running number

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I am required to write a user registration script that captures the basics like name, phone number etc etc. I would also have to write to mySQL database a number that is associated with that user.

At this point of writing, the start of that number is unknown. But the number will be incremented by 1 after each successfull registration.

Let's say the number starts from 12345.

I am quite new at all these stuff and would like to seek your advise on the *recommended way* of achieving this. I am thinking along these lines:
a) store that number (12345) in a table
b) a user registers and assign that number to him
c) increment number to 12346
d) process repeats for the next registration

Concern: How do tell mySQL to lock the 'number' table when a new registration process is about to take place. Is locking the best option here or is/are there better ways?

Please advise.

--
Roger


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