我将一个工作(postgre)sql查询翻译成jpql,但是hibernate抛出一个
org.hibernate.hql.ast.QuerySyntaxException: 意外的AST节点 例外
这些是我的核心模型类:
@Entity
public class Piece {
@Id
@GeneratedValue
public Long id;
@ManyToOne
public AUser user;
public long index;
...
}
@Entity
public class Vote {
@Id
@GeneratedValue
public Long id;
@ManyToOne
public AUser receiver;
...
}
@Entity
public class AUser {
@Id
@GeneratedValue
public Long id;
@OneToMany(mappedBy="receiver", cascade=CascadeType.ALL)
public List<Vote> receivedVotes;
...
}
这是我的jpql查询:
String query = "select p from Piece p order by (select count(v.receiver) from Vote v where v.receiver.id=p.user.id) desc, p.index";
任何人都可以解释异常,它为什么会发生以及如何更改查询以避免它。谢谢!
答案 0 :(得分:6)
JPQL不支持order by
中的子查询。如果我正确理解您的查询,您可以尝试这样的事情:
select p
from Piece p left join p.user.receivedVotes rv
group by p
order by count(rv) desc, p.index