Automatically generated user id [closed]

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I am making an iphone application in which there is use of database. I want that whenever user put his or her information, there should be unique id no for each user. But this id no should generate automatically.

How can I do this..please help me.

Thanks alot.

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You can get a unique ID by doing this:

NSString *uniqueID = [[NSProcessInfo processInfo] globallyUniqueString];
NSLog(@"%@", uniqueID);

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Since you will be using SQLite for your database specific, you could make use of the auto increment present in SQLite for generating id automatically.

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I prefer you to use uuid for each user. If you don't know about uuid check it may be this will fulfill your requirements.

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see if this answer How to save a video taken from camera into sqlite database in iphone helps.
You can certainly take the unique Id generation from that link.

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Have a look at the following example.

http://iosdevelopertips.com/general/create-a-universally-unique-identifier-uuid.html

this generated string + number unique string.

If you want only numbers then i guess you have to use current timestamp + some auto-generated random number string.