@JoinFormula和@OneToMany定义-较差的文档

Question

我有两个有关@JoinFormula和@OneToMany批注的问题：

1. 如何限制带有@JoinFormula和@OneToMany注释的结果数？

2. 如何定义id表达式中author = id所指的Author.id？

   Author {
   
   @Id
   private Long id;
   
   @OneToMany
   @JoinFormula(value = "SELECT a FROM Article a WHERE author = id AND schedule < CURRENT_TIMESTAMP()") // limit = 15
   private List<Article> pastArticles;
   

   }

像这样，即使删除schedule <子句的一部分，我也会保持pastArticles为空。

谢谢！

Answer 1

答案1：

@Size(max=10)
private List<Comment> commentList;

答案2 ：（仅是这样的例子）

public class A{

    @Id
    @GeneratedValue
    private Integer id;

    private String uuid;

    ...
  }

其他班级

public class B{
      @Id 
      @GeneratedValue
      private Integer id;

      private String uuidOfA;



  @ManyToOne
  @JoinColumnsOrFormulas({
  @JoinColumnOrFormula(formula=@JoinFormula(value="(SELECT a.id FROM A a WHERE a.uuid = uuid)", referencedColumnName="id")),
  @JoinColumnOrFormula(column = @JoinColumn("uuidOfA", referencedColumnName="uuid"))
})

     private A a;      
}