How to generate unique number of 12 digits?

Question

I\'m working on an app that sends raw data to zebra printer and print out barcodes. And since every item has its own unique barcode, I need to define a variable that automat

Answer 1

Start with a twelve digit number, ie: 111111111111

to get your new 'random' unique number take the previous number and add 1.

although not random, it will guarantee uniqueness.