I looked on the IBObjects site and don't know where to find this,
I suppose the FAQ search page is the right place but it only works by
selecting categories etc, there are too many, I looked in the keyword search
and only found things for Locking rows,

I actually wanted to achieve this without locking records

Maybe you have a url to the article you suggest?

thanks


-----Original Message-----
From: Alan McDonald [mailto:alan@...]
Sent: Wednesday, February 25, 2004 14:30
To: firebird-support@yahoogroups.com
Subject: RE: [firebird-support] Generator Integrity

> I want to generate an ID this ID must be saved to a table let's say
> GENERATED_IDS table, I want to use this way to keep track of all my id's
> there may be no gaps
>
> Now the problem is that this needs to happen in 2 calls
>
> 1) Generate ID
> 2) Insert into Generated_IDS the generated ID has extra column
> (status), status (I - Inprogress, C = Complete)
>
>
> The problem is that if I can do that in one transaction I am
> guaranteed that
> if anything goes wrong all is rolled back
> But what if something goes wrong after step 1 ie. Db machine crashes, or
> client or middle-tier supposed to do step 2 crashes
>
> I know most people would take this as an admissible small chance that this
> may happen, but you know Murphy.
> So if Generators in Firebird runs outside of transactions, how could you
> achieve this integrity
> I guess you could write this to occur in a stored proc which further
> minimizes the chance of failure since it all happens
> On one thread on the db machine and is lot less likely to failure during
> this process, would this be the safest.
>
> But I would prefer not to use a stored proc, many reasons not wanting to
> explain right now.
>
> Is there a way to achieve this with a generator?
>
> Thanks.
>

I suppose you have read the paper on "an aditable series of values" ?
You'll find it on the IBObjects website
I don't agree with all it's logic but the method of using transaction
settings to lock fields while you increment them seems to be a popular way
to do what you want.
alan






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