Re: Implicit row locking during an UPDATE

On Fri, May 25, 2001 at 02:23:50AM -0000, Dr. Evil wrote:
>
> I'm still not understanding this, and it's vitally important to the
> project I'm working on, so I have a question:
>
> >From my understanding, this:
>
> UPDATE account SET value = 10 WHERE number = 99;
>
> actually implies all of this:
>
> BEGIN;
> SELECT value FOR UPDATE FROM account WHERE number = 99;
> UPDATE account SET value = 10 WHERE number = 99;
> COMMIT;
> END;
>
> Is this correct?  If so, there's something I don't understand.

No.  Maybe you want to read the manual.  Specifically look at
transaction isolation level under MVCC.  Hmm, SET TRANSACTION ISOLATION
LEVEL doesn't seem to be taking in 7.1.1... Is that a bug?  Guess the
only way to be sure is to use the transaction semantics above...

--
Eric G. Miller <egm2@jps.net>