Question

我在基于Spring Boot的项目中使用Hibernate 5.3.10作为我的ORM。假设我们具有以下实体：

@Entity
@Table(name = "parent")
@Inheritance(strategy = InheritanceType.JOINED)
public class Parent {
    @EmbeddedId
    private EmbId id;

    public Id getId() { return id; }
    public void setId(Id id) { this.id = id; }
}

@Entity
@Table(name = "child")
@PrimaryKeyJoinColumns({
    @PrimaryKeyJoinColumn(name = "id"),
    @PrimaryKeyJoinColumn(name = "date_time")
})
public class Child {
    @EmbeddedId
    private EmbId id;

    private String name;

    public Id getId() { return this.id; }
    public void setId(Id id) { this.id = id; }

    public String getName() { return this.name; }
    public void setName(String name) { this.name = name; }
}

和可嵌入密钥如下：

@Embeddable
public class EmbId {
    @Column(name = "id")
    private Long id;

    @Column(name = "date_time")
    private Date dateTime;

    public Long getId() { return this.id; }
    public void setId(Long id) { this.id = id; }

    public Date getDateTime() { return this.dateTime; }
    public void setDateTime(Date dateTime) { this.dateTime = dateTime; }
}

当我想对Child实体进行多态查询时，JPA面临ORA-00932 Inconsistent datatypes: expected TIMESTAMP got NUMBER，并且在控制台中看到以下sql：

select child0_.id as date_time1_25_0, child0_.date_time as id2_25_0, child0_1_.name as name3_3_0 from my_schema.child child0_ inner join my_schema.parent child0_1_ on child0_.id = child0_1_.date_time and child0_.date_time = child0_1_.id

ID的相等性似乎已被取代。发生了什么事，我应该怎么解决？

谢谢。

Answer 1

幸运的是，我发现将referencedColumnName属性添加到@PrimaryKeyJoinColumn可以引导休眠模式在正确的位置使用ID。

因此，Child类应如下所示：

@Entity
@Table(name = "child")
@PrimaryKeyJoinColumns({
    @PrimaryKeyJoinColumn(name = "id"),
    @PrimaryKeyJoinColumn(name = "date_time")
})
public class Child {
    @EmbeddedId
    private EmbId id;

    private String name;

    public Id getId() { return this.id; }
    public void setId(Id id) { this.id = id; }

    public String getName() { return this.name; }
    public void setName(String name) { this.name = name; }
}

数据类型不一致：预期的TIMESTAMP得到了NUMBER

1 个答案: