I have to admit, it is a very long post full of different views. :-) From what I
gather, to avoid that situation, you
can use the high low pattern to prevent the same bean from ever having the same key.
-----Original Message-----
From: Jerson Chua [mailto:[EMAIL PROTECTED]]
Sent: Friday, September 08, 2000 9:39 AM
To: [EMAIL PROTECTED]
Subject: Re: Generating ID???
I've read it. But I'm particularly interested if this strategy works.
Jerson
--- "Bono, Chris" <[EMAIL PROTECTED]> wrote:
> Jerson,
> There is a long thread on this in the patterns section of serverside.com
>
> -----Original Message-----
> From: Jerson Chua [mailto:[EMAIL PROTECTED]]
> Sent: Friday, September 08, 2000 2:39 AM
> To: [EMAIL PROTECTED]
> Subject: Generating ID???
>
>
> Hello Guys...
>
> I've read an IBM article and it has an example in generating id/primary key. I have a
> doubt that 1 or more bean can get the same id. I want to verify this doubt. Is this
> scenario possible?
>
> 1. Customerbean1 retrieves max id
> 2. Customerbean2 retrieves max id
> 3. Customerbean1 increments maxid and store to db
> 4. Customerbean2 increments maxid and store to db
>
> public class CustomerEntityBean {
> public void ejbCreate(String name, int type) {
> key = getNextKey();
> ...
> }
>
> protected long getNextKey() {
> long nextKey = 0;
>
> Customer newestCustomer = ((CustomerHome)
> entityContext.getEJBHome()).findNewest();
> // the implementation of findNewest is not shown,
> // i guess the findNewest returns the bean with the highest
>id/primary
> key
> // in my point of view this is like select max(id) from customer + 1
> nextKey = ((CustomerKey)newestCustomer.getPrimaryKey()).key + 1;
> return nextKey;
> }
> }
>
> What's your opinion? Will this design work?
>
> Jerson
>
>
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