Question

我有一个父实体类和两个子实体类。在父类上，有三个用@ManyToOne注释的属性，以及其他五个用@Column注释的属性。

Hibernate希望在子数据库表（将来和库存）中使用@ManyToOne注释的三个属性（国家，交易所，部门）。

当数据库表“ future”和“ stock”中不存在这三个FK属性时，将引发以下异常： org.hibernate.tool.schema.spi.SchemaManagementException：模式验证：缺少列表[future]

中的[country_id]

知道为什么吗？是否需要在子DB表中重复/添加外键列？

@MappedSuperclass
public abstract class BaseEntity implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @Column(name = "id")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    protected int id;
}

父母：文书

@Entity
@Inheritance(strategy = InheritanceType.JOINED)
@DiscriminatorColumn(name="instr_type", discriminatorType = DiscriminatorType.STRING, length = 1)
@Table(name = "instrument")

public class Instrument extends BaseEntity {              

    @Column
    private String symbol;

    @Column
    private String isin;

    @Column
    private String name;

    @Column
    @Enumerated(EnumType.STRING)
    private LiquidEnum liquid;

    @Column
    private boolean active;

    // FK

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "country_id", nullable = false, foreignKey = @ForeignKey(name = "instrument_country_fk"))
    private Country country;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "exchange_id", nullable = false, foreignKey = @ForeignKey(name = "instrument_exchange_fk"))
    private Exchange exchange;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "sector_id", nullable = true, foreignKey = @ForeignKey(name = "instrument_sector_fk"))
    private Sector sector;

    // FK end

    getter / setter
    ...
}

子类别：未来

@Entity
@Table(name = "future")
@DiscriminatorValue("F")
@PrimaryKeyJoinColumn(name = "id")
public class Future extends Instrument {

    @Column(name = "expirationdate")
    private LocalDate expirationDate;

    public LocalDate getExpirationDate() {
        return expirationDate;
    }

    public void setExpirationdate(LocalDate expirationDate) {
        this.expirationDate = expirationDate;
    }
}

子类别：股票

@Entity
@Table(name = "stock")
@DiscriminatorValue("S")
@PrimaryKeyJoinColumn(name = "id")
public class Stock extends Instrument  {

}

Answer 1

我找到了问题的原因：外键对象（国家，交易所，部门）引用的是股票实体，而不是工具实体。

当我使用继承策略重构数据库模型（向父级添加实体“ Instrument”）时，我忘记将Country，Exchange和Sector中的@OneToMany属性重定向到Instrument实体。

JPA Hibernate InheritanceType.JOINED SchemaManagementException

1 个答案: