如何使用spring/hibernate在单个事务中保存一个父实体和多个子实体

Hibernate 有 OneToMany 用于保存和选择父类的批注。让我们创建如下关系:

@Entity
public class Employee{

  @Id
  private int id;

  private String fullName;

  private double salary;

  @OneToMany(cascade = CascadeType.ALL)
  @JoinColumn(name = "employee_id")
  private List<Contact> contacts;
}

@Entity
public class Contact{

   @Id
   private int id;

   private String phoneNumber;

   private String address;

}

保存方法:

public void save(){
  Employee employee = new Employee();
  employee.setFullName("John Smith");
  employee.setSalaru(5000);

  Contact contact1 = new Contact("+19874561232","Wall Street 10"); 
  Contact contact2 = new Contact("+11234561232","Green Street 10");
  List<Contact> contacts = new ArrayList();
  contacts.add(contact1);
  contacts.add(contact2);
  employee.setContacts(contacts);

  session.save(employee);
}

You can learn more about OneToMany.