Question

I am thoroughly frustrated right now. I am having an issue with LINQ-To-SQL. About 80% of the time, it works great and I love it. The other 20% of the time, the query that L2S creates returns the correct data, but when actually running it from code, it doesn’t return anything. I am about to pull my hair out. I am hoping somebody can see a problem or has heard of this before. Google searching isn’t returning much of anything.

Here is the linq query…

var query = from e in DataLayerGlobals.GetInstance().db.MILLERTIMECARDs
        where e.deleted_by == -1
        && e.LNAME == lastName
        && e.FNAME == firstName
        && e.TIMECARDDATE == startDate.ToString("MM/dd/yyyy")
        group e by e.LNAME into g
        select new EmployeeHours
        {
            ContractHours = g.Sum(e => e.HRSCONTRACT),
            MillerHours = g.Sum(e => e.HRSSHOWRAIN + e.HRSOTHER),
            TravelHours = g.Sum(e => e.HRSTRAVEL)
        };

This is the generated query….

 SELECT SUM([t0].[HRSCONTRACT]) AS [ContractHours], 
        SUM([t0].[HRSSHOWRAIN] + [t0].[HRSOTHER]) AS [MillerHours], 
        SUM([t0].[HRSTRAVEL]) AS [TravelHours]
 FROM [dbo].[MILLERTIMECARD] AS [t0]
 WHERE ([t0].[deleted_by] = @p0) 
    AND ([t0].[LNAME] = @p1) 
    AND ([t0].[FNAME] = @p2) 
    AND ([t0].[TIMECARDDATE] = @p3)
 GROUP BY [t0].[LNAME]

Now when I plug in the EXACT same values that the linq query is using into the generated query, I get the correct data. When I let the code run, I get nothing.

Any ideas?

Answer 1

What type is TIMECARDDATE? Date, datetime, datetime2, smalldatetime, datetimeoffset or character?

Any chance local date/time settings are messing up the date comparison of startDate.ToString(...)? Since you’re sending @p3 as a string, 01/02/2009 may mean Feb 1st or January 2nd, depending on the date/time setting on the server.