Hibernate query a foreign key field with ID

Question

For example, I have two entities: Employee and Address. Of these enitities, Employee has a foreign key AddressID references the ID column on Address. In the Java domain obje

Answer 1

Hibernate "nicely wraps" only what you tell it to wrap. So, assuming that your Employee mapping looks something like:

@Entity
public class Employee {
  ...
  @ManyToOne
  @JoinColumn(name="address_id")
  private Address address;
  ...
}

and your Address has an id property, you can query based on address_id via:

session.createCriteria(Employee.class)
 .add(Restrictions.eq("address.id", addressId));

In order to query based on Address properties, you'll have to create aliases or nested criteria:

session.createCriteria(Employee.class)
 .createAlias("address", "a")
 .add(Restrictions.eq("a.postalCode", postalCode));

Answer 2

Having similar trouble... @ChssPly76 answer works fine, but just found solution if foreign key is not part of Id in parent table - you must modify annotation by adding "referencedColumnName":

@ManyToOne
@JoinColumn(name="address_id", referencedColumnName="addrUniqueFieldName")
private Address address;

and then you can create criteria:

criteria.add(restriction.eq("address.addrUniqueFieldName", 123);