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• remove schema from linq datacontexts

  - by Jeremy

  When I add stored procedures to a linq datacontext, by default visual studio prefixes the stored procedure with the sql schema that it is in. Is there any way to stop this? In our environment, the stored procedures may be moved to other schemas over time, and we will default the schema based on the sql user used to connect. Do I have to do this manually or can I somehow turn off the schema prefixes?

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• linq multiple condition on "on" clause

  - by swapna

  I have a query which have multiple conditions on on clause select * FROM CATALOGITEM with (nolock) INNER JOIN CATALOG with (nolock) ON CATALOGITEM.catalog_id = CATALOG.catalog_id and not(catalog.catalog_id = 21) and not(catalog.catalog_id = 20) WHERE ( CATALOGITEM.publish_code = 'upd' OR CATALOG_ITEM.publish_code = 'ins' OR PRODUCT.publish_code = 'upd' OR PRODUCT.publish_code = 'ins' ) How to write this in linq. Please advice.

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• linq, selecting columns as IEnumerable<DataRow>

  - by joe

  how can i do in linq: IEnumerable<DataRow> query = from rec in dt.AsEnumerable() where rec.Field<decimal>("column2") == 1 && foo(rec.Field<decimal>("column1")) select new { column1 = rec.Field<decimal>("column1"), column2 = rec.Field<decimal>("column2"), column3 = rec.Field<decimal>("column3")} ; this does not work. Im trying to select some columns as new datatable then join it later with some other datatable.

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• Linq to Sql get SqlCommand when stored procedure execution fails

  - by Tim Mahy

  Hi all, currently I'm assigning a TextWriter to the Log property of my Linq to Sql data context (per request instancing) and write this to my logging when an exception is thrown while executing a stored procedure (is strongly typed mapped in the context, so not executing a custom command) however when using ADO.NET we normally inspect the SqlCommand upon unhandled exception to read out the parameters and log them is it possible to access the SqlCommand that was used for executing a Stored Procedure in L2S so we can reuse that existing logging component? This would be far nicer than the current Log TextWriter solution.... greetings, Tim

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• How to use group by and having count in Linq

  - by Luke

  I am having trouble trying to convert the following query from SQL to Linq, in particular with the having count and group by parts of the query: select ProjectID from ProjectAssociation where TeamID in ( select TeamID from [User] where UserID in (4)) group by ProjectID having COUNT(TeamID) = (select distinct COUNT(TeamID) from [User] where UserID in (4)) Any advice on how to do so would be much appreciated.

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• Translate SQL query to LINQ

  - by ile

  PhotoAlbums table AlbumID Title Date Photos table: PhotoID Title Date AlbumID SELECT AlbumID, Title, Date, (SELECT TOP (1) PhotoID FROM Photos AS c WHERE (AlbumID = a.AlbumID)) AS PhotoID FROM PhotoAlbums AS a I need this query written in LINQ-to-SQL. Thanks in advance

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• Using linq, database doesn't have FK relations to tables

  - by mrblah

  Hi, I have a database that has primary key fields in its tables, but the FK mappings are not in place. What are the ramifications of this when using linq-to-sql?

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• Linq to SQL Compact - Transaction or just SubmitChanges

  - by eWolf

  I'm using Linq to SQL on an SQL Compact database. I have a function where I insert multiple records into the database. I only call SubmitChanges at the end of the function. Would using a transaction (using the TransactionScope class) bring me any more performance or advantages?

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• *Right* outer join in LINQ

  - by Rap

  Is it safe to say that there is no such thing as a right outer join in LINQ? I know to effectively create one, you'd just swap the tables in a left outer join. But can you apply the DefaultIfEmpty() method to the table on the left side of the equijoin to make it a right outer join?

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• Linq-To-Sql equivalent for this sql query...

  - by Pandiya Chendur

  I thus far used concatenated Id string like 1,2,3 and updated in my table using this query... if exists( select ClientId from Clients where ClientId IN (SELECT i.items FROM dbo.Splitfn(@Id,',') AS i)) begin update Clients set IsDeleted=1 where ClientId IN (SELECT i.items FROM dbo.Splitfn(@Id,',') AS i) select 'deleted' as message end What is the linq-to-sql equivalent for the above query? Any suggestion...

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• LINQ to group objects according to timestamp

  - by Benny

  I have a serial of object defined as: public class Foo { public DateTime Time {get;set;} } now I want to group objects(IEnumerable<Foo>) according to the time, e.g. I want to group them according to hour or day or month. for example (group into hour): group 1(13:00-14:00) : foo1, foo2, foo3 group 2(14:00-15:00): foo4, foo5 How to write LINQ over this? hope I made myself clear.

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• LINQ to SQL entity and data-context classes: business object encapsulation

  - by roosteronacid

  What are your favorite ways to encapsulate LINQ to SQL entity classes and data-context classes into business objects? What have you found to work in a given situation? Have you invented or taken to any specific patterns?

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• LINQ VB.NET variable not found when looping through grouped query

  - by Ed Sneller

  I'm trying to do the following LINQ grouping, which works in the debugger (the results are populated in the GroupedOrders object. But VS 2008 gives me the following error at design time... Name 'x' is not declared Dim GroupedOrders = (From m In thisConsultant.orders _ Group m By Key = m.commCode Into Group _ Select commCode = Key, orders = Group) For Each x In GroupedOrders Next VS 2008 gives me the following error,

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• Linq to Object -Object update

  - by nettguy

  In LINQ to Object context ,can i update an object in memory. I mean i can create new type like var query =from e in empList select new {id=e.id,salary=e.salary * (10/100) }; can i update an object?

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• Am I missing something about LINQ?

  - by Jason Baker

  I seem to be missing something about LINQ. To me, it looks like it's taking some of the elements of SQL that I like the least and moving them into the C# language and using them for other things. I mean, I could see the benefit of using SQL-like statements on things other than databases. But if I wanted to write SQL, well, why not just write SQL and keep it out of C#? What am I missing here?

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• Setting options with Linq

  - by boris callens

  I'm in a situation where I want to add the equivalent of the sql statement SET QUERY_GOVERNOR_COST_LIMIT to my query I created with linq to entities. How would I go about that?

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• What are the Java equivalents to Linq and Entity Framework

  - by Colin Desmond

  Having played with Linq (to SQL and Objects) as well as the Entity Framework from Microsoft recently, I was wondering what the non-.Net (specifically Java) equivalents are?

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• LInq to sql query

  - by Mohit

  Hi, I have a sql query as follows: Declare @DivisionNo INT SET @DivisionNo = 5117 SELECT distinct CASE WHEN ISNULL([DivisionNo],'') < @DivisionNo THEN @DivisionNo ELSE [DivisionNo] END as DivisionNo --,[RecordID] ,[AcctCat] ,[AcctCatDesc] ,[CostCode] ,[CostCodeDesc] FROM [dbo].[vw_eSchdl_AcctCat_CostCode] WHERE DivisionNo = @DivisionNo UNION SELECT distinct CASE WHEN ISNULL([DivisionNo],'') < @DivisionNo THEN @DivisionNo ELSE [DivisionNo] END as DivisionNo --,[RecordID] ,[AcctCat] ,[AcctCatDesc] ,[CostCode] ,[CostCodeDesc] FROM [dbo].[vw_eSchdl_AcctCat_CostCode] WHERE AcctCat not in ( SELECT [AcctCat] FROM [dbo].[vw_eSchdl_AcctCat_CostCode] WHERE DivisionNo = @DivisionNo) How can I duplicate it using linq to sql? Thanks

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• Joins and subqueries in LINQ

  - by Brian

  I am trying to do a join with a sub query and can't seem to get it. Here is what is looks like working in sql. How do I get to to work in linq? SELECT po.*, p.PermissionID FROM PermissibleObjects po INNER JOIN PermissibleObjects_Permissions po_p ON (po.PermissibleObjectID = po_p.PermissibleObjectID) INNER JOIN Permissions p ON (po_p.PermissionID = p.PermissionID) LEFT OUTER JOIN ( SELECT u_po.PermissionID, u_po.PermissibleObjectID FROM Users_PermissibleObjects u_po WHERE u_po.UserID = '2F160457-7355-4B59-861F-9871A45FD166' ) used ON (p.PermissionID = used.PermissionID AND po.PermissibleObjectID = used.PermissibleObjectID) WHERE used.PermissionID is null

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• Total of float column in linq query

  - by Krummelz

  I have a linq query, that gets data from a table in a DataContext object. One of the columns in this table has a Datatype of float. I would like to get the total of that specific column. How could I go about doing this?

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• LINQ Single vs First

  - by BahaiResearch.com

  LINQ: Is it more efficient to use the Single() operator over First() when ever I know for certain that the query will return a single record? Is there a difference?

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• Sequential GUID in Linq-to-Sql?

  - by JacobE

  I just read a blog post about NHibernate's ability to create a GUID from the system time (Guid.Comb), thus avoiding a good amount of database fragmentation. You could call it the client-side equivalent to the SQL Server Sequential ID. Is there a way I could use a similar strategy in my Linq-to-Sql project (by generating the Guid in code)?

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• switch linq syntax

  - by scrat789

  var folders = from r in this.bdd.Rights join f in this.bdd.Folders on r.RightFolderId equals f.FolderId join rs in this.bdd.RightSpecs on r.RightSpecId equals rs.SpecIdRight where r.RightUserId == userId where rs.SpecRead == true where rs.SpecWrite == true select f; How transform this linq query in the other syntax? var folders = this.bdd.Rights.Where(r => r.....

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• NHibernate LINQ + PLINQ

  - by cvista

  Hi i've just started reading up on PLINQ and find it fasinating. I'm using NHib-Linq in my projects - does anyone know if there's any benefit/problems using PLINQ type queries with NHLinq? w://

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• Dynamically set sproc name in Linq to SQL?

  - by Justin

  Hey, I need to dynamically set the sproc name of a Linq to SQL query and can't figure out how. I see in the dbml designer that the sproc name is an attribute but it must be a constant, so I can't set it to a dynamic value. Please help. Thanks, Justin

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