Work With Multiple Updates By Linq To Sql?
Sep 11, 2010
it is possible to do a multiple records editing by linqtosql method in one click event?What I've been trying to do is to edit all the names in the table which are having the same account number.
Private Sub Button2_Click(------------) Handles Button2.Click
Dim accnt As String
accnt = Textbox1.Text
Dim db As New memrecDataContext()
[code]....
Why is it these codes could only edit records in one datarow?Can you debug the codes to edit all records which are having the same account number after it is being query?
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Oct 19, 2009
I would like to ask if it is possible to do a multiple records editing by linqtosql method in one click event? What I've been trying to do is to edit all the names in the table which are having the same account number. I was able to edit but only one name has been edited and the rest are not
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Private Sub Button2_Click(------------) Handles Button2.Click
Dim accnt As String
accnt = Textbox1.Text
[Code]....
Why is it these codes could only edit records in one datarow? Can you debug the codes to edit all records which are having the same account number after it is being query?if that is possible for you.
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May 29, 2012
I found that when group by multiple values does not work well with VB.NET, but it works well with C# ,here are my code, is there something wrong with my VB.NET Code? Here is my VB.NET code:
[Code]...
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Jul 9, 2009
I have a program that uses sql for the database. The issue im having is when two users attempt to update the same record then the update from second user overwrites the record from the first user. I believe this problem comes from the the way i attempt to preserve existing text in the fields.
My thought on whats going on is: If the form has fields A and B. Both users start with a blank form. User 1 adds a record with an entry in field A. When user 2 goes to update the record with an entry in form B, the program overwrites user 1s field A entry with the blank field A from user 2.
Is there a way to force it to grab the most recent data before it tries to add/update? I thought about resetting the digit combo box to the same digit which would trigger the change event for that field. but the issue with that is it would also wipe out the current entries on the form.
Below is the change event for the digit combobox, the main submit procedure, and the subprocedure for one of the days.
[code]
Private Sub cboDigit_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cboDigit.SelectedIndexChanged, cboOffice.SelectedIndexChanged, dtEndDate.ValueChanged, dtStartDate.ValueChanged
[Code].....
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May 9, 2009
In grid there r checkboxes for selecting the records to be updated as soon as checkbox is checked textboxes changes to edit mode. when data is modified and update button is clicked updation should be done to the database.But when update button is clicked its not working.when i checked through breakpoints i m not getting the value for the variable strID.
Protected Sub btnupdate_Click( ByVal sender As Object , ByVal e As System.EventArgs) Handles btnupdate.Click
Dim strSql As New StringBuilder( String .Empty)
Dim cmdup As New SqlCommand
For i As Integer = 0 To GridView1.Rows.Count - 1
[code].....
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May 17, 2011
Since ADO.Net uses a 'disconnected' model where the data available to a single program is just a copy of what is in the database, what is the normal way to handle multiple programs needing to update the same table in a database? The problem I see is that a program can't update unless his copy of the data is the most up-to-date. Are we supposed to read before updating and hope that the update occurs before someone else changes the data?
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May 31, 2010
I'm using a SQL database and I'm writing a VB.NET client application. This application is used on multiple computers at the same time. If one of the clients makes an update to the database I would like to have the other clients to be aware of the update.
Has ony one already done this before?
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Nov 22, 2009
I'm struggling with getting Linq To NHibernate to work.I have referenced NHibernate, NHibernate.Linq and NHibernate.ByteCode.Castle . Also I have all other dependencies in the same folder.
Code / Error message:
Public Function GetProjectsByName(ByVal ProjectName As String) As List(Of Project)
Return (From x In _session.Linq(Of Project)() Where x.Name.Equals(Project))
End Function[code]....
... tells me that the LINQ extensions aren't loaded. Using NHibernate.Linq seems to be made in a way that it's incredibly easy to use, hence there are no tutorials on how to set it up. (Or at least I couldn't find any).
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Dec 7, 2011
I am learning MVC3 and transitioning to VB.NET from C# at the same time (Fun, I know). I am running through the MvcMusicStore sample for learning MVC3. All the samples are in C# so I am converting them to VB. I came across one piece of code that I was unable to directly convert and had to change slightly to get it to work.
why one way works and the other doesn't.
This does not work:
Dim albums = New List(Of Album)() From { _
New Album() With { _
.Title = "A Copland Celebration, Vol. I", _
[Code].....
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Apr 4, 2009
linq querying various nested tables in a dataset? I can't find something like that on the net.
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Jul 18, 2011
I've problems to detect if there are new rows in a DataTable Email_Total that is yet not imported into ContactDetail.
Dim srcUnique = From row In src.Email_Total
Select row.ticket_id, row.interaction, row.modified_time
Dim destUnique = From row In dest.ContactDetail
[Code].....
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Aug 8, 2011
Using VB.net and the following LINQ statement. I suspect the "Order by" does not work with Concat(). I want to list the current item the user has and then list more available items in asending order. So first i select the current item from the db and then select the next available items in order. LINQ is ignoring the order by statement and sorting by the PK (which is itemID) I examined the list immediately after executing the statement. When I break up the statement and do them separately they work as predicted.
(From items In myDatabase.ItemAssignments _
Where items.BuildingID = buildingID _
And items.ResidentID = ResidentID _
[Code].....
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Mar 15, 2011
I face a problem that if i make a datattype in sql server of Integer and then use it in linq to sql query it give error of "specific cast not valid" and when i change datatype into varchar the linq to sql query work fine one more thing how to use linq to sql query to make crystal report?
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Dec 13, 2011
I am looking for the code to consolidate multiple .xls sheets from within multiple work books in a file all containing the same format of information. Each sheet needs to be coppied to a new sheet within a single work book.
Once in a single sheet I need to then copy data from a range of fields into one consolidated sheet.
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Apr 29, 2010
i'm having troubles with a linq-to-sql statement and getting a left outer join to work. here is a sample of two tables i'm trying to join and my code that i've wrote.
Table1 Table2
f1 f2 f3 f4 fID f1 f2 f3 f4
val1 val2 val3 val4 1 val1 val2 val3 val4
[code]....
Instead I'm returning ALL values from table 1. I need to return all values from the left outer join where tbl2.fID is null.
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Sep 5, 2010
I have a datagridview which is bound to a local databse table through a Linq to SQL class.
Everything works as I would expect, when the application runs, up to a point.
If, in the datagridview tasks pane I enable Adding, Editing and Deleting all work as expected.
If I disable Adding & Deleting, leaving Editing enabled, Editing works as expected.
If I disable Deleting & Editing, but leave Adding enabled, Adding does not work, despite the row for new records being displayed. I can move around the row but not enter data.
I suspect somehow its the datasource as opposed to the datagridview that is the cause of my problem but as I say, I can add rows if the Enable Editing option is selected.
Changing the relevant properties programatically makes no difference.
I've been searching for the reason for a couple of days without success.
I have a workaround, by leaving Enable Editing set and programatically setting each row during the RowPostPaint event to be readonly except the row for new records. I would just like to understand what is going on.
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Oct 29, 2010
I have a linq union statement that has been giving me some trouble and I can't see where the issue is.The error is....All queries combined using a UNION, INTERSECT or EXCEPT operator must have an equal number of expressions in their target lists.
I know the error means that I am selecting different amounts of elements in one of the linq statements, but I've examined this query extensively and I haven't been able to see that as the issue.
[Code]...
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Mar 4, 2012
I am trying to pass several search parameters to an LINQ expression to retrieve all entries that contain one of the search items.
Example:
Dim query = From p In db.BEW_PROFIL
For Each searchItem As String In searchItems
[code].....
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Jul 7, 2009
I just completed building an application that reads and writes to a MS Access database located on a network drive. It works great on the computer that I created it on, but when I try to run it on another computer it fails to initialize. I'm not sure if there's a setting in the database I need to change,
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Aug 10, 2011
I've read a lot of different questions on SO about multithreaded applications and how to split work up between them, but none really seem to fit what I need for this. Here's how my program currently basically works:
Module Module1
'string X declared out here
Sub Main()
[Code]....
This is only a rough outline of what actually happens in my code by the way.
My problem being that if multiple threads start running Main2(), they're dealing with the same X value as in the other threads. The loop inside of main2 executes multiple times per millisecond, so I can't just stagger the loops. There is often duplication of work done.
How can I properly divide up the work so that the two threads running simultaneously never have the same work to run?
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Feb 2, 2011
I had the idea of making a program that would take a list of URLs, display each one, and then let me save the web pages as they came up. So I wrote the following few lines of code. The interesting thing is that they don't work: (vb express 2010)
Imports
System.IO
Public
[code]....
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Nov 1, 2011
I have a class that is a downloader (I didnt make it). You create an instance of it like so:
Dim _Down As New WebFileDownloader_Down.DownloadFileWithProgress(URL, Location)URL and Location are replaced by strings. This all works fine. But when I try to download multiple files, it doesn't work, I just add this bit for another file to be downloaded:
[Code]...
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Jun 2, 2009
So I pulled out my SQL book and I think I am doing this right but VS don't seem to like it. Here is what I got:
[Code]...
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Jul 8, 2010
How would I perform this SQL query
Select Distinct s.*
from #ScopeIDs x
Join Scopes s on s.ScopeID=x.ScopeID or x.ScopeID is null
in LINQ to SQL? (This query would return all Scopes whose ScopeID is present in #ScopeIDs, unless one of the entries in #ScopeIDs is null, in which case it returns all Scopes).
A "literal" translation doesn't work, since LINQ doesn't support joining with multiple conditions - code along these lines ...
From x in ScopeIDs
Join s in Scopes on s.ScopeID equals x.ScopeID or x.ScopeID equals nothing
Distinct Select s
... doesn't compile.
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Dec 6, 2011
I have a list of attachments that I need to group by clientCLID and EmailAddress. From this grouped list I only need a list of clientCLIDs. After fiddling for a while I've managed to get it to work as follows:
[Code]...
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Jun 10, 2011
I spent a lot of time on this problem. I am able to do simple Group By LINQ queries (on one property) but for multiple fields I'm a little stuck... Here is a LINQPad sample of what I want to do :
dim lFinal={new with {.Year=2010, .Month=6, .Value1=0, .Value2=0},
new with {.Year=2010, .Month=6, .Value1=2, .Value2=1},
new with {.Year=2010, .Month=7, .Value1=3, .Value2=4},
[Code]....
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Mar 20, 2011
in my prev question i was suggested with LINQ solution. It was great and simple. I tried to solve next similar but a bit diff problem with similar approach but i failed.
how can i make the below code better
For Each Item As ListViewItem In RoomsListView.Items
For Each Item1 As Room In myBookedRooms
If Item1.UIN = Item.SubItems(1).Text Then
[Code]....
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Apr 3, 2012
I am currently making a game with multiple levels when you complete one level the form hides and shows the form for the next level. But the keydown event doesnt work on the second level. How can I make it work?
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May 4, 2012
I will know how do I work with the opened excel instance, when I use multiple userforms. I have on my form1_load open a excel file. Then I observed that on my next userform, was unable to write to that file again. Project have no instance of APP.workbook.
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May 11, 2012
I'm using Entity Framework code first and pulling some data back from our database. In the table I'm accessing is 13 columns that store the number of a items a customer purchased per week for the last 13 weeks as a char field. I have no control over how this data is stored. I need to total the 13 weeks results together to get a combined total, so take week1 + week2 + week3.... = Total Items Purchased over 13 weeks.In SQL I'd just Cast the char to an Integer and add the values together. But I'm struggling finding a solution to do this in linq.
I tried
(From c in Table
Select New With {.Usage = (Convert.ToInt32(c.week1) +
[code]......
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