Question

我花了两天时间试图解决这个问题。我有测试实体：

    @Id
@Column(name = "id")
@GeneratedValue(strategy = GenerationType.AUTO)
private long id;
@Column(name = "is_multichoice", nullable = false)
private boolean isMultichoice;
@Column(name = "is_open", nullable = false)
private boolean isOpen;
@Column(name = "picture")
private String picture;
@Column(name = "question")
private String question;
@ManyToOne
@JoinColumn(name = "test_id", nullable = false)
private Test test;
@Column(name = "archived", nullable = false)
private boolean isArchived;
@OneToMany(mappedBy = "question", fetch = FetchType.EAGER)
private Set<Answer> answers;

此测试实体有问题集，这样问题实体有答案集。< / p>

问题实体：

    @Id
@Column(name = "id")
@GeneratedValue(strategy = GenerationType.AUTO)
private long id;
@Column(name = "answer_text", nullable = false)
private String answerText;
@Column(name = "mark", nullable = false)
private int mark;
@ManyToOne
@JoinColumn(name = "question_id")
private Question question;
@Column(name = "picture")
private String picture;
@Column(name = "archived", nullable = false)
private boolean isArchived;

回答实体：

@NamedQuery(name = "getCurrentTestById",
        query = "SELECT test From Result result JOIN result.test test JOIN result.user user " +
                "JOIN test.questions question JOIN question.answers answer " +
                "WHERE test.id = :testId AND user.id = :userId " +
                "AND result.permission.id = :permissionId AND question.isArchived = false AND answer.isArchived = false")

然后，我的目标是从数据库中获取测试。我用条件写了HQL查询：问题和答案不应该存档。这是：

               query = "SELECT t.id, t.test_name, t.duration, q.id as qId, " +
                    "q.question as question, q.is_multichoice as is_multichoice, " +
                    "q.is_open as is_open, a.id as aId, a.answer_text as answer_text  FROM result r " +
                    "JOIN test t ON r.test_id = t.id " +
                    "JOIN user u ON r.user_id = u.id " +
                    "JOIN question q ON t.id = q.test_id JOIN answer a ON q.id = a.question_id " +
                    "WHERE t.id = :testId AND u.id = :userId AND r.permission = :permissionId " +
                    "AND q.archived = false AND a.archived = false", resultClass = com.bionic.entities.Test.class)

然而，这个查询仍然归还了我甚至存档的问题/答案。然后，我尝试编写本机SQL查询：

{{1}}

宾果！我在MYSQL工作台中测试了这个并且有效，我只获得了归档记录。但是，当我将它用于我的实体存档的问题和答案仍然出现！

我需要解决这个问题，而不是创建包装器和方法（在Java中）来从所有人那里获取未归档的记录。所以，我希望从查询中获得我需要的东西。

Answer 1

如果您的具体测试可以存档但不存档 - 您的HQL不正确。 Hibernate找到一个包含一个或多个未归档问题的测试，然后加载测试获取所有问题（存档或未存档）。因此，您需要查询问题列表。像这样的东西

from Question question inner join question.test test WHERE test.id = :testId AND question.archived = false

SQL查询：与实体不正确的工作

1 个答案: