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

Answer 1

May be you should try this, adding @ForeignKey annotation :

@ManyToOne
@ForeignKey(name="FK_some_model")
@JoinColumn(name="some_model_id")
private SomeModel someModel

Answer 2

You can do it also by implementing ImplicitNamingStrategy.determineForeignKeyName and using

configuration.setImplicitNamingStrategy(
    new MyImplicitNamingStrategy())

which is nice as you don't have to do it manually again and again. However, it may be hard to put the relevant information there. I tried to concat everything I got (using three underscore to separate the parts) and ended up with

FK_ACCESS_TEMPLATE____TEMPLATE____TEMPLATE_ID____TEMPLATE_ID__INDEX_B

which isn't really better than

FKG2JM5OO91HT64EWUACF7TJCFN_INDEX_B

I guess, using just the referenced table and column names together with a number for uniqueness would be just fine.

---

Note also that this seems to be legacy Hibernate stuff, unsupported by JPA.

OTOH it works with Hibernate 5.0.1 (just one week old).

Answer 3

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;
}

Answer 4

Also you can use @ForeignKey embedded in @JoinColumn like this:

@JoinColumn(name = "BAR_ID", foreignKey = @ForeignKey(name = FK_BAR_OF_FOO))

for @ManyToMany relations you can use foreignKey and inverseForeignKey embedded in @JoinTable like this:

@JoinTable(name = "ARC_EMPLOYEE_OF_BAR"
        , joinColumns = {@JoinColumn(name = "BAR_ID")}
        , inverseJoinColumns = {@JoinColumn(name = "EMPLOYEE_ID")}
        , uniqueConstraints = {@UniqueConstraint(name = "ARC_UK_EMPLOYEE_OF_BAR", columnNames = {"EMPLOYEE_ID", "BAR_ID"})}
        , foreignKey = @ForeignKey(name = "ARC_FK_BAR_OF_EMPLOYEE")
        , inverseForeignKey = @ForeignKey(name = "ARC_FK_EMPLOYEE_OF_BAR"))