Sql - Perform An Inline Select Statement In A LINQ Statement?

Jun 24, 2011

I have the following SQL:

[Code]...

I want to put it (the select count statement) in this LINQ statement so I can get the sales count in my linq statement: Dim TheLeads = (From L In DB.Leads Where L.IsDeleted = False Select L).ToList() Is this possible to do in LINQ?

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Use If Statement During Select From Linq To Datasets?

Dec 14, 2009

I have this LINQ statement [code]...

Is there any way that I can use if/iif within select ?

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Dynamic Variables In Linq Select Statement?

Nov 23, 2009

I have a listbox that is dynamically filled by certain values depending on what table has been selected from another list box. Once a value is selected, it is being graphed vs a date & time range. With my ignorance of linq: depending on what value is selected, the linq to sql statement I need to create to grab data from my database is different as I can't use an index on an anonymous type.

result = From t In db.APS _
Where t.DateTime >= startDate And _
t.DateTime <= finishDate And t.Weight = weight _
Select t.DateTime, t.TotalConcentration

t.TotalConcentration should be selected if my listbox value is "Total Concentration", but if it's something else, like "Temperature" or "Flow Rate" (connected to appropreate database columns) - this method obviously isn't going to work. I need to be able to dynamically select a specific column from the anonymous type list, or use some other method I'm unaware of to do this.

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ElseIf Statement Into A Select Case Statement?

Jun 23, 2010

A co-worker wants to convert the following IfThenElseIf statement into a Select Case statement.
Explain why this is not possible.

If temperature = 100 Then
X = 0
ElseIf population > 1000 Then
X = 1
ElseIf rate < .1 Then
X = -1
End If

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Aug 13, 2010

I am trying to do an inline IF statement inside a asp:Repeater control to add a class to the first item, but I can't quite seem to figure it out. Basically the code I have right now that is not working but should give an idea of what I'm "trying" to do looks like this.

<asp:Repeater ID="rptrTabRepeater" runat="server">
<ItemTemplate>
<div class="tab <%= If Container.ItemIndex = 0 Then %>highlight<% End If%>">
'Other stuff here

[code]....

I have tried using the OnItemDataBound event but the delegate interface cannot return a value. If I'm going to do anything from a code-behind function really it would just need to be an "echo" kind of function which I wasn't quite sure how to get the item index in a code behind function.

EDIT: The compile error I am getting is:

Compiler Error Message: BC30201: Expression expected.

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Jan 17, 2012

I have an existing stored procedure that need to be used now as inline SQL statement in my VB console application. How do I change it?

Stored Procedure:
:Setvar CUSTOMDBNAME "My_DB"
USE [$(CUSTOMDBNAME)]
GO

[Code]..

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Stop A Loop Statement In VB And Not Perform Display Changes Until After Call Procedure Is Valid And Complete?

Apr 19, 2010

I am having problem with the coding of this (endless loop) and formatting of summary boxes before tests are complete that should not happen. (the overall goals is to have a separate validation procedure that does not calculate or dat displays are not performed until after call function is complete and valid.  The validation that takes place are that two boxes are filled in - one is text and the other is a numeric value. (using vb 2008)

[Code]...

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Jun 24, 2011

Ok 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}

[Code]...

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Oct 7, 2009

I am going to be performing an XSLT transformation, transforming XML to an HTML table. It's tabular data, so that's why I'm not using div's.

[Code]...

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Aug 13, 2009

I'm relatively new with LINQ, but I'm going to be getting into it a lot more. Is the following a practical application of LINQ, or is there a better way to do something like this? [code] I was thinking if I could get the property name somehow as an object I could just do one LINQ statement,

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LINQ Where Statement In Collection?

Mar 28, 2012

I have a Customer object which has a collection of ContactNumbers. Is it possible with LINQ to get a list of Customers where one of the contact numbers = '123'?

Public Class Customer
Public Overridable Property ContactNumbers As List(Of ContactNumber)
End Class

[Code].....

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Select Statement In .NET?

Jul 2, 2010

with the following code which gets stucked on the line of reader = Cmd.ExecuteReader(). It says the SqlException was unhandled (An expression of non-boolean type specified in a context where a condition is expected, near '7/2/2010'.)

[Code]...

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SQL Select And Where Statement In VB

Jan 8, 2010

I have successfuly connected to a database and have create a select statement (with access) which works most of the time except when im trying to perform a where statement with a date:

strEmployeeDepartmentLocation = Application.StartupPath
con.ConnectionString = "PROVIDER=Microsoft.Jet.OLEDB.4.0;Data Source = " & strEmployeeDepartmentLocation & "swineFlu.mdb"
strSQLSelectQuery2 = "SELECT NumberOfCase FROM table1 WHERE Date = 21/04/2009;"

i dont no if im writing it in the wrong format or what but it dont seem to bring back any data

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SQL Statement Doesn't Work - INSERT Statement Works Fine In The Form Load But Not In The Button Click Event?

Oct 14, 2009

See

Public Class Form1
Dim sql As String
Dim conn As New OleDb.OleDbConnection
Dim da As New OleDb.OleDbDataAdapter

[CODE]...

The problem, The INSERT statement works fine in the form load but not in the button click event?

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Convert The Following VB Code To A LINQ Statement?

Oct 8, 2009

I only want to return a certain number of rows into the DataTable via LINQ's Take or use it on the Rows property, but I am not sure how or where to do it: Here is the current code:

Dim dt As DataTable = GetDataTable("sp", params)
For Each dr As DataRow In dt.Rows
Dim o As New OR()

[code].....

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Getting Result Of Linq Statement Out Of A Function?

Jun 16, 2011

I have something that I want to do and what looks very simple, but I cannot get it to work. I want to build a function that gets as input a xdocument and some other strings. It should have a return that contains a filtered part of the xdocument in a way that I can use it as input for a new Linq function. This is what I mean:

Private Function fncGetFilteredDecendantsOfNode(ByVal xdocDoc As XDocument, _

[Code]...

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How To Turn Query Into A LINQ Statement

Sep 30, 2009

How can I turn the following query into a LINQ statement? [code]

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Jul 15, 2010

I have the following code:[code]When I run it, looking at the debugger everything looks okay but when I check the database table it is supposed to be inserting into - the column values (for occupantnum) haven't changed - they are all still null! Not sure if this is related, but note that I've now updated j to explicitly be an integer. I noticed while debugging that wResident.occupantnum was appearing as Type "Integer?" - but this doesn't seem to have made any difference - when I rerun it it still says Type "Integer?"

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May 18, 2012

Dim gg = From gs In AllData_TableList Order By gs.Biology Descending, gs.ChemistryDescending, gs.English Descending, gs.Frensh DescendingAll I need is to make this Statement order Dynamically like this

Dim Variable1 as string=Biology
Dim Variable2 as string=Chemistry
Dim Variable3 as string=English

[code].....

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Tell If A LINQ To SQL Query Is Translated To A SQL Statement Or Not?

Oct 15, 2010

We 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?

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Oct 28, 2009

I'm just getting my feet wet with LINQ but am struggling to convert this SQL statement to LINQ.

Dim SQLString As String = "SELECT MESSAGE_ID FROM " & Schema & _
".PPM_TRANSFER_EMAIL WHERE TO_CHAR(IMPORTED_DATE,'YYYY/MM/DD') <= '" & _
DeletionDate.ToString("yyyy/MM/dd") & "' AND IMPORTED = 'Y' AND FILE_NAME LIKE '" & _
mb & "%'"

I have a Dataset that already contains all the data from the PPM_TRANSFER_EMAIL table so it seems silly to query the database again when I can use LINQ to query the dataset.

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If <expression> Then <statement [:statement]> Else [statements] In Concrete Form?

Jan 1, 2010

I was convinced that If <expression> Then <statement [:statement]> Else [statements] in concrete form of If a = b Then SayHello() Else SayBye() End has sense. I read article on msdn on If-then-else, but I forgot why I was reading, so I concluded, that snippet above means this

If a = b Then HelloIsSaid : IsNotEnded Else ByeIsSaid : IsEnded But I have tested it now, and I see, that Else without statement is nothing more than decoration. It would be pretty good if it had function I described. Do you think its good request? Or do you know any circumstance where this Else has some function?

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Making A Next Statement Into A Loop Statement In Visual Basic?

Jun 8, 2009

y friend and I are re-learning Visual Basic, and we are stumped on this bit of code.

For intAsterisks As Integer = 0 To intLine - 1
lblAsterisks.Text = lblAsterisks.Text + "*"
Next

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Apr 9, 2012

I have a datatable and I would like to get the MAX number from this table where Term Number (first Column) is a certain value. If my datatable is declared as dtMyTable, I'm assuming I need to use dtMyTable.Select(), but I'm not sure if this is the best way.

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DB/Reporting :: Using Tow Select In Same Statement?

Dec 29, 2008

I'm using Vb2005 and Db MS access Is it possible to use tow Select in same sql Statement like this example:

Code:
"Select....Select......."

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Display Id And Name Via Sql Select Statement?

Dec 29, 2011

I have 2 dropdown lists, 1 label & 1 textbox.on selection of 'product categories' @ 1st ddl, 2nd ddl displays all product categories.question is, how may i display the product category id @ the label, and name @ the textbox, on load/selection of 2nd ddl?[code]....

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Select Statement By Row Numbers?

Sep 10, 2010

If I have a datatable with 5000 rows for example can I do a select statement by row numbers. like paging throught it so I don't have to display all 5000 in the datagrid..  i want to go forward and back by 100 rows

vb.net 2008 (vs 2008)

For example:

dgInbox.DataSource = dsInbox.Tables("Inbox").select(between rows 200 and 300)

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Sep 7, 2011

I have a sql statement 

 SQL = "select * from Candidate where test_date = " & TextBox2.Text

I am getting error in the line myDataAdapter.Fill(myDataSet)

Conversion failed when converting the varchar value '03/15/11' to data type int

In my sql server test_date column data type is varchar.

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SELECT Statement For MS Access DB?

May 23, 2012

I am tryin to access a 2003 Microsoft Access Database using VB in an OleDb format.  The database file name is Billings.mdb and there are 3 tables in the file the one I am trying to access is tbl Clients.  When debugging the program I continue to get an Unhandled error point to the FROM part of the SELECT statement.  It continues to occur regardless of my attempts to vary the input.

In the program my connection statement is as follows:

Dim connectionString As String = "Provider = Microsoft.Jet.OleDb.4.0; Data Source = C:Documents and SettingsTrialsBillings.mdb"

The Select statement is as follows:

Dim selectStatement As String = "SELECT ID,  ..., PB " & "FROM tbl_Clients " & "WHERE ID = ?sngID"

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SQL Select Statement Error

Jul 21, 2009

Basically, I have the following sql select statement in vb.net.[code]...

From the above statement, I would like retrieve several data and the count of Traceid from trn_Invt_Details where the traceid in trn_Invt_Details match with traceid in trn_Invt. By the way, it will also based on the criteria where the field of ErrorType in Trn_Invt_Details is Null or contain empty string. Then it will retrieve out the count of traceid.Finally, all the results will save to dataset in vb.net

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SQL SELECT Statement Mismatch?

Aug 19, 2010

What's wrong with this ?

ERROR: Type mismatch in expression.
conectare_db()
data_table = New DataTable[code].....

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Jun 3, 2011

I just replaced a different segment of code with the select case statement and it works fine. However I don't understand what the dim is for after you do "Select case [variable name here]"

I currently just dimmed a value as nothing. I didn't specify any data type for my variable I'm using for this case statement. But it works.[code]...

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Feb 22, 2012

I am using vb.net 2005. I am trying to select data from a table where the field [hoteldate] is 2 days from now. The field's format is MM/dd/YYYY and when I use the Where clause :WHERE HOTELDATE = DATEADD([DAY], 2, GETDATE()) it returns nothing. I am assuming it's because the getdate() function returns something like 2012-24-02 T blah blah. How do I convert so I can get a match? I've tried several things including converting do a

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Variable In Select Statement?

Aug 16, 2011

I have a simple vb script which extracts some data from our accounting software to a text file. It works fine when I do not use a variable in my select statment as follows:

xselect = "SELECT SourceJournal,JournalRegisterNo, PostingDate, PostingComment,UserCreatedKey
FROM GL_DetailPosting

[Code].....

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Feb 28, 2011

I have a select statement, this select statement comes back on a slqadapter, would l would like to do is like
textbox1.text=sqladapter.(columane1)
textbox2.text=sqladapter.(columane2)
and so forth instead of filling a datagrid.

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VS 2008 SELECT Statement Possible?

Jan 26, 2011

I'm using the following statement to search an Excel file. It specifies Sheet1$ and I would like to do a search that included another 12 sheets. Is there syntax that allows a search across several sheets?

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Nov 25, 2011

I was using an If block to see if a line in a file contained a specific string. But I need to look for many different string and do different things based on each. So I don't want a million nested If blocks. So I decided to use a Select statement. But, I can't figure out how to use .Contains with it. If I do .ToLower.Contains, like I did in the If block, it stops me.

VB.NET
For Each _line In lineList            Select Case _line.ToLower 

[code].....

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Nov 27, 2010

OK So I know WHY I am having the error I am getting. I don't know HOW to fix it. Basically, if the user doesn't have a certain permission, I need to join another table. But .NET is so picky I can't just make two different queries in an IF statement and then use it outside of the if statement. I can think of some ugly work arounds for this, but I would rather not. I am fairly new to .NET I know just enough to be dangerous.

[Code]...

because of this: Dim l As IEnumerable(Of Company) its not just IEnumerable of a Company, its got the source in it. I have to explicitly select source to use it in my datagrid. Can I make Dim l something that will make it stop complaining?

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Execute A LINQ Statement Without Assigning It To A Variable?

Apr 15, 2011

I have the following function

Public Function GetPositionBySchoolID(ByVal SchoolID As Integer) As CPAPositionsDataTable
Dim positions As New CPAPositionsDataTable

[Code]....

And I was wondering if there is any way to cut out assigning the LINQ result to tmp and just work with the result directly, i.e.

Public Function GetPositionBySchoolID(ByVal SchoolID As Integer) As CPAPositionsDataTable
Dim positions As New CPAPositionsDataTable

[Code].....

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Sep 21, 2010

If txtSearchString.Text.Trim <> "" Then
Dim searchString As String = txtSearchString.Text.Trim
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[CODE]..............

I am getting this error: error BC30205: End of statement expected.

FilterPurchaseOrders() function returns a datatable.

Whats wrong with the above code?

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Jun 23, 2010

I thought this would have been quite common but can't find anything on this. I'm trying to query columns that have spaces immbedded within them. For the life of me I don't see a way of selecting them when I'm trying to assign them to an alias when creating an anonymous type result. [code]...

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Aug 19, 2010

i want to use a if, then statement in a where clause in linq to sql. Is this possible? I'm trying to achieve the following:

[Code]...

I'm trying to only add the And If if intLink_pk > -1. If it = -1, then i don't want the and clause at all. Is this posssible within the linq to sql itself?I understand i can write 2 entirely different selects, but if I can't get this done, I may have to write about 50 of them as I want to use multiple Ands if certain conditions are met on the form, such as chk boxes etc.

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Jul 8, 2009

I know i must use Stored Procedures as much as Possible, but i would like to know the following.

A: Can i get a SQL Injection attack from a SELECT statement such as (Select * from MyTable) ?

B: Also, can i get a SQL Injection attack when I use the SQLDataSource in ASP.NET?

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Fill The Variable In SELECT Statement?

Mar 30, 2009

How do I fill the variable in my SELECT statement?

Private Sub TabPage2_Enter(ByVal sender As Object, ByVal e As System.EventArgs) Handles TabPage2.Enter
strTenantPin = tbxTenInfo_Pin.Text

[Code].....

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Dec 17, 2011

I've got the following that has got multiple values of a particular variable and I don't want to stack up to a lot of IF ELSE statements to handle them, so I'd be grateful if some one could very kindly modify the code by using the SELECT CASE statement. Also, I'd like dgMarksEntry.Item(7, i).Value and dgMarksEntry.Item(8, i).Value to handle RANK and COUNT the number of items entered respectively. [Code]

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