java jpa查询没有id表的方法

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

CREATE TABLE `classinfo` (
  `class_id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'id',
  `class_name` varchar(200) NOT NULL DEFAULT '' COMMENT 'name',
  PRIMARY KEY (`class_id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long classId;

CREATE TABLE `simpletable` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

import javax.persistence.*;
import java.io.Serializable;
import java.util.Objects;
/**
 * A Simpletable.
 */
@Entity
@Table(name = "simpletable")
public class Simpletable implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    // jhipster-needle-entity-add-field - JHipster will add fields here, do not remove
    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        Simpletable simpletable = (Simpletable) o;
        if (simpletable.getId() == null || getId() == null) {
            return false;
        }
        return Objects.equals(getId(), simpletable.getId());
    }
    @Override
    public int hashCode() {
        return Objects.hashCode(getId());
    }
    @Override
    public String toString() {
        return "Simpletable{" +
            "id=" + getId() +
            "}";
    }
}

import xxx.Simpletable;
import org.springframework.data.jpa.repository.*;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;
import java.util.List;
import java.util.Map;
/**
 * Spring Data  repository for the Classinfo entity.
 */
@SuppressWarnings("unused")
@Repository
public interface ClassinfoRepository extends CrudRepository<Simpletable, Long> {
    @Query(value = "select * " +
            " from classinfo  " +
            "where class_id = ?1 " +
            "order by  class_id DESC ", nativeQuery = true)
    List<Map<String,Object>> findByClassId(String id);
}