[英]Spring Data JpaRepository saveAndFlush not working in @Transactional test method
Using JPA Spring Data I have created a couple of entities Ebook and Review, which are linked by a ManyToOne relationship from Review towards Ebook.使用 JPA Spring 数据我创建了几个实体 Ebook 和 Review,它们通过从 Review 到 Ebook 的 ManyToOne 关系链接。 I have tried to insert a review for an existent ebook, but the result is not being reflected in the database (Postgres DB), even though I am using a saveAndFlush inside a @Transactional.
我试图为现有的电子书插入评论,但结果没有反映在数据库(Postgres DB)中,即使我在@Transactional 中使用了 saveAndFlush。 I retrieve inserted review correctly, it is just that is not saving the record in the table.
我正确检索插入的评论,只是没有将记录保存在表中。
Entities:实体:
Ebook:电子书:
@Entity
public class Ebook {
@Id
@SequenceGenerator(
name="ebook_sequence",
sequenceName = "ebook_sequence",
allocationSize = 1
)
@GeneratedValue (
strategy = GenerationType.SEQUENCE,
generator ="ebook_sequence"
)
private Long idEbook;
private String title;
}
Review:审查:
@Entity
public class Review {
@Id
@SequenceGenerator(
name="sequence_review",
sequenceName = "sequence_review",
allocationSize = 1
)
@GeneratedValue(
strategy = GenerationType.SEQUENCE,
generator = "sequence_review"
)
private Long idReview;
private String reviewText;
//ManytoOne Ebook
@ManyToOne(
cascade = CascadeType.ALL,
fetch = FetchType.LAZY
)
@JoinColumn(
name = "id_ebook",
referencedColumnName = "idEbook"
)
private Ebook ebook;
}
And the test in which I am trying to insert just a review corresponding to a preexisting ebook record:而我试图插入与预先存在的电子书记录相对应的评论的测试:
@Test
@Transactional
public void saveReviewWithEbook() {
Ebook ebook = ebookRepository.getById((long)1);
Review review = Review.builder()
.reviewText("review text ebook 1")
.ebook(ebook)
.build();
Review reviewInserted = reviewRepository.saveAndFlush(review); //saveAndFlush(review);
Review reviewLoaded = reviewRepository.getById(reviewInserted.getIdReview());
System.out.println("reviewLoaded = " + reviewLoaded);
}
After executing it, there is no record inserted in table 'review', although data appear correctly in variable 'reviewLoaded'.执行后,表“review”中没有插入记录,尽管数据在变量“reviewLoaded”中正确显示。 Why is that?
这是为什么? How can I save just a review corresponding to an existing ebook?
如何仅保存与现有电子书相对应的评论?
The transaction which is opened for the test is rolled back at the end of the test method.为测试打开的事务在测试方法结束时回滚。
This can be disabled:这可以禁用:
@Rollback(false) // <-- !
@Test
public void myTest()
Spring boot test @Transactional not saving Spring 开机测试@Transactional 不保存
Also note that the ORM (eg Hibernate) will probably have some caching in place, which can prevent actually hitting the DB when querying within a transaction for a known entity.另请注意,ORM(例如 Hibernate)可能会有一些缓存,这可以防止在事务中查询已知实体时实际命中数据库。
So to test the successful persistence of entities it is good practice to test the retrieval in a separated transaction.因此,要测试实体的成功持久性,最好在单独的事务中测试检索。
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