Update Access database via OleDB from DataGridView

Question

I have been scouring these forums and the internet in general as well as doing a lot of reading, all to no avail.  I can not seem to successfully update the Access database from an edited DataGridView.  I am trying to use Stored Procedures that
are in the Access database and work fine therein.  The DGV is filled in properly.  I have tried an ever-increasing number of variants to update the database (Private Sub BtnUpdate...)  without success.  I'd really, really appreciate some
guidance here.
Here is my code thus far:
Public Class Form1
    Dim con As OleDbConnection    
    Dim cmd As OleDbCommand
    Dim da As OleDbDataAdapter
    Dim ds As DataSet
    Dim ProviderConnectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="
    Dim TargetList As String = "C:\Users\Administrator\Documents\Visual Studio 2010\Projects\Development5\Test.mdb"
    Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        'establish a connection to the database
        con = New OleDbConnection(ProviderConnectionString & TargetList)
        con.Open()
        'define the command to be used
        cmd = New OleDbCommand
        cmd.Connection = con
        cmd.CommandType = CommandType.StoredProcedure
        cmd.CommandText = "ListAllTargets"
         'create the data adapter based on the command
        da = New OleDbDataAdapter(cmd)
        'fill the data set based on the command
        ds = New DataSet
        da.Fill(ds, "AllTargets")
        'bind and load dgvTargets with the data
        dgvTargetList.DataSource = ds.Tables("AllTargets")  ' Binding to dgvtargetlist
     End Sub
    Private Sub btnUpdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnUpdate.Click
         da.UpdateCommand = New OleDbCommand("UPDATE TargetList SET;", con)
        Validate()
        da.Update(ds.Tables("AllTargets"))
        Me.ds.AcceptChanges()
    End Sub
End Class

Answer 1

Hi John,
Welcome to MSDN forums!
Cor pointed you to the right direction. An OleDBCommandbuilder object is required, which can be used to automatically
generate DeleteCommand, UpdateCommand and InsertCommand for DataAdapter object.
Here is detailed walkthrough: How to update
(Insert/Update/Delete) data back into MS Access database from DataGridView.
1) New a WinForms project, drag&drop DataGridView1 and Button1 onto
Form1.
2) Add database file test.mdb to project via: Data menu -> Add New Data Source
Wizard ... then you can use ralative path to this database file in code
3) Select/click
your database file test.mdb in Solution Explorer
-> Properties Pane
-> change the "copy to ouput directory" to "copy
if newer"
4) Code sample
Imports System.Data.OleDb
Public
Class Form1
Dim myDA As OleDbDataAdapter
Dim myDataSet As DataSet
Private Sub Form1_Load(ByVal sender
As System.Object, ByVal e
As System.EventArgs) Handles
MyBase.Load
Dim con As OleDbConnection =
New OleDbConnection("Provider=Microsoft.jet.oledb.4.0;data source=|DataDirectory|\test.mdb")  ' Use relative path to database file
Dim cmd As OleDbCommand =
New OleDbCommand("SELECT * FROM Table1", con)
con.Open()
myDA = New OleDbDataAdapter(cmd)
'Here one CommandBuilder object is required.
      'It will automatically generate DeleteCommand,UpdateCommand and InsertCommand for DataAdapter object  
Dim builder As OleDbCommandBuilder =
New OleDbCommandBuilder(myDA)
myDataSet = New DataSet()
myDA.Fill(myDataSet, "MyTable")
DataGridView1.DataSource = myDataSet.Tables("MyTable").DefaultView
con.Close()
con = Nothing
End Sub
' Save data back into database  
Private Sub Button1_Click(ByVal sender
As System.Object, ByVal e
As System.EventArgs) Handles Button1.Click
Me.Validate()
Me.myDA.Update(Me.myDataSet.Tables("MyTable"))
Me.myDataSet.AcceptChanges()
End Sub
End
Class
Best regards,
Martin Xie
MSDN Subscriber
Support in Forum
If you have any feedback on our support, please contact
[email protected]
Please remember to mark the replies as answers if they help and unmark them if they provide no help.
Welcome to the All-In-One Code Framework! If you have any feedback, please tell us.