Layered Architecture - Repository and reflection

Question

I am currently using Layered Architecture in my (small) project and thought about extending my BaseRepository (the one the class-specific repositories inherit from) using reflection for the insert/update/delete methods.

My BaseRepository.java looks like this:

public  abstract class BaseRepository<CLASS extends BaseDomain<CLASS>>{

}

Where BaseDomain is just:

public class BaseDomain<CLASS extends BaseDomain<CLASS>> {
    private Long id;

    //getters setts etc.
}

Now my problem is in the deleteById method in the BaseRepository:

 public  int deleteById(Connection connection, Long id) throws SQLException {
    PreparedStatement delete= connection.prepareStatement("DELETE FROM ? WHERE id = ?");
    delete.setObject(1, entity) //heres the problem, where do I get entity from?
    delete.setObject(2, id);

    return 0;
}

My specific repository extends the Base one like this:

public class UserRepository extends BaseRepository<User>{

}

How do I get the User class in the BaseRepository so I can use it in the delete/update etc. methods?

Thanks for any help!

Answer 1

How about making the entity be a param to the BaseRepository constructor.

EDIT:

public class UserRepository extends BaseRepository<User>{

    public static final String ENTITY = "users";        

    public UserRepository(){
        super(ENTITY);
    }    

}

Answer 2

A simple way I can think but I haven't tried is to pass the entity class type to the BaseRepository .

private final Class<CLASS> entityType;
public BaseRepository(Class<CLASS> entityType) {
  this.entityType = entityType;
// do your stuff
}

To find the right table to operate according to the entity class type. Could be by convention like most of Ruby ORMs do, say, if the entity type is User , then you can operate against users or user or whatever the convention is.

Or could have a object to provide the configuration to BaseRepository