在加入的集合元素上加入引用属性

Question

我有 users 和 users_updateable_data 表，它们具有一对一的关系 (User.UpdateableData)。此外，每个 User 都可以在 Guild 中（有一个映射 Guild.Users；User.GuildId 属性是 guilds 的外键）。

所以我有 Guild, Guild.Users, User, User.UpdateableData, User.GuildId.

我正在尝试从 users 获取满足某些条件的特定属性：

    public class UserTournamentInfo
    {
        public virtual int Id { get; set; } // from user
        public virtual int TournamentXP { get; set; } // from upd. data
        public virtual int League { get; set; } // from user
        public virtual int TournamentClassXP { get; set; } // from upd. data
        public virtual int? GuildId { get; set; } // from user
        public virtual int? GuildLeague { get; set; } // from guild
    }

所以我需要做两个连接：guild + users（右外）和user + upd。数据。

我是这样尝试的：

    public virtual IEnumerable<UserTournamentInfo> GetTournamentUserToXP()
    {
        using (ISession session = SessionFactory.OpenSession())
        using (session.BeginTransaction())
        {
            User userAlias = null;
            User.UpdateableDataContainer userUpdAlias = null;
            Guild guildAlias = null;
            UserTournamentInfo dto2 = null;

            var result = session.QueryOver<Guild>(() => guildAlias)
                .JoinAlias(x => x.Users, () => userAlias, JoinType.RightOuterJoin)
                // next line doesn't compile
                .JoinAlias((User u) => u.UpdateableData, () => userUpdAlias, JoinType.RightOuterJoin)
                .Select(MakeProjections())
                .Where(() => userAlias.TournamentXP > 0)
                .TransformUsing(Transformers.AliasToBean<UserTournamentInfo>())
                .List<UserTournamentInfo>();

            session.Transaction.Commit();
            return result;
        }
    }

以下是我定义投影的方式：

    public static IProjection[] MakeProjections()
    {
        Guild guildAlias = null;
        User userAlias = null;
        User.UpdateableDataContainer userUpdAlias = null;
        UserTournamentInfo dto = null;

        return new[]
                {
     Projections.Property(() => userAlias.Id).WithAlias(() => dto.Id),
     Projections.Property(() => userUpdAlias.TournamentClassXP).WithAlias(() => dto.TournamentClassXP),
     Projections.Property(() => userUpdAlias.TournamentXP).WithAlias(() => dto.TournamentXP),
     Projections.Property(() => userAlias.GuildId).WithAlias(() => dto.GuildId),
     Projections.Property(() => userAlias.League).WithAlias(() => dto.League),
     Projections.Property(() => guildAlias.League).WithAlias(() => dto.GuildLeague),
                      };
    }

在我决定将 users 拆分为两个表 - users 和 users_updateable_data 之前它起作用了。

如何进行这个连接查询？

Answer 1

我用HQL解决了：

SELECT 
u.Id as Id, ud.TournamentClassXP as TournamentClassXP, ud.TournamentXP as TournamentXP, u.GuildId as GuildId, u.League as League, g.League as GuildLeague
FROM Guild g RIGHT OUTER JOIN g.Users u JOIN u.UpdateableData ud
WHERE ud.TournamentXP > 0

在加入的集合元素上加入引用属性

Join referenced property on joined collection element

c#

nhibernate

hibernate

join

queryover

在加入的集合元素上加入引用 属性

Join referenced property on joined collection element

c#

nhibernate

hibernate

join

queryover

在加入的集合元素上加入引用属性