jpa native query control entity(part 2)

Question

Cont. on jpa native query retrieve multiple entities

• My database (testing)
  

  company - ID {PK}, name
  staff - ID{PK}, name, companyID{FK}
  department - ID{PK}, name, companyID{FK}, staffID{FK}
  project - ID{PK}, name, staffID{FK}
  

• First, I want to backup the company table.

  String query = "SELECT c.ID as companyid, c.name as companyname FROM company c";
  Query q = em.createNativeQuery(query, "MAPPING");
  List<CompanyDTO> list = q.getResultList();
  
  Company.java
  @SqlResultSetMapping(name = "MAPPING", classes = {
  @ConstructorResult(
      targetClass = CompanyDTO.class,
      columns = {
          @ColumnResult(name = "companyid"),
          @ColumnResult(name = "companyname")
      })
  })
  ...
  

• Second, I want to backup the staff table.

  String query = "SELECT s.ID as staffid, s.name as staffname, s.companyID as companyID 
                  FROM staff s JOIN company c ON c.ID = s.companyID";
  Query q = em.createNativeQuery(query, "MAPPING");
  List<CompanyDTO> list = q.getResultList();
  
  Company.java
  @SqlResultSetMapping(name = "MAPPING", classes = {
  @ConstructorResult(
      targetClass = CompanyDTO.class,
      columns = {
          @ColumnResult(name = "staffid"),
          @ColumnResult(name = "staffname"),
          @ColumnResult(name = "companyID")
      })
  })
  ...
  

• Now I don't want to fix my table and class. How do I control the ? from the following?

  SELECT ... FROM ? 
  List<?> list = q.getResultList();
  

  Any help please...