.


  • Subject: Re: Back with weird problems: PK generation keeps generating same PK... up to a moment.
  • From: "ocs.cz" <email@hidden>
  • Date: Tue, 19 May 2015 23:24:11 +0200

Chuck,

> On 19 5 2015, at 11:13 pm, Chuck Hill <email@hidden> wrote:
>
>> Well then, what if I, at the moment any EO gets inserted into an EC, immediatelly called permanentGlobalID for it?
>
> The original problem was caused, as best I can call, by FrontBase vending the same sequence number twice.

Which itself was (probably, far as I can say) caused by an exception during a transaction (namely, an exception triggered by an UNIQUE constraint) and rollback.

As always, I might be overlooking something of importance, but it seemed me that simple permanentGlobalID-triggered get-me-next-PK roundtrip would never ever cause an exception. The UNIQUE thing of course might cause an exception essentially any time -- *but*, when this happens, the PK will be already assigned, committed and safe. Thus it seemed to me...

> Doing what you describe won’t change or avoid that underlying problem.  It will just change when it happens.

... it actually would avoid the problem -- by separating “a transaction during which a PK gets assigned” from “a transaction which might be aborted by the UNIQUE exception“.

But of course I might be missing some important point?

Thanks a big lot for all the help,
OC


 _______________________________________________
Do not post admin requests to the list. They will be ignored.
Webobjects-dev mailing list      (email@hidden)
Help/Unsubscribe/Update your Subscription:

This email sent to email@hidden


  • Follow-Ups:
    • Re: Back with weird problems: PK generation keeps generating same PK... up to a moment.
      • From: Chuck Hill <email@hidden>
References: 
 >Back with weird problems: PK generation keeps generating same PK... up to a moment. (From: OC <email@hidden>)
 >Re: Back with weird problems: PK generation keeps generating same PK... up to a moment. (From: Chuck Hill <email@hidden>)
 >Re: Back with weird problems: PK generation keeps generating same PK... up to a moment. (From: Samuel Pelletier <email@hidden>)
 >Re: Back with weird problems: PK generation keeps generating same PK... up to a moment. (From: OC <email@hidden>)
 >Re: Back with weird problems: PK generation keeps generating same PK... up to a moment. (From: Samuel Pelletier <email@hidden>)
 >Re: Back with weird problems: PK generation keeps generating same PK... up to a moment. (From: Chuck Hill <email@hidden>)
 >Re: Back with weird problems: PK generation keeps generating same PK... up to a moment. (From: "ocs.cz" <email@hidden>)
 >Re: Back with weird problems: PK generation keeps generating same PK... up to a moment. (From: Chuck Hill <email@hidden>)

  • Prev by Date: Ajax & Servlet Deployment
  • Next by Date: Re: Back with weird problems: PK generation keeps generating same PK... up to a moment.
  • Previous by thread: Re: Back with weird problems: PK generation keeps generating same PK... up to a moment.
  • Next by thread: Re: Back with weird problems: PK generation keeps generating same PK... up to a moment.
  • Index(es):
    • Date
    • Thread