Question

我正在使用Spring Boot（2.1.4）并尝试编写一个简单的单元测试以删除一个实体。实体（为简洁起见，省略了某些部分）：

@Entity
@Table(name = "my_table")
public class MyEntity {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    protected Long id;

    @Getter
    @Type(type="uuid-char")
    @Column(name = "attribute_id", unique = true, nullable = false)
    protected UUID attributeId;

    @Version
    protected Date version;

    @Getter
    @Column(unique = true, nullable = false)
    protected String value;

}

该实体有一个简单的存储库：

public interface MyEntityRepository extends PagingAndSortingRepository<MyEntity, Long> {

    Optional<MyEntity> findByMyId(UUID id);

}

单元测试使用内存数据库：

spring:
  jpa:
    database: H2
    database-platform: org.hibernate.dialect.H2Dialect
    hibernate:
      ddl-auto: create
    properties:
      hibernate.cache.use_second_level_cache: false
      hibernate.cache.use_query_cache: false
    generate-ddl: true
  datasource:
    url: jdbc:h2:mem:test;DB_CLOSE_DELAY=-1;DATABASE_TO_UPPER=false
    username: sa
    password: sa
    driver-class-name: org.h2.Driver

测试本身（使用database-rider）：

@Test
@DataSet(value = INITIAL, transactional = true)
void delete() {
    Optional<MyEntity> v = repository.findByMyId(SECOND.getAttributeId());
    assertThat(v.isPresent()).isTrue();
    repository.delete(v.get());
    v = repository.findByMyId(SECOND.getAttributeId());
}

测试的最后一行抛出以下异常：

Caused by: org.hibernate.StaleStateException: Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1
    at org.hibernate.jdbc.Expectations$BasicExpectation.checkBatched(Expectations.java:67)
    at org.hibernate.jdbc.Expectations$BasicExpectation.verifyOutcome(Expectations.java:54)
    at org.hibernate.engine.jdbc.batch.internal.NonBatchingBatch.addToBatch(NonBatchingBatch.java:46)
    at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:3480)
    at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:3737)
    at org.hibernate.action.internal.EntityDeleteAction.execute(EntityDeleteAction.java:99)
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:604)
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:478)

所有其他用于保存和查找的测试均按预期运行，仅使用删除造成了这个。

我从其他帖子中尝试了几种建议的解决方案（this是类似的帖子，但是它不能解决我的问题）

Answer 1

您是否尝试过使用@ExpectedDataSet？通过这种方式，您可以让dbrider在测试执行后断言数据库的状态：

@Test
@DataSet(value = INITIAL, transactional = true)
@ExpectedDataSet("expected.yml")
void delete() {
    Optional<MyEntity> v = repository.findByMyId(SECOND.getAttributeId());
    assertThat(v.isPresent()).isTrue();
    repository.delete(v.get());
    //v = repository.findByMyId(SECOND.getAttributeId()); let dbrider assert that for you
}

Answer 2

您正在执行尚未提交的删除操作，然后尝试访问v = repository.findByMyId(SECOND.getAttributeId());。

Spring Boot在单元测试中删除实体会导致StaleStateException：批处理更新从更新返回意外行数

2 个答案: