Question

I am using a DB2 provider to hit a database on an AiX Server. Here is the LINQ statement I am using to that returns an anonymous type.

var docs = (from a in WIP
            where (!dtFrom.HasValue && !dtTo.HasValue) || (a.QBE_DT.Value >= dtFrom.Value && a.QBE_DT.Value <= dtTo.Value) && a.STATUSCODE != "X" && a.KEY1 != "CABS" && a.KEY1 != "BPI"
            group a by new
            {
                a.BATCH_ID,
                a.POLICY_NUM,
                a.QBE_DT
            } into grp
            select new
            {
                BatchId = grp.Key.BATCH_ID.Trim(),
                BatchGroup = grp
            }).ToList();

The return from this is causing the Provider to timeout, throwing a Process has been canceled due to an interrupt error. My thought is if I “Take” a subset of the recordset, this issue will go away. The issue I have, is I cannot simply add a Take(100) before the ToList(), because it throws:

SQL0418N A statement contains a use of an untyped parameter marker, the DEFAULT keyword, or a null value that is not valid. SQLSTATE=42610

I wish I was able to see the SQL generated to make sure it is the right syntax, but I don’t know how to in this situation. Is there an elegant way to get the first X Elements from above LINQ statement?

Answer 1

The workaround for this was to do the grouping and filtering in memory and getting a larger amount of data back from the source