Get Max row（Linq，NHibernate）

Question

遇到问题，我希望上次导入的数据显示失败。我结束诉诸HQL，因为我不得不执行两个查询任何人都可以看到为什么这不起作用（正确）在Linq到NHibernate，它是3.1中的已知错误？

我会写的SQL。

select JobImport.* from 
JobImportResult 
inner join (
    select Max(JobImportResultId) as JobImportResultId 
    from JobImportResult 
    group by JobImportId 
)as tbl on tbl.JobImportResultId = JobImportResult.JobImportResultId 
inner join JobImport on JobImport.JobImportId = JobImportResult.JobImportId 
where ImportFailureReasonId is not null 

HQL我结束了写作。

select jir.JobImport from JobImportResult jir where jir.Id in 
(select max(mjir.Id) from JobImportResult mjir group by mjir.JobImport) 
and jir.ImportFailureReason is not null 

LINQ的的作品（但我认为2000年后行将打破）

var innerQuery = Query<JobImportResult>() 
    .GroupBy(jir=>jir.JobImport) 
    .Select(jir=>jir.Max(jr=>jr.Id)); 

var innerQueryListed = innerQuery.ToList(); 

var resultQuery = Query<JobImportResult>() 
    .Where(jir => innerQueryListed.Contains(jir.Id) && jir.ImportFailureReason != null) 
    .Select(jir => jir.JobImport); 

LINQ的不工作:(

var innerQuery = Query<JobImportResult>() 
.GroupBy(jir=>jir.JobImport) 
.Select(jir=>jir.Max(jr=>jr.Id)); 

var resultQuery = Query<JobImportResult>() 
.Where(jir => innerQuery.Contains(jir.Id) && jir.ImportFailureReason != null) 
.Select(jir => jir.JobImport); 

Answer 1

您使用的.NET 4 ？如果是这样，请试试这个：

var innerQuery = Query<JobImportResult>() 
    .GroupBy(jir=>jir.JobImport) 
    .Select(jir=>jir.Max(jr=>jr.Id)) 
    .ToList(); 

var resultQuery = Query<JobImportResult>() 
    .Where(jir => innerQuery.Any(j => j == jir.Id) 
     && jir.ImportFailureReason != null) 
    .Select(jir => jir.JobImport) 
    .ToList(); //only use this if you want to resolve the query 

或.NET 3.5 ch ange resultQuery部分为：

var resultQuery = Query<JobImportResult>() 
    .Where(jir => innerQuery.Count(j => j == jir.Id) > 0 
     && jir.ImportFailureReason != null) 
    .Select(jir => jir.JobImport) 
    .ToList(); //only use this if you want to resolve the query