JPA OneToOne映射

package junit.test;import javax.persistence.EntityManager;import javax.persistence.EntityManagerFactory;import javax.persistence.Persistence;import org.junit.Test;import com.jvwl.model.IDCard;import com.jvwl.model.Person;public class JPATest {@Test public void test(){EntityManagerFactory factory = Persistence.createEntityManagerFactory("jvwl");EntityManager em = factory.createEntityManager();em.getTransaction().begin();Person person = new Person("李菏");person.setIdCard(new IDCard("12212121"));em.persist(person);em.getTransaction().commit();em.close();factory.close();}}

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