JPA没有将外键保存到@OneToMany关系
I'm using Spring with Hibernate as a JPA provider and are trying to get a @OneToMany (a contact having many phonenumbers) to save the foreign key in the phone numbers table. From my form i get a Contact object that have a list of Phone(numbers) in it. The Contact get persisted properly (Hibernate fetches an PK from the specified sequence). The list of Phone(numbers) also gets persisted with a correct PK, but there's no FK to the Contacts table.
我正在使用Spring with Hibernate作为JPA提供程序,并且正在尝试获取@OneToMany(具有许多phonenumbers的联系人)以将外键保存在电话号码表中。从我的表单中我得到一个Contact对象,其中包含Phone(数字)列表。 Contact得到了正确的持久化(Hibernate从指定的序列中获取PK)。电话号码(号码)也会以正确的PK保留,但联系人表格中没有FK。
public class Contact implements Serializable {
@OneToMany(mappedBy = "contactId", cascade = CascadeType.ALL, fetch=FetchType.EAGER)
private List<Phone> phoneList;
}
public class Phone implements Serializable {
@JoinColumn(name = "contact_id", referencedColumnName = "contact_id")
@ManyToOne
private Contact contactId;
}
@Repository("contactDao")
@Transactional(readOnly = true)
public class ContactDaoImpl implements ContactDao {
@Transactional(readOnly = false, propagation = Propagation.REQUIRES_NEW)
public void save(Contact c) {
em.persist(c);
em.flush();
}
}
@Controller
public class ContactController {
@RequestMapping(value = "/contact/new", method = RequestMethod.POST)
public ModelAndView newContact(Contact c) {
ModelAndView mv = new ModelAndView("contactForm");
contactDao.save(c);
mv.addObject("contact", c);
return mv;
}
}
Hopefully I got all of the relevant bits above, otherwise please let me know.
希望我得到上面的所有相关内容,否则请告诉我。
4 个解决方案
#1
You have to manage the Java relationships yourself. For this kind of thing you need something like:
您必须自己管理Java关系。对于这种事情你需要这样的东西:
@Entity
public class Contact {
@Id
private Long id;
@OneToMany(cascade = CascadeType.PERSIST, mappedBy = "contact")
private List<Phone> phoneNumbers;
public void addPhone(PhoneNumber phone) {
if (phone != null) {
if (phoneNumbers == null) {
phoneNumbers = new ArrayList<Phone>();
}
phoneNumbers.add(phone);
phone.setContact(this);
}
}
...
}
@Entity
public class PhoneNumber {
@Id
private Long id;
@ManyToOne
private Contact contact;
...
}
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