Fluent NHibernate - Map 2 tables to one class

Question

I have a table structure something like this

table Employees
 EmployeeID
 EmployeeLogin
 EmployeeCustID

table Customers
 CustomerID
 CustomerName
         


        

Answer 1

Is EmployeeCustID unique? If not, this is never going to work, as you then try to cram two different entity types into 1. Also, with your structure, how do you want to save an instance? -> the CustomerID isn't known, so you can't save such an entity.

IMHO it's better to simply keep Customer as a related entity to Employee, as (I assume) the EmployeeCustID is used to link a Customer entity to an Employee entity if the employee is also a customer, which means 'customer' is just a role for employee and therefore optional and changeable and thus should be a separate entity.