Question

我有两个实体Person和BlacklistInfo，它们之间具有OneToOne的关系。

Person.java

@Data
@Entity
@Immutable
@Table(name = "person_tbl")
public class Person {
    @Column(name = "person_id")
    @Id
    private Long personId;
    
    // ... other members

    @OneToOne
    @JoinColumn(name = "person_id", referencedColumnName = "person_id")
    private BlacklistInfo blacklistInfo;
}

AdditionalInfo.java

@Data
@Entity
@Immutable
@Table(name = "blacklist_info_tbl")
public class BlacklistInfo {

    @Id
    @Column(name = "person_id")
    private Long personId;
   
    // ... other members
}

BlacklistInfo的

Person可以为空。目前我想找到未列入黑名单的人。

我可以通过以下操作之一来进行操作：

查询所有人员并从其中删除黑名单

执行左联接查询并检查personId中的BlacklistInfo是否为空

select p from Person p left join p.blacklistInfo where p.blacklistInfo.personId is null

问题是：Can I do the 2nd operation without explicitly mentioning left join the in query section? Can it be done by modifying entity relationship ?

我将hibernate-5.4.12.Final与spring-boot-2.2.x一起使用

Answer 1

您还要如何查询此信息？使用JPQL / HQL做到这一点完全没问题。

始终保持与Hibernate的OneToOne映射连接

1 个答案: