删除OneToMany关系的孩子不起作用

Question

我从OneToMany关系中删除数据库子项时遇到问题。

这是我的课程：

public class Question {

 private Set<Answer> answers
/.................

  @OneToMany(fetch = FetchType.EAGER, mappedBy = "question", orphanRemoval = true)
  public Set<Answer> getAnswers() {
    return this.answers;
  }

/.................
}

和答案类：

public class Answer {

private Question question
/............

  @ManyToOne(fetch = FetchType.EAGER)
  @JoinColumn(name = "QUESTION_ID", nullable = false)
  public Question getQuestion() {
    return this.question;
  }

/...........
}

我正在尝试删除问题及其所有答案，如下所示：

public void deleteQuestions(List<Question> questions){

    for(Question question : questions){
      Question databaseQuestion = questionRepository.findOne(question.getId());
      for(Answer answer : databaseQuestion.getAnswers()){
        answerRepository.delete(answer.getId());
      }
      questionRepository.delete(databaseQuestion);
    }
  }

我得到：

ORA-02292: integrity constraint (DATABASE_NAME.ANSWER_QUESTION_FK) violated - child record found

我不知道怎么了。 当我将CascadeType.ALL放在Question getAnswers()我仍然遇到相同的问题。 我正在使用Spring Data的Hibernate ORM。 另外，当我强制应用程序显示sql命令时，我可以看到Hibernate甚至没有试图删除Answers，只有一个删除-问题。

Answer 1

尝试级联，使用如下

@OneToMany (cascade = CascadeType.ALL, fetch = FetchType.EAGER, mappedBy = "question",orphanRemoval=true)

此链接您的答案JPA CascadeType.ALL不会删除孤儿