Hibernate-一对一唯一外键关联双向.doc

此文档收集于网络，如有侵权，请联系网站删除IdCard.javaprivate int id;private String cardNo;private Person person; Person.javaprivate int id;private String name;private IdCard idCard; public class One2OneTest extends TestCase public void testSave1() Session session = null;try session = HibernateUtils.getSession();session.beginTransaction();IdCard idCard = new IdCard();idCard.setCardNo(1111111111111);Person person = new Person();person.setName(女女);person.setIdCard(idCard);/不能成功保存，因为IdCard是Transient状态session.save(person);session.getTransaction().commit();catch(Exception e) e.printStackTrace();session.getTransaction().rollback();finally HibernateUtils.closeSession(session);public void testSave2() Session session = null;try session = HibernateUtils.getSession();session.beginTransaction();IdCard idCard = new IdCard();idCard.setCardNo(1111111111111);session.save(idCard);Person person = new Person();person.setName(女女);person.setIdCard(idCard);session.save(person);session.getTransaction().commit();catch(Exception e) e.printStackTrace();session.getTransaction().rollback();finally HibernateUtils.closeSession(session);public void testLoad1() Session session = null;try session = HibernateUtils.getSession();session.beginTransaction();Person person = (Person)session.load(Person.class, 2);System.out.println(= + person.getName();System.out.println(idCard.cardNo= + person.getIdCard().getCardNo();session.getTransaction().commit();catch(Exception e) e.printStackTrace();session.getTransaction().rollback();finally HibernateUtils.closeSession(session);public void testLoad2() Session session = null;try session = HibernateUtils.getSession();session.beginTransaction();IdCard idCard = (IdCard)session.load(IdCard.class, 1);System.out.println(idcard.cardNo= + idCard.getCardNo();System.out.println(= + idCard.getPerson().getName();session.getTransaction().commit();catch(Exception e) e.printStackTrace();session.getTransaction().rollback();finally HibernateUtils.closeSession(session);hibernate一对一唯一外键关联映射（双向关联PersonIdCard）一对一唯一外键关联双向，需要在另一端（idcard），添加标签，指示hibernate怎样加载这个关联对象，是默认根据主键加载person，外键关联映射中，因为两个实体采用的是person的外键维护的关系，所以不能指定主键加载person，而要根据person的外键加载，所以采用如下映射方式：