Spring Data Repository查找未加载的数据

Question

我对Spring引导数据和使用hibernate的JPA有很奇怪的行为.在我的实体CookbookRecipe被持久化之前,它被发现了CookBookRepository#findAll().

public interface CookbookRecipeRepository extends ExtendedJpaRepository<CookbookRecipe, Long> {}

.

public class ExtendedJpaRepositoryImpl<T, ID extends Serializable> extends SimpleJpaRepository<T, ID> implements ExtendedJpaRepository<T, ID> {
    // added a new helper method, but certainly not overridden findAll
}

测试

@RunWith(SpringRunner.class)
@DataJpaTest
public class CookbookRepositoryIntegrationTest {

    @Autowired
    RecipeRepository recipeRepository;
    @Autowired
    CookbookRepository cookbookRepository;
    @Autowired
    CookbookRecipeRepository cookbookRecipeRepository;

    @Test
    public void WhenAddingSameAssociationAgain_ThenNoException() {
        Recipe recipe = new Recipe();
        recipe.setTitle("A Recipe");
        recipe = recipeRepository.save(recipe);

        Cookbook cookbook = new Cookbook();
        cookbook.setTitle("A Cookbook");
        cookbook = cookbookRepository.save(cookbook);

        cookbook.addRecipe(recipe, "integrationtest", new Date());
        assertThat(cookbookRecipeRepository.findAll().size(), is(0));
        cookbook = cookbookRepository.save(cookbook);
        ...
    }
}

食谱实体

public void addRecipe(Recipe recipe, String createdBy, Date createdDate) {
        final CookbookRecipe cookbookRecipe = new CookbookRecipe(this, recipe);
        cookbookRecipe.setCreatedBy(createdBy);
        cookbookRecipe.setCreatedDate(createdDate);
        if( !cookbookRecipes.contains(cookbookRecipe) && !recipe.getCookbookRecipes().contains(cookbookRecipe)) {
            cookbookRecipes.add(cookbookRecipe);
            recipe.getCookbookRecipes().add( cookbookRecipe );
        }
}

请注意assertThat(cookbookRecipeRepository.findAll().size(), is(0));哪个失败:

java.lang.AssertionError: 
Expected: is <0>
     but: was <1>

Answer 1

您的示例中没有未提供的数据.触发查询(for findAll())会导致JPA持久性提供程序刷新您对托管实例(cookbook.addReceipe(…))所做的所有挂起更改.

除此之外,如果你有两个存储库Recipe,Cookbook它也不太可能有一个CookbookRecipeRepository.确保考虑聚合边界的位置,并仅为聚合根创建存储库.