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被保留之前，CookBookRepository#findAll().

会找到它

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 );
        }
}

请注意失败的assertThat(cookbookRecipeRepository.findAll().size(), is(0));：

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

Answer 1

您的示例中没有未经加载的数据。触发查询（对于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，如果您有Recipe和Cookbook的存储库，那么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。

Spring Data Repository查找未加载的数据

1 个答案: