配置文件对象有一个任务列表。 保存新配置文件时,任务列表也应与数据库同步(插入 或更新)。问题是 profile-repository 的 save()-method 只允许一个或另一个方法取决于属性上方的级联属性集(CascadeType.PERSIST 或 MERGE) .
配置文件类
@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
public abstract class AbstractProfile implements Profile {
...
@OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.PERSIST)
private List<Task> tasks;
..
JUnit-测试类
public class ProfileTaskRepositoryTest {
@Autowired
private ProfileRepository profileRepo; //extends JpaRepository
@Autowired
private TaskRepository taskRepo; //extends JpaRepository
@Test // ->this test passes
public void testCreateProfileWithNewTask() {
//profileData and taskData hold dummy data. They return new objects
AbstractProfile interview = profileData.createITInterviewProfile();
Task questionTask = taskData.createInterviewQuestionTask();
//add new task to profile and save
interview.addTask(questionTask);
profileRepo.save(interview);
//task repository confirms the insertion
assertTrue(taskRepo.count() == 1);
}
@Test // ->this test fails
public void testCreateProfileWithExistingTask() {
//first create task and save in DB
Task questionTask = taskData.createInterviewQuestionTask(); // transient obj
taskRepo.save(questionTask); // questionTask becomes detached
// then create a new profile and add the existing task.
// the problem is the existing task is now detached)
AbstractProfile interview = profileData.createITInterviewProfile();
interview.addTask(questionTask);
profileRepo.save(interview); // !!! this throws an exception
}
我假设 questionTask-object 在 taskRepo 将它保存在 DB 中然后关闭 session 时分离。
异常(exception):
org.springframework.orm.jpa.JpaSystemException: org.hibernate.PersistentObjectException: detached entity passed to persist: *.Task; nested exception is javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: detached entity passed to persist: *.Task
...
profileRepo.save() 应该能够处理任务列表的插入 和更新。有什么优雅的方法可以解决这个问题吗?
最佳答案
您应该在测试类上放置@Transactional
属性以避免异常。
@Transactional
@TransactionConfiguration
public class ProfileTaskRepositoryTest {
}
希望这对您有所帮助。
关于java - Spring 数据存储库 : Detached entity passed to persist,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27531800/