JPA - 使用 2 个外键编写连接查询

Question

我有 2 个实体：

@Entity
@Table(name = "HOUSE")
public class House {
  //other fields
  @ManyToOne
  @JoinColumn(name = "OWNER_1", referencedColumnName = "OWNER_ID")
  private Owner owner1;

  @ManyToOne
  @JoinColumn(name = "OWNER_2", referencedColumnName = "OWNER_ID")
  private Owner owner2;
}

@Entity
@Table(name = "OWNER")
public class Owner {
  @Id
  @Column(name = "OWNER_ID")
  private String id;
}

我有这样的 SQL 查询来加入 2 个表：

select a.*, b.* from HOUSE a INNER JOIN OWNER b on a.OWNER_1 = b.OWNER_ID or a.OWNER_2 = b.OWNER_ID

但我不知道如何在 JPA 查询中编写它。 任何人都可以帮忙吗？

Answer 1

JPA 查询将非常相似：

select a, b 
from House a, Owner b 
where a.owner1.id= b.id or a.owner2.id = b.id

请记住，查询的结果将是List<Object[2]> ，您必须自己解析。