C# - LINQ Timed Out While The Same Query Works In SQL?
Jan 16, 2011I am getting
[code]....
When I run the SAME query in the SQL query program I get result within seconds, and in LINQ it takes forever and fails.
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INNER JOIN Usrs ON
SAQ.UserId =
Usrs.UserId AND Scan.UserId =
Users.UserId
I'm not sure how to include the "AND" in the LINQ statement.
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var tc1 = from i in JumpTide.cms.menu.GetMenuItems(32)
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[code]...
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View 5 RepliesADO.NET :: How Does Data Retrieval Works For Linq
Mar 28, 2011I was looking over the Create a Movie Database Application in 15 Minutes with ASP.NET MVC (C#), and it used entity framework and I saw this code.
[Code]....
I am just wondering, does this mean, this code actually downloads ALL the data from the SQL server for that table, and then filters where the Id matches, and then is stored in the var originalMovie? I have seen the "Linq to SQL", does this send this as sql query to the SQL server, and therefore only the relavent rows are returned from SQL server?
Linq Query Returning Less Records Than Sql Query?
Mar 19, 2011I am facing a big problem with simple linq query.. I am using EF 4.0..
I am trying to take all the records from a table using a linq query:
var result = context.tablename.select(x=>x);
This results in less rows than the normal sql query which is select * from tablename;
This table has more than 5 tables as child objects (foreign key relations: one to one and one to many etc)..
This result variable after executing that linq statement returns records with all child object values without doing a include statement.. I don't know is it a default behavior of EF 4.0 . I tried this statement in linqpad also..but there is no use... But interesting thing is if I do a join on the same table with another one table is working same is sql inner join and count is same..but I don't know why is it acting differently with that table only.. Is it doing inner joins with all child tables before returning the all records of that parent table?
Linq Query - How To Select Inner Query Into List
Oct 17, 2010I am writing a linq query to select a blogpost,
[code]....
The blogpost i am testing got 3 tags attached to it. The table structure is:
(table)BlogPost -> (table)BlogPostTags <- (table)Tags
So the BlogPostTags table only contains 2 fields, BlogPostID and TagID.
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SQL Query Works In Management Studio But Not In C#
Mar 21, 2011I have a problem doing a query with my software. I have a function which builds my query, and then execute it to fill a gridview. But it keep throwing me an exception : "The multi-part identifier "" could not be bound" with several columns. When I try the query in SQL Management Studio, it just works fine. I really don't understand. Here's the query.
SELECT DISTINCT [NonConformite].[Numero],
CAST ([NonConformite].[Numero] AS varchar (255)) AS Champ1,
CAST ([NonConformiteDonneesComplementaires177_4].[Texte2] AS varchar (255)) AS Champ2,
CAST (NonConformite.dbo.[NonConformiteStatut].[Libelle] AS varchar (255)) AS Champ3,
CAST ([NonConformite].[Description] AS varchar (255)) AS Champ4 FROM [NonConformite].[dbo].[NonConformite]
LEFT JOIN NonConformite.dbo.[NonConformiteDonneesComplementaires] as NonConformiteDonneesComplementaires177_4
ON [NonConformite].[Numero] = [NonConformiteDonneesComplementaires177_4].[Numero]
LEFT JOIN NonConformite.dbo.[NonConformiteStatut]
ON [NonConformite].[CpteurStatut] = NonConformite.dbo.[NonConformiteStatut].[Cpteur]
I work on Windows 7 Pro, with Visual Studio 2008, SQL Server 2008 and in ASP.NET C#.
ADO.NET :: LINQ Entity Framework Query - Construct "nested" Query?
Jan 22, 2011I have a web app for our golf club. When I compute handicap index for each golfer, I have to select the most recent scores and then a subset of those scores depending on how many rounds of golf the golfer has played. All the scores are entered into a single SQL Express table called "Rounds". Verbally, this is what I'm trying to do:
1) select the twenty most recent golf scores (sort on date descending, "take(20)") [if less than 20 records, then select all available];
2) for this set of records, select the 10 lowest scores (or smaller number if golfer has less than 20 rounds);
3) compute the average round differential for the subset of records, etc. to calculate handicap index (this step is working ok...)
My current VB code has this LINQ query (which is flawed -- it selects the lowest handicap differential scores of ALL records for the filtered user):
[Code]....
How do I modify this query to accomplish items 1) & 2) above? It seems this should be simple, but my experience with queries is still limited.
ADO.NET :: IN Query, Linq To Sql?
Aug 2, 2010I have a list which contains few email ids
List<string> EmailId= { ....}
Now I have a db table Users. I need to select all users whose email exist in the above list. In sql we could write "where emailid in ('email1', email2' ,...)"
how to do this in linq to sqlquerable<Users> existingUsers = Users.getTable().where (u=>u.emailaddress in EmailId). I want to do some thing similar
ADO.NET :: Not Sure How To Do This Query In Linq To Sql
Sep 12, 2010I need to figure out how to express this in linq to sql:I have one or more records that contain what is essentially a wildcard sql parameter, like '100_-___-2', which should match 100[any 1 char]-[any 1 char][any 1 char][any 1 char]-2, for example. Each login will have one or more of these 'datamasks' associated with it.I need to write a query in linq to sql that does something like:
select * from something
where fieldA = 'someValue' or fieldB = 'someValue'
so far, simple, but I also need to restrict the returned records to only those that match the user's 'datamasks'. I'm not sure exactly how to translate this to linq to sql... here is what a working query *without* the datamasks part looks like:
[Code]....
I need to tack on the datamasks part... can I do it right there in the same statement? or do I need to do a foreach loop on the datamasks records and append a new && condition for each one? hmmm... just thought of that as I was writing this.. I'll try that out. But I'm posting this anyway for more input... I guess that would look something like:
foreach (string mask in datamasks)
{
query = query.Where(item =>
System.Data.Linq.SqlClient.SqlMethods.Like(item.AccountNum, mask));
}
would that work? would each additional 'where' condition be 'appended' to the existing query definition?
Many To Many LINQ TO SQL Query
Mar 11, 2010Users
Roles
UserRoles
MenuItems
RoleMenuItems
A User can have multiple Roles and a MenuItem can be accessed by multiple Roles. Now I want to write a method as follows:
public IList<MenuItems> GetMenuItems(UserRoles userRoles)
{
var menus = // LINQ query to get the MenuItems by UserRoles
return menus.ToList();
ADO.NET :: How To Use Linq Query Union
Aug 31, 2010I need to use Union for below Linq queries. I could use Union it if it was simple "select new whith{" but Now that I Specified Class, I encounter Error using union
[Code]....
Need To Use The Like Operator In A Linq Query?
Apr 28, 2010i need to use the like operator in a linq queryfor this:
timb = time.Timbratures.Include("Anagrafica_Dipendente")
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.net - LINQ-Query Is Not Working?
Dec 13, 2010Table User (UserID, Username)
Table Admin (AdminID, Username)
Table PM (PMID, SenderID, Sendertype, RecipientID, RecipientType)
Get all Information from PM
if SenderType == 'A' join SenderID to Admin-Table, get Username
if SenderType == 'U' join SenderID to User-Table, get Username
if RecipientType == 'A' join RecipientID to Admin-Table, get Username
if RecipientType == 'U' join RecipientID to User-Table, Get Username
someone have an Idea how to solve in 1 query?
Possible To Do A Linq Query On A GridView ?
Sep 13, 2010I have a datakey that I'd like to query from my GridView instead of looping through all the rows and comparing the key of each row. So I was wondering if it was possible to just do a linq query on the gridview (not datatable) and filter with the datakey.
View 4 RepliesWay To Filter LINQ Query
Feb 17, 2011I need to filter LINQ query using comboboxes and textboxes. The problem is I can't manage to get the result and I always get the empty gridview (used for showing filtered data). Can anyone help me why am I getting no results at all? I've checked the debugger and the data sent to query is valid, although, I'm not sure about "string.Empty" value.
string naziv, nazivEn, adresa, tel, fax, mob, email, web, oib, tip, mjesto;
if (chkMjesto.Checked == true)
{
mjesto = cbMjesto.SelectedItem.Text;
}
[code]....
.net - Linq And SQL Query Comparison
Apr 4, 2011SELECT Sum(ABS([Minimum Installment])) AS SumOfMonthlyPayments FROM tblAccount
INNER JOIN tblAccountOwner ON tblAccount.[Creditor Registry ID] = tblAccountOwner.
[Creditor Registry ID] AND tblAccount.[Account No] = tblAccountOwner.[Account No]
WHERE (tblAccountOwner.[Account Owner Registry ID] = 731752693037116688)
AND (tblAccount.[Account Type] NOT IN
('CA00', 'CA01', 'CA03', 'CA04', 'CA02', 'PA00', 'PA01', 'PA02', 'PA03', 'PA04'))
AND (DATEDIFF(mm, tblAccount.[State Change Date], GETDATE()) <=
4 OR tblAccount.[State Change Date] IS NULL)
AND ((tblAccount.[Account Type] IN ('CL10','CL11','PL10','PL11')) OR
CONTAINS(tblAccount.[Account Type], 'Mortgage')) AND (tblAccount.[Account Status ID] <> 999)
[code]....
C# - Test If Linq Query Went Through?
Mar 15, 2011This is my code from my controller:
MGEntities db = new MGEntities();
[HttpPost]
public ActionResult Register(RegisterModel model)
{
if (ModelState.IsValid)
{
// Attempt to register the user
MembershipCreateStatus createStatus = MembershipService.CreateUser(model.UserName, model.Password, model.Email);
if (createStatus == MembershipCreateStatus.Success)
{
FormsService.SignIn(model.UserName, false /* createPersistentCookie */);
MembershipUser myObject = Membership.GetUser();
Guid UserID = (Guid)myObject.ProviderUserKey;
MyProfile profile = new MyProfile();
profile.Address = model.Address;
profile.City = model.City;
profile.Zip = model.Zip;
profile.State = model.State;
profile.UserId = UserID;
Debug.Write(profile.State);
db.aspnet_Profiles.Add(profile);
return RedirectToAction("Index", "Home");
}
else
{
ModelState.AddModelError("", AccountValidation.ErrorCodeToString(createStatus));
}
}
This is my MyProfile Class:
namespace MatchGaming.Models
{
[Bind(Exclude = "ProfileId")]
public class MyProfile
{
[Key]
[ScaffoldColumn(false)]
public int ProfileId { get; set; }
public Guid UserId { get; set; }
[DisplayName("Address")]
public string Address { get; set; }
[DisplayName("City")]
public string City { get; set; }
[DisplayName("Zip")]
public string Zip { get; set; }
[DisplayName("State")]
public string State { get; set; }
}
}
After the linq query is executed, i check my database and nothing is added. I am using POCO for my entities. Here is my class:
namespace MatchGaming.Models
{
public class MGEntities : DbContext
{
public DbSet<MyProfile> aspnet_Profiles { get; set; }
}
}
ADO.NET :: Convert Sql Query In Linq?
Oct 2, 2010how convert this sql query in linq,
SELECT COUNT(AdvisorID) AS AdvisorRegisterLast2Days FROM ob_Advisor WHERE CONVERT(varchar,CreationDate,101) BETWEEN CONVERT(varchar,DATEADD(day,-4,DATEADD(day,2,GETDATE())),101) AND CONVERT(varchar,GETDATE(),101)
C# - Set A Value On A Linq Object During The Query?
Feb 16, 2010I have a simple query i.e.
var trips = from t in ctx.Trips
select t;
The problem is that I have an extra property on the Trip object that needs to be assigned, preferably without iterating through the returned IQueryable.
Does anyone know how to set the value during the query? (i.e. select t, t.property = "value")
C# - Get The Sql Created By A Linq Query?
Jan 18, 2010I've been developing a ASP.NET page and have been using LINQ to handle talking to MS SQL server. I'm ok at basic SQL, however I'm a lot better with designing queries using LINQ. I know they are similar but I find it easer to design complex queries in LINQ. My question is this: Is there a way to design a query in LINQ and then get the SQL that it generated? I would like to embed the SQL in a stored procedure since multiple pages (outside my control) will need to do the same query.
View 4 RepliesADO.NET :: Linq Query With Ordering?
Jan 28, 2011the best way to do the following (I'm using a simplified example of my actual problem?Say I have a customer ordered items table with fields: oItemId, OrderId, ProductId, ItemPriceI want to query where OrderId >oMin && OrderId <oMaxand for each value of OrderId I want to find the record with the highest ItemPriceso for a single OrderId the query would be:(from o in context.orderItems where OrderId==x orderby o.ItemPrice select o).first()but OrderId isn't a single value. If I modify the where clause then this query would still produce a single record whereas I want a single record per OrderId.oh and as an additional question: does anyone have a compact test for whether a record exists. I am using the querystring to specify an Id and there are numerous things that I want to protect against. If I do:
var myRecord = from o in context.orders where o.orderId == request.querystring["Order"] select othen this fails if the querystring isn't specified. So first I test that the querystring != nul . Then I need to do:bool recordExists = (myRecord != null)because even if the querystring is specified it may be an invalid orderId and thus the query returns no results. Is there a shorter/simpler way to calculate the result. I have not yet got to grips with lambda expressions and I'm not sure whether there is a better approach with lambda expressions.
Forms Data Controls :: ListView Not Returning Data But Query In Access Works
Mar 8, 2011I have a search box on a web application that is to use a query I have built in Access to search through projects to find any that are related to the text entered in the search box.
The query in Access is just made up of parameters that use wildcards to search through all the fields. In Access the query works fine and returns the correct data but when I try and link this all up to a ListView in Visual Studio, the ListView just diplays the message "No data was returned"
Below is my page-behind code, hopefully you can see why it is not working but it looks like it should work to me.
[Code]....