Using Statement With A Scalar Query?
May 30, 2012Can you show a coding example that has the "Using" statement with a scalar query?
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How To Write A Scalar Query In .NET From A SQL Database
Jul 11, 2011I am trying to write VB.NET query without writing SQL stored procs. I have already gotten many dataset text queries to work. But I am having trouble with getting this scalar query to work. All I want to do is to get the result of this T-SQL query. How can I code this successfully? select (DateDiff(w, '1/1/' + '2011', getdate())) / 7 AS SELECTED_WEEK (What this code does is it returns the current week of the year). And will this query above return the value as an integer datatype or string?
I tried your answers but it gave me this exception error:
System.InvalidOperationException: ExecuteReader requires an open and available Connection. The connection's current state is Closed.
Return The Count From Scalar Query?
Apr 1, 2009When I type in cntrows. I get all my table variables except the one I want which is TotalComments. How do I return the Count from my scalar query? I have a Table Adapter named :
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.net - List Of Scalar Values From Entity Framework Query?
Dec 22, 2011I have Customers table in a database. I'd like to create List of CustomerNames using entity framework 4.1. How can I do that in Visual Basic?
Dim customerNames = (From c In _context.Customers
Select New With {c.CustomerName}).ToList()
brings a list of anonymous objects.
.net - Linq Query If Statement?
Jun 24, 2011Ok im trying to do a if statement in Linq and was wondering if it was possible to do something like:
Dim loadFriends = From p In db.UserRelationships Where p.aspnet_User.UserName = User.Identity.Name _
Or p.aspnet_User1.UserName = User.Identity.Name And p.Type = 1 _
Select New With {if p.aspnet_user1.user = "a certan username" then .username = _
p.aspnet_user.username else .username = p.aspnet_user1.Username}
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Datagrid And Query : How To Use AND Statement
Nov 30, 2010In my Form1 i have a datagrid with coulmns: CarName , CarModel , CarColor , CarOwner (there are a lot of data).
I added queries (textboxes that the user writes in text) that can "filter" data when the user want to choose specific CarName or specific CarModel.
textbox1 = CarName
textbox2 = CarModel
textbox3 = CarColor
textbox4 = CarOwner
If the user writes text in TextBox1 then the data shown in the DataGrid is filtered.What if the user want to choose also (!) a carOwner? I know how to use AND statements, but if the user didn't specified a carOwner non of the data is shown although there are this kind of data.
Create A Conditional Statement After Sql Query ?
Sep 20, 2011I created a sql query to check if the mobile number is registered or not. If its registered, it will send the new pin code to the customer and if its not, the customer will get a message that "This number is not registered or you are not authorized to this"... something like that... Sending of new code is already working. I just dont know how to make it as conditional statement like PHP. After you query on PHP, you can just set a variable and make a conditional statement..Here is my script in vb.net:
Private Sub CheSMS()
Dim SQLServer As String = My.Settings.SQLServer
Dim conn As SqlConnection[code]......
How To Turn Query Into A LINQ Statement
Sep 30, 2009How can I turn the following query into a LINQ statement? [code]
View 1 RepliesTell If A LINQ To SQL Query Is Translated To A SQL Statement Or Not?
Oct 15, 2010We use LINQ to SQL extensively, and one of the biggest performance pitfalls we've run into is situations where a query can't be converted to SQL, and so an entire database table gets loaded into memory and the query performed by .NET. For example, this query
Dim Foo = (From c in Db.Contacts Select c Where c.ContactID=MyContactID)
translates to a simple SQL query, whereas
Dim Foo = (From c in Db.Contacts Select c Where c.ContactID=SafeInt(MyContactID))
doesn't because SafeInt is our own function and doesn't have a SQL equivalent; so the whole contacts table gets loaded into memory and searched by LINQ to objects, which is vastly slower. With a little experience, we've gotten better at avoiding this kind of situation. But it's not always obvious, and this is the sort of problem that's often not revealed until you're working with a lot of data and things start to slow down. Is there a straightforward way to see - whether in Visual Studio or some other way - how LINQ queries will be handled, other than trial and error?
.net - MySql Query Statement Syntax Error
Sep 6, 2011I am getting a syntax error for the code below.I am trying to create a user in the mysql database and add their information to a datagrid control all in one button click using two statements; one to create the actual user, and one to add the user and their additional information to a table on the database and then refresh the datasource which will display the new user's information in the datagrid control.
If anyone knows where i went wrong please feel free to critique my code and let me know; or simply offer more efficient alternatives to what im hoping to achieve.
For those of you that must know, i am running the latest version of MySql server, MySql Workbench, and Visual Basic 2010 Express on a windows 7 based laptop. I'm writing this program in VB.net.
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Add 2 Table When Using The INSERT Statement In Query Builder?
Feb 13, 2012It seems like the query builder in vb only allow 1 table to use the INSERT statement, so are there any way add more than 1?
View 2 RepliesGet Data From The Event Table And Use The SQL Query Statement?
Aug 31, 2011I have three tables set up in a MySQL database called "event", "status" and "user". (as shown below:
EVENT TABLE (below)
STATUS TABLE (below)
USER TABLE (below)
and when I get data from the event table I use the SQL query statement below to bind the persons first and last names together as one variable called "name" and then bind that name to the respective user_id; and so on. However when I make changes to the event table it doesn't show the changes I've made. I'm certain it has something to do with the way I'm retrieving the data.
SELECT CONCAT(u.lastname, ', ', u.firstname) AS Name
, s.message AS Message
, DATE_FORMAT(e.timestamp,'%b %d %Y - %r') AS DateTime[code].....
Select Query With 'IN' Statement In Data Environment In Vb6?
Jul 8, 2009I want to make a report with a query "Select * from StudMaster where StudID IN ('S0001','S0002','S0003')"For this I created a parameterised command object in data environment and set the query as:Select * from StudMaster where StudID IN ( ? )
Then I called in vb code as:Dataenvironment1.command1 ("'S0001','S0002','S0003'")
Is there anything wrong in it? It is not working..Plz help me out, how can I make it run.
Create A Query With Where Statement, Combobox.selectedvalue.tostring()?
May 5, 2010I am tring to bind a data to listbox with where combobox.selectedvalue. My code is below; I am using data entity in wpf project;
Class Window1
Dim db As New AdvanceEntities
Private Sub Window1_Loaded(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles MyBase.Loaded[code].....
Also I need to create a query with Join In statement. I need to get two table in one query, they have same values in USERID collumn.
Use The Combo Box Value As A Table Name In Access Database Query Statement?
May 1, 2012[Code]...
how can get the name of the table that = to the name of the combobox1 when i select it.
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DB/Reporting :: Updates Statement Works In Query Builder But Not When Running
Mar 2, 2008I have developed an ASP page in Visual web developer that retrieves the data usingan AccessDataSource object. I have the following UPDATE Command:
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Create A LINQ Query Statement That Retrieve Intersecting Data From 3 Datatables
Nov 26, 2010I am trying to create a LINQ query statement that retrieve intersecting data from 3 datatables (dt, dt1, dt2). My first attempt to do so with the following LINQ query statement was successful: [code] However in my design, I would need the LINQ query statement to be dynamically generated, because I want a user to be able to retrieve intersecting data entries from VARIABLE number of datatables. In this case, the first option is not as good as the "INTERSECT" query operator, with which I can just easily connect each SQL query statement with a "INTERSECT" operator. The problem is that my second attempt using the "intersect" operator fails, and after many trials and errors I still can't get it to work. [code]
View 5 RepliesQuery Date Range Statement - Bind An Access Database To A MSChart Control
Jun 10, 2011I am trying to bind an Access database to a MSChart control in VB Net 2008. I have a test database populated with four fields SAMPLE-DateTime, Values-Number, MAX-Number and MIN-Number. I'd like to only display the rows that fall within a specific date range but I'm running into a problem when i try to execute the following command:
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Asp.net - Must Declare Scalar Variable?
Oct 21, 2011I have been debugging my code for a while and looking at posts in other forums, but it seems to be that everyone has a different problem than mine and what works for them will not work for me.My dropdown list is supposed to filter a gridview by choosing all the Companies that are associated to a certain product. The solution I have found online is that most people did not have DataKeyNames set in their gridview. I do have this set, but not to CompanyID. It wouldn't make any sense. So I have no idea what I am supposed to do since this is the only answer I have found.
<asp:DropDownList ID="ddlCompany" runat="server" DataSourceID="dsCompanyFilter"
DataTextField="CompanyName" DataValueField="CompanyID" AppendDataBoundItems="true"
AutoPostBack="true">
[code]....
How To Call Scalar Value Function
Apr 20, 2011I have one scalar value function defined in sql database.It accespts 2 parameters and return an integer.Can anyone please help how to call UDF from vb.net using oledeb?
View 1 RepliesMust Declare Scalar Variable @ID?
Jan 9, 2012Must Declare Scalar Variable @ID?
View 11 RepliesMust Declare Scalar Variable?
May 16, 2012This seems so basic but I've been struggling to find a solution! I have a web page that take user data from aspx textboxes. Upon hitting a button, the click event submits the responses to a SQL table. Seems easy.I'm using VS10, dev express and VB code. I have established my datacontext class using LinqToSql...In a nutshell, the code is as follows...within the click eventNote that "database" was earlier defined as my datacontext sql connection, "Request" tablee
Dim vname As String = AspxTextbox1.Text
database.executecommand("INSERT INTO [Requests] (ContactName) Values (@vname)")
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Must Declare The Scalar Variable?
Apr 6, 2010im having this prob, when deleting a line from my gridview, this error shows out.Must declare the scalar variable "@productid".Well, i dont know whats wrong with the coding. As i have already declared the productid.
<table style="width:100%;">
<tr>
<td class="style24" colspan="2">
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
[code]....
VS 2008 Scalar With SQL Variable?
Jun 10, 2010I've done some research and I'm not sure what to look for or what my problem is.My error is: "Must declare the scalar variable '@client_id'"
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[2005] Must Use Scalar Value = @Username?
Feb 7, 2009I am getting the following screen shot error when I am testing my code.
vb
Private Sub cmdLogin_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdLogin.Click
'get todays date and assign it to a variable
Dim TodaysDate As Date = Now
[code]....
.net - Update Non-scalar Entity Properties In EF 4.0?
Apr 27, 2010At first I was using this as an extension method to update my detached entities...
Public Sub AttachUpdated(ByVal obj As ObjectContext, ByVal objectDetached As EntityObject)
If objectDetached.EntityState = EntityState.Detached Then
Dim original As Object = Nothing
[code]....
Everything has been working great until I had to update non-scalar properties. Correct me if I am wrong but that is because "ApplyCurrentValues" only supports scalars. To get around this I was just saving the FK_ID field instead of the entity object relation. Now I am faced with a many to many relationship so its not that simple. I would like to do something like this...
Dim Resource = RelatedResource.GetByID(item.Value)
Condition.RelatedResources.Add(Resource)
But when I call SaveChanges the added Resources aren't saved. I started to play around with self-tracking entities but it seems they cannot be serialized to ViewState and this is a requirement for me.how to either save my many to many relationships or serialize self-tracking entities?
Must Declare Scalar Variable - Error
Oct 11, 2011I double check the query and it is still throwing the error..
sql = "INSERT INTO " & tbl & " (userName,userPassword,userAccessLevel, "
sql = sql & "userDateCreated,userFirstName,userMiddleName,userLastName, "
sql = sql & "lastUpdateDate,lastUpdateBy) "
sql = sql & "VALUES (@u,@p,@lvl,@dateC,@Fname,@MName,@LName,@lud,@lub)"
Dim p As SqlParameter() = New SqlParameter() _
[Code] .....
Never Used OLEDB Scalar Variable Error
Mar 6, 2012I'm trying to get a connection established for an OLEDB connection, but since I've never used it, I don't really know what I am doing wrong. I managed to get a connection in the web.config file, I think, but now I get the 'must declare scalar variable' error. I thought I declared it, but it. [code]
View 1 RepliesProvide Db Scalar Methods In All Classes?
Mar 5, 2009We build a class (i.e. Server) and create a LOAD method that loads a dataset with all the details of that object.We need all that information sometimes... but what about when we only need one piece of data from that object (i.e. webserviceUrl).Should we build classes with a bunch of scalar methods that get back single pieces of data as opposed to only getting ALL the data and then only taking what we need?It's a waste to get all the data when we dont always need all of it but it also will take longer to write the extra methods..
View 2 RepliesSQL Error Must Declare The Scalar Variable
Mar 28, 2012I have been stuck for a long time on this simple but obtuse message "Must Declare the Scalar Variable"
I have a vb.net and SQL code that inserts data into a simple table. It works OK with sample data, but when I try to use a parameter (insertcommand.Parameters.Add("@ID", SqlDbType.Int, 3).Value = 50) it gives me the error. If I replace the @ID with just a number it works.
Eventually .Value = txtid.text if I can get the parameter to work.
Dim connection As New SqlConnection
Dim connectionString As String =
"Data Source=LAPTOP-PCSQLEXPRESS2008;Initial Catalog=golf;" &
[Code]....
