如何使用SpringBoot从cassandra中检索空集

// 1. 配置Cassandra连接
@Configuration
public class CassandraConfig extends AbstractCassandraConfiguration {
    @Override
    protected String getKeyspaceName() {
        return "mykeyspace";
    }

    @Override
    protected String getContactPoints() {
        return "localhost";
    }

    @Override
    protected int getPort() {
        return 9042;
    }

    @Override
    protected String getLocalDataCenter() {
        return "datacenter1";
    }
}

// 2. 创建Cassandra数据模型
@Table
public class MyEntity {
    @PrimaryKey
    private UUID id;

    private String name;

    // getters and setters
}

// 3. 创建Cassandra存储库接口
@Repository
public interface MyEntityRepository extends CassandraRepository<MyEntity, UUID> {
    // 4. 编写查询方法
    @Query("SELECT * FROM mytable WHERE name = ''")
    List<MyEntity> findEmptySet();
}

// 5. 调用查询方法
@Service
public class MyService {
    @Autowired
    private MyEntityRepository repository;

    public List<MyEntity> getEmptySet() {
        return repository.findEmptySet();
    }
}