Get Max row（Linq，NHibernate）

Question

遇到問題，我希望上次導入的數據顯示失敗。我結束訴諸HQL，因爲我不得不執行兩個查詢任何人都可以看到爲什麼這不起作用（正確）在Linq到NHibernate，它是3.1中的已知錯誤？

我會寫的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我結束了寫作。

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（但我認爲2000年後行將打破）

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 ？如果是這樣，請試試這個：

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部分爲：

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