package ejava.examples.orm.rel.composite;
   
   import javax.persistence.*;
   
   /**
    * This class provides an example use of a composite @IdClass primary key
    * where one of the properties of the IdClass is re-used as a foreign key.
    */
   @Entity @Table(name="ORMREL_ROOM")
  @IdClass(RoomPK.class)
  @AttributeOverrides({
  	@AttributeOverride(name = "houseId", column=@Column(name="HOUSE_ID")),
  	@AttributeOverride(name = "roomId", column=@Column(name="ROOM_ID"))
  })
  public class Room {
  	@Id 
  	private int houseId;
  	@Id
  	private int roomId;
  	
  	@ManyToOne(fetch=FetchType.LAZY, optional=false)
  	//assign join column to primary key value and turn off inserts/updates here
  	@JoinColumn(name="HOUSE_ID", insertable=false, updatable=false)
  	private House house;
  	
  	public Room() {}
  	public Room(House house, int roomId) {
  		this.houseId=house.getId();
  		this.house=house;
  		this.roomId=roomId;
  	}
  	
  	public House getHouse() { return house; }
  	public int getRoomId() { return roomId; }	
  }