休眠更新表

Question

我是Hibernate的新手，在教程http://www.vaannila.com/hibernate/hibernate-example/hibernate-mapping-one-to-many-using-annotations-1.html之後，我對該教程中的主類有個疑問。

我明白

 
Set phoneNumbers = new HashSet(); 
phoneNumbers.add(new Phone("house","32354353")); 
phoneNumbers.add(new Phone("mobile","9889343423")); 
Student student = new Student("Eswar", phoneNumbers); 
session.save(student); 
transaction.commit(); 

新記錄插入三個表。但是，如果這名學生得到另一個號碼

 
Phone work = new Phone("mobile","12345678"); 

我怎麼能更新PHONE和STUDENT_PHONE表。謝謝。

Answer 1

您錯過了幾件事情。此代碼將工作：

Set phoneNumbers = new HashSet(); 
student.setPhoneNumbers(phoneNumbers); // Add the phone numbers to the Student 

Phone phone = new Phone("house","32354353"); 
session.save(phone); // Persist the new object 
phoneNumbers.add(phone); 

Phone phone = new Phone("mobile","9889343423"); 
session.save(phone); // Persist the new object 
phoneNumbers.add(phone); 

Student student = new Student("Eswar", phoneNumbers); 
session.save(student); 
transaction.commit();