java - Changing the generated name of a foreign key in Hibernate

Question

@OneToOne()
@JoinColumn(name="vehicle_id", referencedColumnName="vehicleId")
public Vehicle getVehicle() {
    return vehicle;
}

My UserDetails class has a one-to-one mapping with the Entitity class Vehicle. Hibernate creates the 2 tables and assigns a generic Foreign Key, which maps the vehicle_id column (UserDetails table.) to the primary key vehicleId (Vehicle table).

KEY FKB7C889CEAF42C7A1 (vehicle_id),
CONSTRAINT FKB7C889CEAF42C7A1 FOREIGN KEY (vehicle_id) REFERENCES vehicle (vehicleId)

My question is : how do we change this generated foreign key, into something meaningful, like Fk_userdetails_vehicle for example.

Answer 1

Since JPA 2.1, you can use the @javax.persistence.ForeignKey annotation:

@OneToOne()
@JoinColumn(name="vehicle_id", referencedColumnName="vehicleId", foreignKey=@ForeignKey(name = "Fk_userdetails_vehicle"))
public Vehicle getVehicle() {
    return vehicle;
}

Prior to JPA 2.1, you could use Hibernate’s @org.hibernate.annotations.ForeignKey annotation, but this is now deprecated:

@OneToOne()
@JoinColumn(name="vehicle_id", referencedColumnName="vehicleId")
@ForeignKey(name="Fk_userdetails_vehicle")
public Vehicle getVehicle() {
   return vehicle;
}