Just getting id column value not using join in hibernate object one to many relation

Question

I\'m using hibernate 4+.

I have two sample tables.

Table A

public class A {
  @Id
  private int id;

  @OneToMany(fetch=LAZY)
  private List&         


        

Answer 1

Yes, because proxies contain the id anyway. To get the id of an A proxy without initializing it, first declare the id to be accessed via property:

@Entity
public class A {
  @Id
  @Access(AccessType.PROPERTY)
  private int id;

  @OneToMany(fetch=LAZY)
  private List list;

  public int getId() {
    return id;
  }

  public void setId(int id) {
    this.id = id;
  }
}

Then, just read the id:

b.getA().getId();

Changing access type for the id is necessary because if you use field access, Hibernate does not distinguish getId() method from other ordinary methods (which trigger proxy initialization when invoked).