將具有條件的列連接到JPA實體

Question

我有兩個表：

person:
- person_id
- name

meeting:
- meeting_id
- person_id
- date

一個人可以舉行許多會議。 我的個人JPA實體如下所示：

@Entity
@Table(name = "person")
@Getter
public class Person {

  @Id
  private Integer personId;

  private String name;

  @Formula("(SELECT m.date FROM meeting m WHERE ROWNUM <= 1 AND m.person_id = person_id ORDER BY m.date DESC)")
  private Date lastMeetingDate;

問題是： 如何將上次會議日期包含在“ Person對象中。 上面的代碼生成ORA-00936錯誤（我正在使用Oracle數據庫）。

由findPersonById() SQL：

select person0_.person_id as person_id1_10, person0_.name as name2_10, (SELECT m.date FROM meeting m WHERE ROWNUM <= 1 AND m.person_id = person0_.person_id ORDER BY m.date DESC) as formula0_ form person person0_ where person0_.person_id=?

Answer 1

你應該試試：

SELECT max(m.date) FROM meeting m WHERE m.person_id = person_id