【发布时间】：2020-05-29 12:31:38
【问题描述】：
我正在使用带有 restful api 的 spring boot 和 jpa。当我试图获取事件列表时，会发生这种类型的错误 - org.hibernate.QueryException：非法尝试使用元素属性引用 [type_id] 取消引用集合 [events0_.id.typesOfEvents]
我将 List 对象作为 args 传递给构造函数到 jpa 自定义查询中，但该查询不会执行它会引发错误。
事件是该实体中的主要实体，我使用 ManyToMany 关系获取了 typeOfEvents 列表，并且将两个 Id 表存储到第三个表中。
1.Event.java
@Builder
@ToString
@Entity
@Table(name = "events")
public @Data
class Events implements Comparable<Events> {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column
private Long id;
@ManyToOne(cascade = CascadeType.REFRESH)
@JoinColumn(name = "site_id")
private Sites sites;
@Column
private boolean multipleDays;
@ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
@JoinTable(name = "events_types",
joinColumns = @JoinColumn(name = "e_id"),
inverseJoinColumns = @JoinColumn(name = "t_id", unique = false))
private List<TypesOfEvents> typesOfEvents = new ArrayList<TypesOfEvents>(Arrays.asList());
@ManyToMany(cascade = CascadeType.DETACH)
@JoinTable(name = "events_format",
joinColumns = @JoinColumn(name = "e_id"),
inverseJoinColumns = @JoinColumn(name = "fs_id", unique = false))
private List<FormatStructure> formatStructure = new ArrayList<>();
@Column
private String startDate;
@Column
private String startTime;
@Column
private String endDate;
@Column
private String endTime;
@Column
private String eventName;
@Column
private String subTitle;
@Column
private String description;
@Column
private String location;
@ManyToOne(cascade = CascadeType.REFRESH)
@JoinColumn(name = "city_id")
private City city;
@ManyToOne(cascade = CascadeType.REFRESH)
@JoinColumn(name = "venue_one_off_option_id")
private VenueOneOffOptions venueOneOffOptions;
@Column
private double fee;
@Column
private boolean paid;
@Column
private String eventImg;
@ManyToOne(cascade = CascadeType.REFRESH)
@JoinColumn(name = "event_passport_option_id")
private EventPassportOptions eventPassportOptions;
@Column
private int passportTickets;
@Column
private int remainingTickets;
@Column
private boolean passport;
@Column
private int passportDiscountPercent;
@Column
private String promoCode;
@Column
private String siteUrl;
@Column
private String ticketPurchaseSite;
@Column
private String videoUrl;
@ManyToOne(cascade = CascadeType.REFRESH)
@JoinColumn(name = "primary_contact_member_id")
private Members primary_contact_member_id;
@ManyToOne(cascade = CascadeType.REFRESH)
@JoinColumn(name = "created_member_id")
private Members created_member_id;
@ManyToOne(cascade = CascadeType.REFRESH)
@JoinColumn(name = "group_id")
private Groups groups;
@Column
private String expectedAttendance;
@Column
private boolean myFavourite;
@ManyToOne(cascade = CascadeType.REFRESH)
@JoinColumn(name = "eventStatusId")
private EventStatus eventStatus;
@Column
private boolean purchasedPromotionalEmails;
@Column
private boolean featured;
@ManyToMany(cascade = CascadeType.DETACH)
@JoinTable(name = "events_audience_types",
joinColumns = @JoinColumn(name = "e_id"),
inverseJoinColumns = @JoinColumn(name = "at_id", unique = false))
private List<AudienceTypes> audienceTypes = new ArrayList<>();
@ManyToMany(cascade = CascadeType.DETACH)
@JoinTable(name = "events_food_options",
joinColumns = @JoinColumn(name = "e_id"),
inverseJoinColumns = @JoinColumn(name = "fo_id", unique = false))
private List<FoodOptions> foodOptions = new ArrayList<>();
public Events() {
}
@Override
public int compareTo(Events o) {
return (int) (this.id - o.id);
}
}
2.EventDTO.java
@ToString
@AllArgsConstructor
@NoArgsConstructor
@JsonIgnoreProperties(ignoreUnknown = true)
@JsonInclude(JsonInclude.Include.CUSTOM)
public @Data
class TestDTO implements Comparable<TestDTO>{
private Long id;
private boolean multipleDays;
private List<TypesOfEvents> eventType = new ArrayList<>(Arrays.asList());
private String startDate;
private String startTime;
private String endDate;
private String endTime;
private String eventName;
private String subTitle;
private String location;
private String city;
private double fee;
private boolean paid;
private String eventImg;
private Long passportOption;
private int passportTickets;
private int remainingTickets;
private boolean passport;
private String promoCode;
private String expectedAttendance;
private boolean myFavourite;
private String eventStatus;
private boolean featured;
public TestDTO(Long id, boolean multipleDays, List<TypesOfEvents> eventType, String startDate, String startTime, String endDate, String endTime, String eventName, String subTitle, String location, String city, double fee, boolean paid, String eventImg, Long passportOption, int passportTickets, int remainingTickets, boolean passport, String promoCode, String expectedAttendance, boolean myFavourite, String eventStatus, boolean featured) {
this.id = id;
this.multipleDays = multipleDays;
this.eventType = eventType;
this.startDate = startDate;
this.startTime = startTime;
this.endDate = endDate;
this.endTime = endTime;
this.eventName = eventName;
this.subTitle = subTitle;
this.location = location;
this.city = city;
this.fee = fee;
this.paid = paid;
this.eventImg = eventImg;
this.passportOption = passportOption;
this.passportTickets = passportTickets;
this.remainingTickets = remainingTickets;
this.passport = passport;
this.promoCode = promoCode;
this.expectedAttendance = expectedAttendance;
this.myFavourite = myFavourite;
this.eventStatus = eventStatus;
this.featured = featured;
}
}
3.查询
@Query("SELECT new com.test.responseDTO.TestDTO(e.id, e.multipleDays, e.typesOfEvents, e.startDate, e.startTime, e.endDate, e.endTime, e.eventName, e.subTitle, e.location, c.name, e.fee, e.paid, e.eventImg, p.event_passport_option_id, e.passportTickets, e.remainingTickets, e.passport, e.promoCode, e.expectedAttendance, e.myFavourite, s.status, e.featured)" +
" from Events e LEFT JOIN e.typesOfEvents.type_id t JOIN e.city c JOIN e.eventPassportOptions p JOIN e.eventStatus s WHERE e.startDate BETWEEN :startDate AND :endDate AND e.endDate BETWEEN :startDate AND :endDate ORDER BY e.startDate, e.id ASC")
List<TestDTO> findAllListOfEventsWithoutEventTypeIdWithOnlyTwoDateTest1(String startDate, String endDate);
4.错误
org.hibernate.QueryException: illegal attempt to dereference collection [events0_.id.typesOfEvents] with element property reference [type_id]
【问题讨论】：
-
你不能在构造函数表达式的构造函数中使用集合。
-
@Simon Martinelli 那么如何解决这个问题请帮助我。因为我想要带有对象列表的自定义字段
-
为什么需要 typesOfEvents？
-
在前端显示某些字段所必需的
标签： java spring-boot jpa