i have this delete code
My search
Public Sub mnamesearchdata()
'search data
Dim blnfound As Boolean
blnfound = False
[code]....
My Database In case. Having weird issues also were my database will be wiped out. Having 0 record.
[URL]
When I run the following code I get the error "Concurrency violation: the DeleteCommand affected 0 of the expected 1 records.", I know that this happens when the data is changed in between pulling it from the database and sending it back but, the database is not being edited.
View 6 RepliesThis code used to work but for some reason it doesn't anymore. I get the error "Concurrency violation: the DeleteCommand affected 0 of the expected 1 records." I checked to see if the values were in the db and they were, by the way I'm using Access 03. I commented out the try/catch block and got the error when trying to update the ds.
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None of the "answers" that I have been able to find, address the problem. I am using oledb to read and update a MS Access DB in an ASP.NET application.I read the member dataset and fill it using the data adapter.I modify the row of data in the dataset.I then use the data adapter to update the row and get the error shown in the subject.
I am an experienced developer using ado.net on sql server windows application via the data adapter, so am familiar with how this should work.
I have searched everywhere and am hoping that someone here at Microsoft might have the answer.
I keep getting the above error when trying to update a record from a SQL Server DB TableWhat exactly does this Error Message mean?
View 3 RepliesMy client recently got this error but I can't reproduce it on my pc. Any Idea what the problem could be. I have a master/detail scenario. So I have a grandparent/parent relationship, so when I select a product from my product combobox it displays the relevant results from the Result_Header table in my first datagridview.
Then I have a parent/child relationship so that when I select a result_header item from my first datagridview it displays the child records from the Result_detail table. If i'm adding a new Result_Header and then click save, I search for existing tests for the chosen product and insert them as new datarows into the Result_detail table. then I can update the child rows and click the second save button and it saves what I edit. Quite complicated.
Dim data As DataSet
Private dbpath As String = My.Settings.dbpath
Private con As New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;" _
& "Data Source=" & dbpath & ";Persist Security Info=False;")
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I am working on a program whereby insert, update and delete of database is required, i have been able to do so successfully but the above error occurs when i tried to insert a new row of data into the database and tried to edit it and update it to the database. The database platform i used is SQL server 2005 and i am using datagridview to display my data, my primary key is "s/n" which is an auto number, however, whenever after i insert data into the database, the newly added row has the "s/n" column blank shown in the datagridview and after i edited that row and tried to update it, the error occurs.
Imports System.Data
Imports System.Data.SqlClient
Imports System.Threading
Imports System.Text.RegularExpressions
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im using a sqldataadapter, dataset and bindingsource to connect to a table. i retrieve all records from the database and i change the data on a field then update changes to database. when i try to change back to original value i get a Concurrency violation error (concurrency violation: The updatecommand affected 0 of the expected 1). this is the
Try
Me.Validate()
Me.sqlBindingSource.EndEdit()
Dim slqCmdBuilder As New SqlCommandBuilder(sqlAdapter)
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I'm trying to update a Access database. I'm new to this and I've reviewed an Ado tutorial early today. I'm trying to apply what is taught but I'm getting an error message and I can't seem to get passed it.
In my code I have an Add, Update, and Delete process. The Add and Delete processes work just fine. It is only when I go to update the database that I get the following message."Concurrency violation: the UpdateCommand affected 0 of the expected 1 records."
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I've got a simple mdb database set up in Visual Basic Express Edition (winforms) and I'm trying to update data from a datagridview to a database. I've databinded the textboxes to the columns I want in the datagridview and this works great. After some struggling, I've finally managed to have the values updated in every row of the database. But, trying to modify a newly created record throws this error:
"Concurrency violation: the UpdateCommand affected 0 of the expected 1 records"
I mean, it seems as though the error only happens with newly created rows. Because closing the application and reopening it immediatly, I'm allowed to update the values of the cells.
I also noticed that the ID of the row is set to "-1" when I've just created a new row. The other rows don't have a negative number for ID. Could this be the cause? Seems as though the row isn't really updated to the database.
So this is the code for the AddRow button
Dim newRow As MusicDBDataSet.SongsRow
newRow = MusicDBDataSet.Songs.NewSongsRow()
newRow.Name = txtBoxNewName.Text
newRow.Genre = txtBoxNewGenre.Text
newRow.Rhytm = txtBoxNewRhytm.Text
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But thinking about it, the textboxes used to update the values of the newly created row are databinded to the database or tableadapter itself right? Could it be that the UpdateCommand fails because the row hasn't really been created properly yet?
I have created an application which ticks and unticks a routing sequence. But whenever I click on my save button after tickin the required, I get an exception thrown at me stating "Concurrency violation: the UpdateCommand affected 0 of the expected 1 records". My code is as follows:Private Sub OKButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OKButton.Click
'Displaying the rows in the dataGridView.Me.myadapter.SelectCommand.CommandText = "SELECT dbo.WR010130.RTSEQNUM_I, " _& "RTSEQDES_I, SCHEDULESTARTDATE_I, DONECB_I, " _& "CLOSEDBY_I, DATECLOSED_I, TIMECLOSED_I, SCHEDULESTARTDATE_I, WCID_I " _& "FROM dbo.WR010130 JOIN WO010032 ON dbo.WR010130.MANUFACTUREORDER_I = dbo.WO010032.MANUFACTUREORDER_I " _& "WHERE dbo.WR010130.MANUFACTUREORDER_I = '" & MoNoComboBox.Text & "' AND (dbo.WO010032.MANUFACTUREORDERST_I = 3 OR dbo.WO010032.MANUFACTUREORDERST_I = 7)"
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I'm having an issue with a concurrency violation when I save my data(only on one form). All other data forms are working fine. This form has a lot of code, so to isolate the problem I added a new form to the project and dragged the table from my datasource, in detail, to the form. this is the only code in the form,
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When my project starts, it first checks for the existence of certain rows in the database. During testing, I often delete these rows, as they get kind of messed up over time due to all the odd tests I am running. For that reason, if when the project starts, if the records are not there, the program first creates them.The records are pretty static over the lifetime of the project, so they are held in a dataset for ready access from various parts of the program. Therefore, if the records are not in the database, the records are added to the dataset, and the dataset is updated back to the database. This works without any issues.However, one of the easiest actions to take will cause one of these records to change two fields, and a new record will be added. Those are all the changes that are caused by this action. Those changes are then updated to the database...or so I hoped, but when I try that I get an exception stating:[code]I have looked at the datatable that is being updated, and there are, as I expect, two records being changed. One of the records is the new one that is being added, while the second record is the record that was changed. I have noted that the change is, in fact, different from what is in the database, so this really IS an update.
However, I also noted that if I then stop the program and start it again, all is well. This indicated to me that it was actually the routine that created the records that was causing the trouble. Therefore, to test this out, I tried a totally horrible solution. I altered the method that writes to the new records to the database so that after it wrote each record, it would clear the whole dataset and fill it all again. That's obviously a terrible thing to do, but it works. If I write each record, throw out the dataset and re-create it, then I don't get any exceptions when I later try to modify it.This makes no sense to me. What am I doing in that first method that could be putting the Dataset into a state where it fails on any further modifications? I should add that the code that actually pushes the changes to the dataset down to the DB is the same for both methods. In fact, the database is updated in an UpdateDB method that is called from that first method (which creates the initial records if they are missing), as well as being called by the other methods that alter the dataset. I have also confirmed that ANY alterations I want, whether they add, remove, or just alter records, works fine. It is only that one method that creates the initial records that is causing me trouble. Moreover, it is not the actual update of the DB that is doing it, since that same method works fine ever after. Further testing has showed that the issue is row by row. As each initial row is added, it can't be modified by any other code until the dataset has been re-read from the DB. url...
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I have been looking at the ADO tutorial on this site and am trying to apply it to my own DB. When I run the code above I get this error Concurrency violation: the UpdateCommand affected 0 of the expected 1 records.
I'm trying to get the Affected Records but it always give me -1Here is my code:
cmd.CommandText = "SELECT * FROM persons"
Dim lrd As SqlDataReader = cmd.ExecuteReader()
MessageBox.Show(lrd.RecordsAffected)
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My users are getting this error when trying to update the database:
"Concurrency violation: UpdateCommand affected 0 of the expected 1 records"
All the users are doing is clicking a button which updates a record.No two users are updating the same record or even within the same column. They could be updating within the same row but still not the same record.It seems to be happening when the program is open for a little while and they come back and try to update the database through the program. I have read a little bit about this error but none seem to lead to a clear solution.It seems like the database connection is timing out due to inactivity?Here is my update command:
vb.net
Private Sub btnComplete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnComplete.Click
Me.txtComplete.Text = Date.Today[code].....
I am trying to make a simple demo of a DataGridView bound to a database table. I want to add a row, delete a row, and save the table. I used the IDE to do just about everything. It created the BindingSource when I set the datasource of the DataGridView to a table of a DataSource I added to the project.
Now the only code looks like this:
Public Class Form1
Private Sub DataGridView1_CellContentClick(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellContentClick
End Sub
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[Code] .....
I set the AutoIncrementStep to 1 in my Key field in the dataset (the .xsd). I left the Key field visible in the DataGridView and it seems to be adding the correct Key when a row is added. However, I still occasionally get the "concurrency violation" error if I just mess around with these 3 buttons. Any idea why/how to prevent that?
get around the following problem please?I have an Access database which can be accessed by more than one instance of my application (which is) a Form with a DataGridView on it.I populate the DGV with
Form1.Validate()Form1.CHECKLISTBindingSource.EndEdit()Form1.CHECKLISTTableAdapter.Update(Form1.chkDataSet.CHECKLIST) The Access Database can then be updated via the DGV by a button click (which runs the code above (to copy across the latest copy of the DB) and then runs the code below to copy your changes to the DB)
Form1.CHECKLISTTableAdapter.Fill(Form1.chkDataSet.CHECKLIST)
Form1.DataGridView4.DataSource = Form1.CHECKLISTBindingSource
Form1.DataGridView4.Refresh()
The Access table is basicaly a 'Time' Column and a 'Name' Column.
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A concurrency violation error? It happens on this statement:
CODE:
It thinks I'm using a key value of 1 when the actual value is really 1218. I'm using a command builder. The attachments show the value of the key value and the value of the update text values. By the way, I can insert data but not update it.
I'm having some trouble updating changes I made to a datatable via a dataadapter. I am getting "Concurrency violation: the UpdateCommand affected 0 of 10 rows"
'Get data
Dim Docs_DistributedTable As New DataTable("Docs_Distributed")
Dim sql = "SELECT DISTINCT CompanyID, SortKey, OutputFileID, SequenceNo, DeliveredDate,
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the problem here happends every time i tried to change a record that's been allready saved.Private Sub PropuestasBindingNavigatorSaveItem_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles PropuestasBindingNavigatorSaveItem.Click
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I have a single user app that I wrote and have been using for more than a year that uses an Access 2003 database. Today, out of the blue, I started getting a DB concurrency violation whenever I tried to update one particular table in the database. After trying to troubleshoot what the problem might be, I just deleted that table and recreated it and the problem went away.
View 2 RepliesI have a DataGridView binded to a DataAdapter to manage the details of an invoice(products). The Table fields are:
ID_Invoice int (PK)
ID_Product int (PK)
Quantity numeric(18,2)
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I am writing a program that makes use of SQL databases using MSSQL Express 2008. I've just written code that updates data in the DB, but I noticed when I update an entry in one instance of the program, and then try to update the same entry in a second instance of the program it goes through. What I want is concurrency so if the entry is different from the original, updating is not allowed.
Here is the code I use to update entries
VB that calls the class and checks for errors...
Try
If contactIsValid() Then
Dim getresults As New groupfilladd
If getresults.updatecontact(myParent.itemfound + 1, fnameTxBx.Text, lnameTxBx.Text, _
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I have exactly same problem as guy at [URL] . Quote: I'm using multithread in my application. in each thread, launch a form which has a webbrowser. each browser is controlled by another thread to test some sites. however, sometimes, it has some access violation exception. these exceptions are not beause of cross thread issue since all processing for the browser are using delegate. And the problem is: I can not catch the access violation exception.
View 3 Replieswin7 64bit, VB express 2010.
I'm working on a project. The main form is a MDI parent, it host a control form. on control form, there is a button. when click it, it will start, say 10, threads.
each thread will open a standard alone form (not mdi). on each form, it has a web browser control. when the form opened, it will start a new thread which makes the web browser control load a url, then depends on the links in that url, it will load another url, and loop for some times. then, the thread stops, and the form closes.
for some reasons, I got this weird exception:
AccessViolationException was unhandled by user code. Attempted to read or write protected memory. This is often an indication that other memory is corrupted.
1) the exception happens randomly, and not always happen. when it happens, it is always some code related with the web browser, i.e.
Not (MDIWebBrowser.ReadyState = WebBrowserReadyState.Complete)
or
MDIWebBrowser.Document.Body.InnerText()
2) I put a try catch in, but, it can not catch this exception. If I just close the exception dialog, sometimes, it keeps running without problems. sometimes, it just pauses the webbrowser control.
so, I did some research. it seems many people had the exact same problem. and it seems the best choice is:
[URL]
I checked all solutions suggested, even manually change the DEP, by using "bcdedit.exe /set {current} nx AlwaysOff"
but, the exception still pops up.
[URL]I'm making a bot to submit a form multiple times. I want to add "public int count" and "public int max" to limit and count how many entries I've had.I can't find out where to put it though, I know in the class but where? When I put it somewhere it says end of statement!
View 1 RepliesI have a ListView that lists features of a product on my website. I included an image button that is supposed to delete the specific feature, but my DeleteCommand won't do it. I have looked in my database, and the record is still there. Is there some code I need to add to the CodeBehind file to get this to work?
<!-- Features -->
<asp:TabPanel id="tab1" class="infoHeader" runat="server" HeaderText="Features" DataKeyNames="MarketingID">
<HeaderTemplate>Features</HeaderTemplate>
<ContentTemplate>
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VS 2010 Beta 1 offers the user the opportunity to change .NET versions.I compiled a solution then built same in .NET 4.0 Then compiled/(re)built in 3.5. The output info showed 3.5 but on an XP Pro (up to date .NET 3.5 machine) the Setup install produces an error message:"You need to obtain NET 4.0. Do you wish to get it now?"
View 14 Repliesi just wrote a simple java script function which will return true or false, even when the function returns false my server side button click event was firing. this is not happening regularly. i am using vs 2010 and ie 8 and vb.net 3.5, this is not happening all the time [Code]
View 1 Replies