在Spring Data Mongodb中使用Query类进行不区分大小写的排序

编程问答 2022-08-23

问题描述

我正在使用这种排序方式，并且我希望不区分大小写。

dockerfile

我尝试了此查询，但没有得到任何结果。

使用的进口：

            Query query = new Query();
            query.with(new Sort(new Order(Sort.Direction.ASC,"title").ignoreCase()));
            return db.find(query,Video.class);

例如，如果我有这种标题： “ Inception”，“ BlackList”，“ adore”，“ 123”，“ city”，“ desperadoS”

顺序应为： “ 123”，“ adore”，“ BlackList”，“ city”，“ desperadoS”，“ Inception”

如果我这样使用

import org.springframework.data.domain.sort;
import org.springframework.data.domain.sort.Direction;
import org.springframework.data.domain.sort.Order;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;

返回

“ 123”，“ BlackList”，“ Inception”，“ adore”，“ city”，“ desperadoS”

Spring-data-mongodb版本1.9.2

解决方法

使用排序规则对忽略的案例进行排序。 例子是here

使用时，您将收到IllegalArgumentException new Order(Sort.Direction.ASC,"title").ignoreCase())

在您的情况下：

Query query = new Query().with(Sort.by(new Sort.Order(Sort.Direction.ASC,"title")));
query.collation(Collation.of("en").strength(Collation.ComparisonLevel.secondary()));
return mongoTemplate.find(query,Video.class);
,

另一种将 Collation 与 @Query 注释结合使用以获得 "123","adore","BlackList","city","desperadoS","Inception" 的预期排序顺序的方法

文档

@Document(collection = "video")
@Data
public class Video {

    @Id
    private String id;
    private String title;

    public Video(String title) {
        this.title = title;
    }
}

存储库

@Repository
public interface VideoRepository extends MongoRepository<Video,String> {

    @Query(collation = "en",value = "{}")
    List<Video> getAllSortedVideos(Sort sort);

}

用于断言更改的集成测试类

@ActiveProfiles("test")
@SpringBootTest(classes = DemoApplication.class,webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
class VideoRepositoryITest {

    @Autowired
    private VideoRepository videoRepository;

    @Test
    void getAllSortedVideos() {
        List<String> expectedSystemNamesInOrder = Arrays.asList("123","Inception");
        //breaking the order for fun
        Set<String> expectedSystemNamesSet = new HashSet<>(expectedSystemNamesInOrder);
        //saving the videos of each title
        expectedSystemNamesSet.stream().map(Video::new)
                .forEach(videoRepository::save);
        //fetching sorted Videos by title
        List<Video> videos = videoRepository.getAllSortedVideos(Sort.by(Direction.ASC,"title"));
        //fetching sorted Video tiles to assert
        List<String> titles = videos.stream().map(Video::getTitle).collect(Collectors.toList());
        //asserting the result video title order with the expected order
        for (int i = 0; i < titles.size(); i++) {
            String actualTitle = titles.get(i);
            String expectedTitle = expectedSystemNamesInOrder.get(i);
            //Test case will fail if the retrieved title order doesn't match with expected order
            Assertions.assertEquals(expectedTitle,actualTitle);
        }
    }

}

使用 org.springframework.data:spring-data-mongodb:3.0.4.RELEASE

javajavamongodbspring-data-mongodb