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我有三个实体主题,主题和类别。我如何预取每个实体的ID和名称列,同时检索包含主题和主题的所有类别?我不需要其他领域,因为它会影响性能。嵌套集合的投影
@Entity
class Topic{
private Long id;
private String name;
...
//other fields
}
@Entity
class Subject{
private Long id;
private String name;
...
//other fields
@OneToMany(fetch=FetchType.LAZY)
private List<Topic> topics;
}
@Entity
class Category{
private Long id;
private String name;
...
//other fields
@OneToMany(fetch=FetchType.LAZY)
private List<Subject> subjects;
}
谢谢,但有一个问题:我得组主题和主题之后手动 – romanvintonyak