Question

当我的成员总数为Guild.League = 0时，我正在尝试更新TournamentXP：

    using (var session = sessionFactory.OpenStatelessSession())
    using (var tx = session.BeginTransaction())
    {
        const int maxLeagues = 6;
        session.CreateQuery(
            @"update Guild g set g.League = g.League + 1 where g.League < " + maxLeagues + @" 
                AND g.Id in (
                    select GuildId from (
                       select GuildId, SUM(u.TournamentXP) AS s from User u where GuildId != 0 group by u.GuildId) r
                    where r.s = 0)
        ").ExecuteUpdate();

        tx.Commit();
    }

查询在查询的第3行第48行附近抛出“Antlr.Runtime.NoViableAltException”。

原始的postgresql查询（运行正常）看起来像：

update guilds set league = league + 1 where league <= 5 
                AND id in (
                    select guild_id from (
                       select guild_id, SUM(u.tournament_xp) AS s from users u where guild_id != 0 group by u.guild_id) r
                    where r.s = 0)

如何让它在HQL中运行？

此外，如果您可以为查询提出任何优化，我将很高兴听到它。

Answer 1

这是因为HQL不支持FROM子句上的子查询。它仅支持select / where子句。

因此要么使用本机SQL（或）将内部子查询从子句转换为where子句。

BTW你可以直接使用HAVING子句并避免from子句中的内部子查询，如下所示：

AND g.Id in (
 select u.GuildId from User u where u.GuildId != 0
 group by u.GuildId
 having SUM(u.TournamentXP) = 0
)

具有复杂内部查询的HQL更新查询

1 个答案: