HQL JOIN問題

Question

我有2類：教室，學生

Class Student { 
private Integer id; 
private ClassRoom classRoom; 
private String name; 

/* GETTERS AND SETTER */ 
} 


Class ClassRoom{ 
private Integer id; 
private Set<Student> students; 

/* GETTERS AND SETTER */ 
} 

什麼是HQL選擇具有studens所有教室叫約翰？

Answer 1

選項1：

select distinct ClassRoom 
from Student 
where Name = 'John' 

選項2：

from ClassRoom c 
where c in (select ClassRoom 
      from Student 
      where Name = 'John') 

Answer 2

嘗試

from ClassRoom inner join Student as student where student.name = 'John' 

您將需要使用完全合格（包括名稱空間）名稱類。

而且，如果該名稱來自客戶端的，你應該使用一個參數（例如：姓名）