[erlang-questions] Mnesia create a table with a auto increase id?

[fei wang]

I am now using mnesia database, and I have a user table with record
#users{
          uid,
          username,
          password
          }

Problem one is if a username is already in the table, it would not be
inserted into the table. Should I first query the table to see if there is a
same name in it?  Any other good methods?

Problem tow is the uid should be auto increased each insert time, I have no
idea about this... Should I change the type of table to ordered-set, and
query the last record's uid value, increase it by myself?

If anyone have some good idea, or something about mnesia which I don't know,
please tell me, thanks.


Oizys
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---------------
       致
礼！


王飞
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