Make The Dataset Know The New Identity Of The Row That Is Saved To The Database?
Dec 25, 2009
I have a datagridview with contacts on a form with clients. The underlying table for contacts has a field for Contactnumber. This is a identity column so its new number is generated by SQL Server.
I add a row and when I move to the next record on the form, the form �nd the information in the datagrid is saved to the database. So far, so good. The problem is: when I move back and try to delete that newly made row I get an error about concurrency.
It's logical actually, the record is saved, but the dataset of the datagrid doesn't yet know what the new contactnumber is. Apparently it's not information that it gets back automatically from SQL Server.
How can I make the dataset know the new identity of the row that is saved to the database? I use a simple da.Update(dsVerwijderingen, Tabelnaam) to save the changes to the database.
I am using ADO.NET Datasets in my VB Applications. I have a typed dataset with one Parent table and many child tables. I want to generate Identity Key when I insert data into Parent Table and then update the data in all child tables with the Same key (As Foregin key).At last, I want to update the dataset in Database(SQL Server08).Well, the above thing can be possible by first inserting Parent Table in Database directly, get the Identity column and than use to for Child tables.
I have a control that has multiple tableadapters used to show various information.My delima is that I dont want to update all of them if the data for them was never modifed.Is it possible to check all bindingsources to see if they have any changes and force the ones that have modifed rows to update?
want to update values in an xml file. When users select the xml file, the form binds controls to a dataset. After updating some/all values, the changes are saved. It works for every field except for a calculated value.
I have a dataset (WW1Dataset) with one data table(WW1).(database used in an access database) I'm trying to filter the dataset e.g a user wants to filter by a chosen surname (SurnameTextBox.text) so the datset is filtered to display only those records wherethe surname column in the dataset matches SurnameTextBox.text.
I have been searching the Forums for a solution to my problem, but I can't find anything that relates to my specific situation. All of the postings regarding not being able to save changes to a database have had to do with a datagridview. On forms that I do have a datagridview, my changes are saved.But I have a form with textboxes, comboboxes, and pictureboxes bound to a bindingsource,
Private Sub Back_Button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Back_Button.Click Try
Using VB 2008 Express, I've constructed a simple database type app for saving contacts. The table data I save at design time is always saved correctly but data entered at run time seems to get saved even after closing the app and VB. However, after restarting the computer, the newly entered data is usually gone. Why would this be? I've seen a few video tutorials on creating simple database apps and did everything they did and am getting the same problem. I thought it was a configuration problem so I actually re-installed Windows and VB 2008 Express (as well as 2010 Beta 2). I have noticed that in the database explorer, the .mdf file has a red x to the bottom right of the yellow database icon and when I click the + it seems to turn into a black plug. Is this normal?
so i added a service based database in my visual basic project. At this time the project only exists of logging in or registering, after which you'll log in.now all my SQL seems to be correct and working, the code is good, but when i register new user, it doesn't get stored in the database. but it does get stored...
i know sounds weird right, well what i mean is that apparently the data is getting stored somewhere because i check whether or not the username exists already. if it does i get a message box. Now the weird thing is that between builds and runs it remembers all the users i registered, but when i close the program and later re-open it, all the data is gone...
i used parameters to insert the date, everything from code below:
Private Sub btnLogin_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLogin.Click
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My page have a text box where TextMode="MultiLine"......see below
Now when I save this text in my database of course it does not save it with any HTML tags, and thus when i read that value from the database it comes back as 1 line such as....
But I want it to be dispayed just like the user typed it. Is there no out of box control that will do this for me rather than me using Ajax or jQuery?
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No matter what I've done, I can't make my application window the size and position saved in the registry. Below is the code at the end of my Form1_Load: [code]
am currently having a problem saving any changes i make in my form here is my codes for each button: -Private Sub btnUpdateExistingRecord_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnUpdateExistingRecord.Click 'This code makes sure that all fields in the members table are updated when the button is pressed. This is needed so 'the changes in the Members table are saved currectly in the database.
Dim CommandBuilder As New OleDb.OleDbCommandBuilder(DataAdapte DataSet.Tables("Members").Rows(Include).Item(0) = txtMemberID.Text DataSet.Tables("Members").Rows(Include).Item(1) = txtFirstName.Text[code]......
I'm trying to access a database which is presently saved in .cds format (which I believe is a TClientDataSet) from within my programme written in VB.Net. The reason being, is that the programme I am writing uses the same database as another programme. Both programmes will never being running at the same time, and it is a read-only operation so I could potentially duplicate the database and convert the database to an SQL-compatible format, but obviously this isn't a tidy solution.Is there anyway that I can directly read data from the .cds file with VB.Net? It seems like this would be something that is not too complex and wouldn't be too different from just reading a .csv file.
StudentId Marks obtain class 1001 76 NINE 1002 75 NINE 1003 55 NINE 1004 62 NINE 1005 38 EIGHT 1006 56 EIGHT 1007 31 EIGHT 1008 57 NINE 1009 48 EIGHT 1010 55 NINE 1011 49 NINE 1012 49 EIGHT 1013 27 NINE 1014 31 NINE 1015 48 NINE 1016 58 NINE 1017 31 NINE 1018 36 NINE
This is my database now I want to calculate rank from above this. I call this through procedure. If I select id 1001 then it will display the rank from the above data base. If I select 1007 then it must display rank to class eight.
I have tried to test out the add delete and save function on a datagridview but the data that I added during testing would disappear after I made some changes to the code.
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My problem is probably ignorance as to how the DGV works, anyway, the problem.I have a bound datagridview which is used to collect user input. Data for 3 of the 7 fields is entered by looping through the rows and progmatically entering common data anfter a 'Save' Button is pressed:
For I = 0 To DG1.RowCount - 2 DG1.Rows(I).Cells(4).Value = TextBox1.Text 'Operator DG1.Rows(I).Cells(5).Value = TextBox2.Text 'Date DG1.Rows(I).Cells(6).Value = TextBox3.Text 'Time[code]....
At this point the DGV looks the way it should...All fields completed correctly and no un used ro except for the new row.After saving :
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Now i want to decode/remove the html tags and display it properly to the user such as...
[Code]...
I am setting the value to a Text box where the TEXTMODE property of the text box is set to MULITILINE for scroll. Setting it to a normal Label work but not for my text box.......
