Question

@Query(value = "SELECT r FROM Reservation r WHERE r.reservationSeance.id=:seanceId " +
            "AND r.seanceDate=:seanceDate " +
            "order by r.id DESC LIMIT 1", nativeQuery = true)
public Reservation findReservationBySeanceDateAndSeanceId(@Param("seanceId") int seanceId, @Param("seanceDate") java.time.LocalDate seanceDate);

没有nativeQuery作为参数，我有错误'，'或预期为空，得到LIMIT stackoverflow，但是当使用它并设置为true时我有错误

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'r' in 'field list'

编辑：查询中使用的实体

@Entity
@Table(name="reservation")
@Data
@NoArgsConstructor
public class Reservation {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(nullable = false, unique = true)
    private Integer id;

    private java.time.LocalDate reservationDate;
    private java.time.LocalDate seanceDate;

    private Integer reservationNr;

    @ManyToOne(fetch = FetchType.LAZY)
    private Seance reservationSeance;

    @ManyToOne(fetch = FetchType.LAZY, cascade = CascadeType.MERGE)
    @JoinColumn(name = "user_id")
    private User userReservation;

    @OneToMany(orphanRemoval = true, cascade = CascadeType.MERGE)
    private List<Seat> seats = new ArrayList<>();
}

Seance实体

@Entity
@Table(name="seance")
@Data
public class Seance {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(nullable = false, unique = true)
    private Integer id;

    private java.time.LocalTime displayTime;

    @ManyToOne
    private Film film;

    @Column(length=127)
    private String kind;

    @ManyToOne(fetch = FetchType.LAZY, cascade = CascadeType.MERGE)
    private Hall hall;

    @OneToMany(mappedBy = "reservationSeance")
    @JsonIgnore
    private List<Reservation> reservations = new ArrayList<>();
}

前几天我在@JoinColumn购买，有时会删除此注释

Answer 1

@Query(value = "SELECT * FROM Reservation r WHERE **r.reservationSeanceId**=:seanceId " +
            "AND r.seanceDate=:seanceDate " +
            "order by r.id DESC LIMIT 1", nativeQuery = true)
public Reservation findReservationBySeanceDateAndSeanceId(@Param("seanceId") int seanceId, @Param("seanceDate") java.time.LocalDate seanceDate);

我认为这应该与上面类似。问题正在发生，因为您尝试使用别名 r ，然后使用字段名 reservationSeance ，然后使用字段名 id 。这是不正确的。

请提供您的表格以获取有关您的问题的更多信息。我可以假设 r.reservationSeance.id 是fk，在这种情况下，您应该使用完整的fk名称，该名称在您的@JoinColumn name批注中指向。

已更新。

请查看Reservation或Seance类，其中将包含关系注释。例如，您使用@OneToMany的地方应该是@JoinColumn name = 'your_fk_name' 然后，请粘贴此fk_name进行查询，而不是r.reservationSeance.id。

字段列表中的NativeQuery未知列

1 个答案: