Java 如何按相关实体的计数进行订购

我有两个实体，文件和评论：

@Entity
@Table(name = "FILE")
@SuppressWarnings("serial")
@XmlRootElement
public class File implements Serializable {

    (...)
    private Set<Commentary> commentaries = new HashSet<Commentary>();

    (...)
    @OneToMany(mappedBy = "file")
    public Set<Commentary> getCommentaries() {
        return commentaries;
    }
}

@Entity
@Table(name = "COMMENTARY")
@SuppressWarnings("serial")
public class Commentary implements Serializable {

(...)
private File file;

(...)
@ManyToOne
@JoinColumn(name = "FILE_ID")
public File getFile() {
    return file;
}

没有运气。如何使用HQL正确执行此操作？

试试这个

 SELECT f FROM FILE f WHERE f.name LIKE '%example%' ORDER BY COUNT(commentaries)

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我找到了答案。正确的HQL查询是：

SELECT f FROM FILE f WHERE f.name LIKE '%example%' ORDER BY size(f.commentaries)

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你观察到了什么错误？

SELECT f FROM FILE f WHERE f.name LIKE '%example%' ORDER BY size(f.commentaries)