Question

我有3个实体类：

@Table(name = "offer")
@DiscriminatorColumn(name="type")
@Inheritance(strategy = InheritanceType.JOINED)
public abstract class Offer extends Audited {
    ...

    @OneToMany(mappedBy="offer", fetch = FetchType.EAGER)
    private Set<CompanyOffer> deals;

}

@Entity
@DiscriminatorValue("moving")
public class MovingOffer extends Offer {...}

@Table(name = "company_offer")
public class CompanyOffer extends Audited {
    ...

    @NotNull
    @ManyToOne
    @JoinColumn(
        name = "offer_id",
        foreignKey = @ForeignKey(name = "fk_companyoffer_offer")
    )
    private Offer offer;

}

表格的创建完全符合预期，但当我想获得MovingOffer时，则没有deals。 deals属性始终设置为null，但值正确存储在数据库中。

在hibernate的日志中，我可以找到以下行：

No collections were found in result set for role: com.company.entity.Offer.deals

可能出现问题的任何提示？

编辑：为了获取数据，我使用JpaRepository。使用方法findFullById

public interface MovingOfferRepository extends JpaRepository<MovingOffer, UUID> {

    @Query("SELECT mo FROM MovingOffer mo LEFT JOIN FETCH mo.deals WHERE mo.id = ?1")
    MovingOffer findFullById(UUID movingOfferId);

}

以下是直接来自postgres的所有3个表的定义：

                                        Table "public.offer"
  Column      |            Type             | Modifiers | Storage  | Stats target | Description
 type             | character varying(31)       | not null  | extended |              |
 id               | uuid                        | not null  | plain    |              |
 createdat        | timestamp without time zone | not null  | plain    |              |
 lastmodifiedat   | timestamp without time zone | not null  | plain    |              |
 deliverydate     | bytea                       |           | extended |              |
 externalorderid  | character varying(255)      |           | extended |              |
 status           | character varying(255)      | not null  | extended |              |
 customer_id      | uuid                        |           | plain    |              |
Indexes:
    "offer_pkey" PRIMARY KEY, btree (id)
Foreign-key constraints:
    "fk_offer_customer" FOREIGN KEY (customer_id) REFERENCES customer(id)
Referenced by:
    TABLE "company_offer" CONSTRAINT "fk_companyoffer_offer" FOREIGN KEY (offer_id) REFERENCES offer(id)
    TABLE "movingoffer" CONSTRAINT "fkg74slpkg2tob4b3ydqilcfdrn" FOREIGN KEY (id) REFERENCES offer(id)


                      Table "public.movingoffer"
  Column      |  Type   | Modifiers | Storage | Stats target | Description
------------------+---------+-----------+---------+--------------+-------------
 boxcount         | integer |           | plain   |              |
 id               | uuid    | not null  | plain   |              |
 startaddress_id  | uuid    | not null  | plain   |              |
 targetaddress_id | uuid    | not null  | plain   |              |
Indexes:
    "movingoffer_pkey" PRIMARY KEY, btree (id)
Foreign-key constraints:
    "fk_address_from" FOREIGN KEY (startaddress_id) REFERENCES address(id)
    "fk_address_to" FOREIGN KEY (targetaddress_id) REFERENCES address(id)
    "fkg74slpkg2tob4b3ydqilcfdrn" FOREIGN KEY (id) REFERENCES offer(id)



                                Table "public.company_offer"
  Column       |            Type             | Modifiers | Storage  | Stats target | Description 
-------------------+-----------------------------+-----------+----------+--------------+-------------


id                | uuid                        | not null  | plain    |              | 
 createdat         | timestamp without time zone | not null  | plain    |              | 
 lastmodifiedat    | timestamp without time zone | not null  | plain    |              | 
 estimatedduration | double precision            |           | plain    |              | 
 message           | text                        |           | extended |              | 
 totalprice        | numeric(19,2)               |           | main     |              | 
 company_id        | uuid                        | not null  | plain    |              | 
 offer_id          | uuid                        | not null  | plain    |              | 
Indexes:
    "company_offer_pkey" PRIMARY KEY, btree (id)
Foreign-key constraints:
    "fk_companyoffer_company" FOREIGN KEY (company_id) REFERENCES company(id)
    "fk_companyoffer_offer" FOREIGN KEY (offer_id) REFERENCES offer(id)

Jpa没有获得1到N的关系

0 个答案: