HQL JOIN问题

Question

我有2个课程： ClassRoom ，学生

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 */
}

HQL 是什么选择所有名为 John 的学生的ClassRooms？

Answer 1

尝试

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

您需要为您的班级使用完全限定（带名称空间）名称。

此外，如果名称来自客户端，则应使用参数（例如：名称）

Answer 2

选项1：

select distinct ClassRoom
from Student
where Name = 'John'

选项2：

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