I am trying to write data back to my database in my project, but it keeps disappering when I make any changes to code. I can build the project, add data, close the project and build it again and the data is still there. But as soon as I make any changes to anything, on the next build, all of the data is gone.
The table will not be bound to any controls in the final project, but for testing purposes I have a datagrid control that it is bound to. My code started as follows:
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 want to be able to click on the save icon and have the data on the form save to the original database. Right now I seem to have a disconnected dataset I have tried to change everything from read only to a false statement but it just will not work. It saves to the form fine just not the orignial data base.
I use Visual Basic in Access, and I have no problem writing data directly to a cell in a database table. But I can not figure out how to write the code for Visual Basic 2008. For example I would use Me![cust_Cost] = 20 to input 20 in the database table. I have purchased two different Books on Visual Basic 2008 and not one of them show how to input data manually.
when i try to insert data from database into dataset using data adapter, it takes long time, i want to use hourglass but i'm confused how or when i type the code so user will know that application still work.
I created a database (.mdf) file. I added data to it after running the program in debug mode. When I closed it and opened it up again, the data I got was stored and loaded again.I closed my whole Visual Basic Express program. When I opened it up again, all the data had disappeared.
Can you tell me what I am doing wrong with the program? I can't get queries to work either. It worked when I used the NOrthwind dataset this past weekend but it is not working when I use my own or empty dataset.
I have inherited some code from an external contractor that I have to modify. Firstly, he uses a strongly typed dataset to retrieve some data from an SQL database and then uses that data to populate a listbox. I have decided to use a dropdown list (as the user can only ever select one value at a time).This is the code that populates the DropDownList
Private Sub FillUserComputer(ByVal userId As String) Try TraceDebug("Begin FillUserComputer"[code]....
This works well for the first two entries in the DropDownList. However, whenever I select one of the other options and click the Send Request button it "jumps back" to the 2nd entry in the list and sends that data instead, completely ignoring the option I selected.I think I have narrowed down the problem to the fact that the DataValue for the second entry in the list is a Null value.
I have a gridview loaded with data from my database and a gridview swapping function which after exchanging data between rows with a column call "Priority", I want to save these changes back to my database. Only the "Priority" column value will be change, how do I update only that Column of my dataset table to my SQL database?
I want to track changes in an application. So I've made a copy of the main table in that application, and am accessing both tables in the application using two separate datasets.
My plan was to use the HasChanges method of the main DataSet to get changed rows and then insert those into the copy table. When I run the code I get an error:
A first chance exception of type 'System.InvalidCastException' occurred in MyApp.exe
Unable to cast object of type 'MainDataTable' to type 'MainAuditDataTable'.
Here's the code:
If Me.DataSet3.HasChanges Then ' 'look for each row that has changes, not new rows ' 'insert that row into the auditing table
why this does not output any data to the xml file?
'this displays all records Me.SQLString = New OleDbCommand("SELECT * FROM FlightDetails", DBConnection) ' WHERE FlightDetails.ReportNumber=BeforePushback.ReportNumber", DBConnection) 'establish data adapter/data table
[code]....
There is no exception or error thrown, the debugger just skips over it.The FlightDetailsTable contains data as it is bound to text boxes on my form. I just don't know why the data is not written as xml to the file.The file created contains this line '<?xml version="1.0" standalone="yes"?>' and that is all.
How do you restore a dataset to the previous state before updating the database with a data adapter? I have a concurrency update problem that I believe to be caused by this. The update fails during the update and a rollback command is issued using a SQLTransaction object. However, now the rowstates of the rows that did not have errors have been changed to unchanged. So this record is no longer availible to be inserted into the database. When I updated the value that could not be null and then test the second update which runs just as the first does then I get a concurrency error. The update code is below:
Public Class Form1 Dim ds As New DataSet Dim xd As XDocument Dim Qual1, Qual2 As String Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load [Code] .....
How do I make it so when I click the button it saves to the selected element that is selected in cb
My question is my code for populating employee information based on the name selected in the combobox cb works, However I need to be able to write QUAL1 and QUAL2 to the employees whose name is in the combo box.
I have an XML file that is being updated via ASP.NET. The user should be able to add new nodes to the XML file AT ANY LOCATION in the node tree.
The XML file is read into a DataSet using DataSet.ReadXml(filename).
A new row is added to the appropriate DataTable, using InsertAt(row, index).
I have confirmed using a DataGrid, and using a loop (For Each dRow in Table, Response.Write..) that the new Row was inserted into the table at the correct spot (in my example code, the 3rd position).
However, The WriteXml() method is writing the node to the END of the XML tree! I can't get it to see the tree with the node in the correct location.
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load Dim sXML_Lesson As String = "test.xml"
I'm trying to write to a specific cell located in the datatable, which is from dataset. I know that it would be datagridview1.rows(xx).columns(xx).value=(""). But how to do it in a datatable
Public Class Form1 Dim ds As New DataSet1 Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Dim TestValue As String = "test value" [Code] .....
The following code above does write to column 3 row 1, but if you say .rows(1), i get "there is no row at position 1". So, in summary if I have 7 columns, and I created a second row I want to write to column 3 and the 2nd row.
Only my local dataset updates when adding, deleting or editing records.The Source Database is supposed to update on issuing DataAdapter. Update(dataset )However, when I check my source database after running the operations it remains the same as the original.
I have a problem saving a dataset which contains rows that i have imported from another dataset. i can successfully view the imported rows in a gridview but i cannot commit the rows back to the database.
I have tried everything I can to get beyond this error which shows below as <<<<< error here. It is trying to fill a dataset from a data adapter. If I change the SELECT statement to just SELECT * FROM xTable I get the correct number of records in each table. But anytime I try with a more complex statement I get the error message shown below which indicates System.Data.Common.DbDataAdapter.Fill(DataSet dataSet. I've completely erased all data and entered a new set of test data so I know there is no problem with relationships. Each table has primary key which is foreign key in other table. IS there something wrong with the Imports section: Imports System
i am trying to copy data from a standard Dataset to a Type Dataset (XSD) of same table structure. i want to use Automapper to do that one. So how can i do that using automapper?
I have two Datagrids, One grid has all the customers garments on it with style number and contact length. The other grid has the users who have garment issued to them. the style number is in both grids. I need to loop through the users grid and say if the contract number is 1 from the first grid then the contract date on the second grid will be todays date + 365 days (year contract) I have looked at using a stored procedure and also a for each command but I am just getting stuck with it all. [Code]
I created a SQL database using the migration tool.I am converting my access forms to VB.net (VS2008).I am wondering if I create a single dataset in studio to the database or do I create a dataset for each form (query)? I am trying to determine what the best solution is. Many of my forms have drop downs that are populated using queries from tables.
Basically I want to write to a database, lets say called testdatabase, and I want to write to a table called dbo.Test_table, under three different colums named one two three. How do I go about this? I created a data set connection to the database but it sits on the right hand side with the other forms and I dont know how to use it or write to those colums in the tables.
I had a dataSet which link to a database. I need to add one field inside the database, After adding the field, how can I update and link it to the dataSet?
I'm makin an application which will calculate the amount of carpet needed to floor a room, i would like to add in an order management bit too the application so that the user can add, delete and amend pending jobs. I'm a bit of a beginner so i don't know which way is really best to go, should i use file writing on database? I will be takin values from variables and textbox's if thats of any importance.
I have a table in a database with 3 columns: OfferName, ExperienceAward, and GoldAward
I populate a combobox with the various offer names with the code below:
Dim con As OleDbConnection = New OleDbConnection( _ "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:UsersDouglasDocumentsVisual Studio 2008ProjectsGameBoxRPGGameBoxRPGContacts.accdb;Persist Security Info=False") Dim cmd As OleDbCommand = New _
