Question

我正在尝试使用ICriteria为此查询添加过滤器。通过应用程序的其余部分，我们使用了linq到nHibernate，这些过滤器工作正常，但是当我们使用I条件时，它们就会破坏。

日期过滤器以这种方式工作正常，但在尝试为操作系统名称设置过滤器时会引发错误。

 var query =
            this.session.QueryOver<AppEvent>();

        if (StartDate.HasValue) query = query.Where(a => a.Time >= StartDate);
        if (EndDate.HasValue) query = query.Where(a => a.Time <= EndDate);
        if (!string.IsNullOrEmpty(OSVersion)) query = query.Where(a => a.App.Version == OSVersion);
        if (!string.IsNullOrEmpty(OSName)) query = query.Where(a=> a.App.OperatingSystemName == OSName);
        if (!string.IsNullOrEmpty(Model)) query = query.Where(a => a.Client.ClientInfos.Any(x => x.DeviceModel == Model));


        var executedSql = query.Where(a => a.Name == eventName)
            .Left.JoinQueryOver<AppEventParameter>(t => t.Parameters)
            .Where(r => r.ParameterKey.IsIn(parameters))
            .TransformUsing(Transformers.DistinctRootEntity)
            .List();

        var results = executedSql.Select(a => new DTO
                                              {
                                                  param1 = a.Parameters.FirstOrDefault(x => x.ParameterKey == "param1") == null ? "" : a.Parameters.First(x => x.ParameterKey == "param1").ParameterValue,
                                                  param2 = a.Parameters.FirstOrDefault(x => x.ParameterKey == "param2") == null ? "" : a.Parameters.First(x => x.ParameterKey == "param2").ParameterValue

                                              }).Distinct(new DTOUniqueComparer());

引发的错误是：

NHibernate.QueryException : could not resolve property: App.OperatingSystemName of: Domain.Entities.AppEvent

感谢您提前的帮助

编辑：我设法使用JoinAlias方法解决它。在这里查看：

 if (StartDate.HasValue) query = query.Where(a => a.Time >= StartDate);
        if (EndDate.HasValue) query = query.Where(a => a.Time <= EndDate);
        if (!string.IsNullOrEmpty(OSVersion)) query = query.Where(a => a.App.Version == OSVersion);
        if (!string.IsNullOrEmpty(OSName)) query = query.JoinAlias(()=>appEventAlias.App,()=>appAlias).Where(()=>appAlias.OperatingSystemName==OSName);
        if (!string.IsNullOrEmpty(Model)) query = query.JoinAlias(()=>appEventAlias.Client, ()=>clientAlias).Where(()=>clientAlias.Id==appEventAlias.Client.Id).JoinAlias(()=>clientAlias.ClientInfos, () => clientInfoAlias).Where(()=>clientInfoAlias.DeviceModel == Model);

Answer 1

我设法解决了这个问题。最终需要使用JoinAlias方法。以下是我解决过滤器的方法：

 if (StartDate.HasValue) query = query.Where(a => a.Time >= StartDate);
        if (EndDate.HasValue) query = query.Where(a => a.Time <= EndDate);
        if (!string.IsNullOrEmpty(OSVersion)) query = query.Where(a => a.App.Version == OSVersion);
        if (!string.IsNullOrEmpty(OSName)) query = query.JoinAlias(()=>appEventAlias.App,()=>appAlias).Where(()=>appAlias.OperatingSystemName==OSName);
        if (!string.IsNullOrEmpty(Model)) query = query.JoinAlias(()=>appEventAlias.Client, ()=>clientAlias).Where(()=>clientAlias.Id==appEventAlias.Client.Id).JoinAlias(()=>clientAlias.ClientInfos, () => clientInfoAlias).Where(()=>clientInfoAlias.DeviceModel == Model);

将过滤器添加到nHibernate ICriteria

1 个答案: