休眠更新表

Question

我是 Hibernate 的新手，按照 http://www.vaannila.com/hibernate/hibernate-example/hibernate-mapping-one-to-many-using-annotations-1.html 上的教程，我对该教程中的主类有疑问。

我明白了

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

将新记录插入三个表中。但是如果这个学生得到另一个号码

电话工作 = new Phone("mobile","12345678");

如何更新 PHONE 和 STUDENT_PHONE 表。谢谢。

Answer 1

你错过了几件事。此代码将起作用：

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();