Jim Moseby writes:
However, altho I know that by making the random number big enough
the likelyhood of collisions can be made vanishingly small, I was
actually concerned with eliminating the possibility of collisions
altogether by checking to see if the number had been used before.
I just don't know how to do that properly with Mysql. Perhaps it
is necessary to lock to table, check, make the insert and then
unlock it. But I was hoping that there would be a simpler way.
One way is to make your id field a unique key. MySQL will not let
you insert a record with a duplicate unique key, and will issue an
error. Your code should always check for errors on insert anyway,
so if you get an error, generate a new key and try again.
Thanks. Yes, I check for errors. But there are other types of errors
so I'd need to verify that it is a duplicate key error and, in my
ignorance, I have not yet figured out how to do that programatically.
I worry about getting into an infinite loop.
Best,
Craig
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