i want take a single value result from linq query
if i have :[Code]....
the variable result does not return nothing, only tostring() and similar how can i get a single result from linq query and use it in my ID variable?
For context: First of all, I am new to LINQ, as I have been using SubSonic for quite some time now.
I have two tables, Users, and Affiliates. They both have a very typical schema. The FK that joins them is the UserId field, which is in the Affiliates table. I want to create a LINQ query that pulls the Username from the Users table using the AffiliateId value. The AffiliateId is a primary key of the Affiliates table.
I have tried to accomplish this using many variations of the following code:
[Code]....
In the above query, I expect to get a single row result set. However, I instead receive the entire table of results.
How can I make this work? I have yet to see an example or article out there to do what I am trying to do.
I have this ListView that has a Drop Down List.Everything works fine (I think/hope) except that the drop down list are not showing its result correctly.This is the code.
Front-End
[Code]....
The code behind consist of the page_load and the ItemDataBound
[Code]....
I'm having a problem with my Linq to XML query. I'm getting the result data I want, but it's nested so deep that there must be a better way.Here is my XML:
[Code]....
I'm trying to get a list (simple string[]) of all Item IDs where Category Names contains "Other".Here is my Linq:
[Code]....
[Code]....
Here is a snapshot of my result from Visual Studio:The results I want are there ("item100", "item400", "item500"), but buried so deeply in the results var.
How can I get the query to return a simple
string[] = { "item100", "item400", "item500" }
I Pieces
NA 400
How can I use Order by on the result of a LinQ to SQL query ?
I have the following Situation:
Dim ret As New Object
ret = From status In tableStatus _
Select status.STATUS_ID, _
Text = Function_GetText(status.TEXT_ID)
Now I have to order this result on the field Text, has anyone an idea? (I can't use in my case Orde by Function_GetText(status.TEXT_ID))
How to randomize a LINQ query result?
Below takes 4 of the records but it won't randomize in every request. [:(]
Dim products = (From p In Northwind _
Order By Guid.NewGuid _
Select New With { _
.Name = p.Name, _
})
Return products.Take(4).ToList()
New to Linq and Var type have a method where linq query is executed, want to return the result and assign it to GridView. but method don't take the return type as var.
So was wondering how do i return this query result?
Should i assign this result to DataTable first and make the method return type as DataTable?
Here is the code, This is what i want to do but not sure what is the right way
[Code]....
for example,
var result = from category in myEntities.Categories
where category.UserId == userId
orderby category.CategoryName
select category;
What is the type of "result"? I casted it to an IQueryable variable and it worked except it did not have some of the methods normally available, e.g. Count(). In my program I have to cast it to some explicit types and then use the Count() method.
I am running a LINQ query which populates a list used by a DropDownList, I need to insert an "Unassigned" value to the list. The function below queries the values correctly from the db but does not insert the "Unaasinged" value to the list.
[Code]....
i have a new question: i read all the tutorials that i found but i cannot understand how to pass a result of a linq to entities result to the view so that i can display the results. My query is actually in the controller function ot the view, i would now loop the results and display them in the page. How?
View 23 RepliesI am new to this, and I am trying to implement a linq query similar to db.Genres.Include("Albums") command from
mvc music store using my current DB setup. I realize that the tutorial mentions Checlking the "Include foreign key columns in the method" when creating the tables in ADO.NET, but if I am using LINQ to SQL classes, then how can I obtain the same effect. And how do I use
db.Genres.Include("Albums") to simplify my life?
How do i check if linq insert/update query was successfull or how many rows were added/updated?
View 1 RepliesBackground: I use stored procedures exclusively for an ASP.NET application. I am using a DataReader to load a dataset object.
View 4 RepliesI have this code in my controller:
public ActionResult Details(int id)
{
using (var db = new MatchGamingEntities())
[code]...
I am developing asp.net mobile application. I am using XML as a database. I am querying on the XML to access the required elements & attributes by using LINQ to XML in .net. I have the follwing part in my XML file.
[code]....
The similar logic I need for the above defined XML part. In the above XML I want to write the LINQ to XML query which can access the NAME attribute of the 'VALVE' node (<VALVE NAME="PWV">), then it should access the text between 'DISPLAY-NODE' (<DISPLAY-NAME> Production Master Valve </DISPLAY-NAME>), & then it should access the all the attributes of the 'COMMAND' node dynamically ( <COMMANDS USE-TEMPLATE="TRUE" TEAMPLATE-NAME="ValveCommands.xml"></COMMANDS>). All these I want dynamically without explicitly specifying the name of the child node as well as name of their attributes ( similar to the way I written the above query ) Can we write such a code by using LINQ to XML ? It will be better if we can write code for above issue in a single logic ( similar to the way I written the above query ).
I'm looking to translate an SQL query into linq
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.
I am trying to display this query result in an aspx page.
It is very slow in loading. Here is the query. The inner query inside the outer quesry is the problem.(Please see the underlined part in the query) - (If I remove that part it is very fast.)
select
top 500
--This column is the issue
,Governing_Class=( case when exists (select top 1 tqc.class_code from
t_quote_class tqc
inner join t_quote_class_premium tqcm on tqc.class_code =tqcm.
class_code
where tqc.appid=pi.appid and tqc.class_code not in('8742' ,'8810','7380')
order by tqcm.premium_amt desc
)
then ( select top 1 tqc.class_code from
t_quote_class tqc
inner join t_quote_class_premium tqcm on tqc.class_code =tqcm.
class_code
where tqc.appid=pi.
appid
order by tqcm.premium_amt desc
)
......... From tables
i have tow query in one stored procedure
first query and the second one every of them return only value
i want to copy the result of tow values in a new row in new table
as i want to check on this tow values in ado.net
i want to get only this tow values as a row not first and secon query
only a row has result of first and second query results
[Code]....
I want to use "if statement" in Linq query. How can I do this situation?
For example:
if txtAge.Text=="", I will not use that in Linq Query.
else txtAge.Text!="", I will use that in Linq Query.
I've build a linq query.But i want a random selection so its not always ID : 1,2,3,4,5,6 How can i randomize this var? I like to bind it to a repeater.//TagCloud:
Random rand = new Random();
var tc1 = from i in JumpTide.cms.menu.GetMenuItems(32)
select new
[code]...
I am trying to return single string result through a stored procedure and Linq. This works fine when I test the stored procedure but it is not returning the value to the page. The value returned is always 0 which is the return value. This is the stored procedure:
ALTER PROCEDURE Login
@CustomerName nvarchar(50),
@Password nvarchar(50) output
As
Select @Password=Password
From Customers
Where Customers.CustomerName=@CustomerName
This is the vb
ALTER PROCEDURE Login
@CustomerName nvarchar(50),
@Password nvarchar(50) output
As
Select @Password=Password
From Customers
Where Customers.CustomerName=@CustomerName is the code created by the designer
This is the designer function
<FunctionAttribute(Name:="dbo.Login")> _
Public Function Login(<Parameter(Name:="CustomerName", DbType:="NVarChar(50)")> ByVal customerName
As String, <Parameter(Name:="Password", DbType:="NVarChar(50)")> ByRef password As String) As IntegerDim result
As IExecuteResult = Me.ExecuteMethodCall(Me, CType(MethodInfo.GetCurrentMethod,MethodInfo), customerName, password)
password = CType(result.GetParameterValue(1),String)
End Function
I use the follwoing code to get a value from the SQL query. But now i would like to use some sql function like Sum() count() ... and i would like to get the result of that.
vb Code:
Dim constg As New SqlConnection
constg.ConnectionString = "Data Source=m......."
constg.Open()
Dim payrollquery As String '= ("SELECT * FROM xxxxx.nnnnn WHERE ID IN(" & ID & " ) AND sent = 'U' ")
Dim cmd3 As New SqlCommand(sqlstr, constg)
Dim reader As SqlDataReader = cmd3.ExecuteReader
select Groupid,GroupName,onorusername from palgroup where groupid in (select distinct Groupid
View 5 Repliesi need to make 2 funtions on an ASP.NET c# page working with an SQL server (using Visual Web Developer 2010 Express) the 1st one is a simple serach and i've done the 2nd thing is an update , the sp is like:(it works in SQL)
UPDATE [lens] SET [qty] = @b+@c WHERE [id] = @a
@a is the id which user input in the textbox1
@b is an number user input in the textbox2
now @c should be the result of an query "select [qty] from [lens] where [id] = @a"
so ,the new value of [qty] will be the "old valus"+"valus in textbox2"