At 9:00 AM +1100 2/9/09, Chris wrote:
Person a signs up with em...@example.com
Before you are able to fetch the result (which is possible in a high
traffic site), person b also signs up with em...@example.com
Going back to person a, when you fetch, you get record #2 instead of #1.
They are not the same record.
Not a great example because you probably wouldn't have people using
the same address from different locations, but it's just to
demonstrate the problem of doing it this way.
That's not true, or at least I don't believe it.
If I have a script that has opened and established a communication
link with a dB and has just created a new record with an unique email
address and the code immediately (next few lines in the script)
follows that action with asking the dB to pull the record just
created with that email address, then I AM getting the same record
regardless -- there are no RACE conditions here.
Keep in mind that I AM using unique identifiers, such as a
logon/password or email address. If I create a record using that
unique identifier and then ask the dB to deliver it, then it is
without doubt the same record.
If I was not using an unique identifier, then I would agree with you.
But unique is unique -- it makes no difference if it's a record ID or
email address -- both are unique.
Cheers,
tedd
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