java - 在 Hibernate 4 中获取错误意外 token

Question

您好，我正在使用 spring mvc 3 和 hibernate 4 开发一个 Web 应用程序。我对所有配置都使用注释。

当我尝试选择一个实体时，出现错误:

DaoException: unexpected token: MEMBER near line 1, column 37 [from clanwar.model.ClanMember where MEMBER = :member]
at clanwar.dao.impl.ClanMemberDao.findByPlayerId(ClanMemberDao.java:71)

如果我使用 .createSQLQuery() 进行查询，hibernate 会返回一个 ClanMember 实体的 Object[] 实例。

DAO 中的方法:

    @Repository
    @Transactional

    ...

    @Override
    public ClanMember findByPlayerId(int id) throws DaoException {

        ClanMember foundMember;

        try {
            foundMember = (ClanMember) getSession()
                .createQuery("from ClanMember where MEMBER = :member")
                .setParameter("member", id)
                .uniqueResult();
        } catch (Exception e) {
            throw new DaoException(e.getMessage());
        }

        return foundMember;
    }

    ...

实体:

@Entity
@Table(name = "CLAN_MEMBERS")
public class ClanMember implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @ManyToOne
    @JoinColumn(name = "CLAN")
    private Clan clan;

    @Id
    @ManyToOne
    @JoinColumn(name = "MEMBER")
    private Player member;

    @ManyToOne
    @JoinColumn(name = "ROLE")
    private ClanRole role;

    public ClanMember() {}

    // Setters and getters

}

表 CLAN_MEMBERS:

+--------+---------+------+-----+---------+-------+
| Field  | Type    | Null | Key | Default | Extra |
+--------+---------+------+-----+---------+-------+
| CLAN   | int(11) | NO   | PRI | NULL    |       |
| MEMBER | int(11) | NO   | PRI | NULL    |       |
| ROLE   | int(11) | NO   |     | 1       |       |
+--------+---------+------+-----+---------+-------+

我做错了什么？ 提前致谢。

Answer 1

member 是 HQL 中的保留字。通过添加表别名来转义它。

此外，由于 member 的类型为 Player，因此当您的 where 子句 包含 member 时，您需要提供Player 类型的参数。或者，如果您想像现在一样提供 ID，则需要显式搜索 id:

所以要么:

 foundMember = (ClanMember) getSession()
            .createQuery("from ClanMember c where c.member = :member")
            .setParameter("member", someInstanceOfPlayer);
            .uniqueResult();

或

 foundMember = (ClanMember) getSession()
            .createQuery("from ClanMember c where c.member = :member")
            .setParameter("member", idOfAPlayer);
            .uniqueResult();