Creating unique identifier inside a class

1. The database has a method for generating a unique identifier for a particular person. Creating an identifier uses the merged name and surname converted into lowercase letters. If it's already an identifier is created then a continuation is added to it - the number where the number changes in the number from 1, 2,. . . until an identifier is assigned to an namesurname number that was not previously generated.

How do I implement this method?

2. The database can store data using a vector or string. Distinguish using the bridge. How can this be achieved?