How to get usernames based on a particular role and save that in the entity?

Hi Team,

I am struck at a particular point in my project. In my project I have to display the usernames based on role in a dropdown, when a person log in with different user role. After selecting a user it should save in my request  table. How can I achieve this? What is the datatype I have to map to that attribute when mapping?

Thanks,

Regards

Sushuma