ADO.NET :: Use Of PATINDEX Function In Select Clause With Linq?
Sep 6, 2010i have an problem to use of PATINDEX function in select clause with Linq.
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[Code]....
ADO.NET :: Linq And Dynamic Where Clause With Wildcard?
Mar 25, 2011Linq add wildcard in the where clause dynamically I have a query, i.e.
var query = from r in context.company .....
then have some business logic and based on the validation I want to add dynamically a where clause
if(a == "1")
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Entities ctx3 = new Entities();
var uniqueQuote = from quot in ctx3.Quotes.Include("aspnet_Users").Include("Enquiries")
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SQL Server :: Select Statement With Where Clause?
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SQL Server :: Aggregate Function In Group By Clause?
Apr 1, 2011can i use aggregate function in group by clause like below mentioned query (which marked in red color)
[code]....
SQL Server :: Can Use Aggregate Function In Group By Clause
Feb 9, 2011can i use aggregate function in group by clause like below mentioned query (which marked in red color)
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DataSource Controls :: Linq - Update Statement Where Clause?
May 25, 2010I am using Linq to SQL. Tables have timestamp columns and I am using regular Linq methodology in ASP.NET MVC.I do use detached entities and always try to do updates without first querying the database for the original entity. To update an entity I use context.Attach(entity, true) followed by context.SubmitChanges() and all is fine. The sql statement that gets executed looks like:
[Code]...
DataSource Controls :: Use Stored Procedures From LINQ With A Using Clause ?
May 25, 2010Ive created a new LINQ To SQL class and dragged several tables across from my server, in my code I access them like this
[Code]....this is all ok, however, I have several stored procedures that I want to use as well, but when I drag the stored procedures across I get a compilatiopn error
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how do I use stored procedures from LINQ with a using clause ?
C# - Clause Is Used Inside Linq Statement Produces Different Results Than When Used Outside?
Aug 8, 2010I have the following statement:
List<string> tracks = new List<string> { "ABC", "DEF" };
var items = (from i in Agenda.AgendaSessions
select i).Where(p => p.Tracks.Any(s => tracks.Contains(s.Code)));
this returns all sessions which track contains either ABC or DEF, now when I rewrite the statement like the following, it returns All sessions regardless, as if the clause always yeilds into true,
var items = from i in Agenda.AgendaSessions
where i.Tracks.Any(s=> tracks.Contains(s.Code))
select i;
Update
if there are other clauses within the where, does that affect the results?
DataSource Controls :: Select Distinct With Where Clause Don't Work?
May 2, 2010I'm using asp.net login on a SQL Database.
I have 12 users in my User tabel - one of the user I don't want to have in my select (the user is an admin).
I tried this:
[Code]....
I also tried:
WHERE (dbo.aspnet_Roles.RoleName <> 'Administrators')
Both time it took the user into the table....
If I instead try this
WHERE (dbo.aspnet_Roles.RoleName = 'Administrators')
I get only one row (as expected).
What is wrong with the above sql statement - why can't I get 11 users and not them all (12 users)?
DataSource Controls :: LINQ To Entities Sub - Query - Doesn't Support The "IN" Clause
Apr 7, 2010I'm having trouble writing what should be a simple sub-query using LINQ to Entities. I have two tables: Customers and Orders that have a relation on the CustID field. Not all Customers have a record in the Orders table, while some have mutiple records. In traditional SQL, you could write the query like this: SELECT * FROM Orders where CustID IN (SELECT CustID FROM Customers) I know this could be done as a JOIN in both SQL and L2E, but my actual query is more complex (about 8-9 joins), so I am hoping to find a L2E sub-query equivalent. Something like this:
[Code]....
I know LINQ to Entities does not support the " IN " clause, so I am looking for something that will work in its place.
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Dec 7, 2010I am not able to understand what is the problem with My sql ..as same query is run sucessfully while i use SQL Server 2005 whit out any Exception or error.........
Select Count( Date ) From Attendancemaster
Error in SELECT clause: expression near ')'.
Unable to parse query text.
this is very simple query run sucessfully in SQL Server 2005 but not in
MY SQL and giving Error..and the query on which any datetime avar comes in WHERE clause allso generate error always....?
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View 3 RepliesC# - Linq To SQL Where In Clause Causes Object Not Set To Instance Of Object
Jul 1, 2010I have two tables, subscriptions and topics. Each subscription is related to a specific TopicID (PK for topics table). The first query works fine and retrieves the topicID's of all videos that were uploaded today. The problem occurs when I try and then use the results of query1 as a where-in clause for query 2. I keep receiving object reference not set to instance of an object.
Query 1 IQueryable<int> topics = (from t in dataLayer.Videos
where SqlMethods.DateDiffDay(t.DateCreated, DateTime.Today) == 0
select t.TopicID).Distinct(); [code]....
I have looked at some samples around the net and they all seem to be identical to mine.
C# - Use Linq To Sql To Select One Column From Row?
Dec 18, 2010I am using this C# with linq to sql:
string currentLabel = from s2f in stream2FieldTypesTable
where s2f.s2fID == item.s2fID
&& (s2f.s2fLabel != item.s2fLabel || s2f.s2fIsRequired != item.s2fIsRequired)
select s2f.s2fLabel;
I am getting a compiler error saying i can't assign type System.Linq.IQueryable<string> to string.
I tried this code:
string currentLabel = from s2f in stream2FieldTypesTable
where s2f.s2fID == item.s2fID
&& (s2f.s2fLabel != item.s2fLabel || s2f.s2fIsRequired != item.s2fIsRequired)
select s2f.s2fLabel.ToString();
And that returns the same error. I'm sure this is a simple thing. what am I missing? I just want the first s2fLabel that matches the where clause.
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var query = from log in context.Logs select log;
query = query.Where(Log => Log.Timestamp > CustomReport.ReportDateStart);
query = query.Where(Log => Log.Timestamp < CustomReport.ReportDateEnd);
[code]...
ADO.NET :: Linq Select Null Value?
Oct 7, 2010[Code]....
[Code]....
I have to get the maximum of these two select values. The select values are nullable. How do I go about checking if the value is null before calling the Max() method on it? I tried the ?? coalesing operator (example: e.HomeSales.Max() ?? 0M,) but I get the following error:"Operator '??' cannot be applied to operands of type 'decimal' and 'decimal'"
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View 6 RepliesADO.NET :: Apply Add Hour Function In Linq?
Jan 22, 2011var LateChangesTodate = (from lt in entities.Histories
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[code]...
Is There A Way To Select Certain Rows And For Each Row, Perform A Function
Nov 26, 2010Is there a way to select certain rows and for each row, perform a function? Specifically, I want to select specific rows and then send them an email.
Here's a breakdown:
1. Select * from STUDENTS where status = active
2. For each row that is returned, take the $email column and email the student message
3. Repeat until all qualifying rows have been completed.
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SQL Server :: Use Function In Select Statement?
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[Code]....