Hi,
I have two foreign keys which I don't know how to map. Can anybody help me?

1) FOREIGN KEY (postalcode) REFERENCES city_postalcode (id) ON DELETE CASCADE

@ManyToOne(cascade=CascadeType.REMOVE,optional=false,fetch=FetchType.LAZY)
@Cascade({org.hibernate.annotations.CascadeType.REMOVE,
org.hibernate.annotations.CascadeType.DELETE_ORPHAN})
@JoinColumn(name="country", nullable=false, updatable=true)
public Country getCountry() {
return country;
}


2) FOREIGN KEY (createdby) REFERENCES uservm(id) ON DELETE SET NULL
@ManyToOne(optional=true,fetch=FetchType.LAZY)
@JoinColumn(name="createdby", nullable=true, updatable=true)
public UserVM getCreatedBy() {
return createdBy;
}

Also, what is the difference between REMOVE and DELETE_ORPHAN options?

Thanks in advance