Marc333
asked on
Updating the Dataset
Hello experts,
I've got a pretty simple one, "I think". I originally created a form with a datagrid based off of a DataAdapter/Dataset created by the wizard. Along with that, I had an "Update" button and everything worked. Since then, I moved the DataAdapter/DataSet into the code for more control. However, now my Update button isn't working and I'm having a hard time fixing it. Any ideas? Here's the code I'm using currently:
Private Sub Updatebtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Updatebtn.Click
Dim strConnectionString1 As String = _
"Provider = Microsoft.Jet.OLEDB.4.0;" & _
"Data Source = C:\progr\progr_be.mdb;"
Dim strsqlA = _
"SELECT * FROM Actives;"
Dim objConnection1 As New OleDb.OleDbConnection(strC onnectionS tring1)
Dim OleDBDataAdapter1 As New OleDb.OleDbDataAdapter(str sqlA, objConnection1)
Dim ActivesDS1 As New DataSet()
' OleDBDataAdapter1.Fill(Act ivesDS1, "Actives")
' DataGrid1.DataSource = ActivesDS1.Tables(0)
If ActivesDS1.HasChanges Then
OleDBDataAdapter1.Update(A ctivesDS1)
End If
End Sub
I've got a pretty simple one, "I think". I originally created a form with a datagrid based off of a DataAdapter/Dataset created by the wizard. Along with that, I had an "Update" button and everything worked. Since then, I moved the DataAdapter/DataSet into the code for more control. However, now my Update button isn't working and I'm having a hard time fixing it. Any ideas? Here's the code I'm using currently:
Private Sub Updatebtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Updatebtn.Click
Dim strConnectionString1 As String = _
"Provider = Microsoft.Jet.OLEDB.4.0;" & _
"Data Source = C:\progr\progr_be.mdb;"
Dim strsqlA = _
"SELECT * FROM Actives;"
Dim objConnection1 As New OleDb.OleDbConnection(strC
Dim OleDBDataAdapter1 As New OleDb.OleDbDataAdapter(str
Dim ActivesDS1 As New DataSet()
' OleDBDataAdapter1.Fill(Act
' DataGrid1.DataSource = ActivesDS1.Tables(0)
If ActivesDS1.HasChanges Then
OleDBDataAdapter1.Update(A
End If
End Sub
ASKER CERTIFIED SOLUTION
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Is it filling the datagrid? You have that commented out in your question.
Also, do you have a primary key set?
ASKER
The datagrid is filling. Actually, the datagrid is filled on the load event. And to be specific, what happens with the original code is that the data is changed and it looks ok, but when I leave the form and come back, its the old data.
Also, there is a primary key called "ID".
Also, there is a primary key called "ID".
ASKER
By the way, the reason I don't get an error on the original code is that the program is not seeing the HasChanges event triggered, so it skips the Update command. If I take out the "IF" portion, it gets the error as well.
Is your connection commands the exact same in the load event as they are in the save event?
ASKER
Yes they are the same. One thing thats kind of interesting is that, I uncommented the Fill and Datasource comments, and now, when I push the button, it goes back to the old data. I imagine that its refilling it with the old data.
Okay, try this:
Put list at the top of your form:
Dim strConnectionString1 As String = _
"Provider = Microsoft.Jet.OLEDB.4.0;" & _
"Data Source = C:\progr\progr_be.mdb;"
Dim strsqlA = "SELECT * FROM Actives;"
Dim objConnection1 As New OleDb.OleDbConnection(strC onnectionS tring1)
Dim OleDBDataAdapter1 As New OleDb.OleDbDataAdapter(str sqlA, objConnection1)
Dim ActivesDS1 As New DataSet()
Then in the load event put this:
OleDBDataAdapter1.Fill(Act ivesDS1, "Actives")
DataGrid1.DataSource = ActivesDS1.Tables(0)
Then in your save event put this:
Dim cb As OleDb.OleDbCommandBuilder = New OleDb.OleDbCommandBuilder( OleDBDataA dapter1)
OleDBDataAdapter1.Update(A ctivesDS1, "Actives")
I hope I am not leading you down the wrong path. I haven't had the need to connect to access in a while.
Put list at the top of your form:
Dim strConnectionString1 As String = _
"Provider = Microsoft.Jet.OLEDB.4.0;" & _
"Data Source = C:\progr\progr_be.mdb;"
Dim strsqlA = "SELECT * FROM Actives;"
Dim objConnection1 As New OleDb.OleDbConnection(strC
Dim OleDBDataAdapter1 As New OleDb.OleDbDataAdapter(str
Dim ActivesDS1 As New DataSet()
Then in the load event put this:
OleDBDataAdapter1.Fill(Act
DataGrid1.DataSource = ActivesDS1.Tables(0)
Then in your save event put this:
Dim cb As OleDb.OleDbCommandBuilder = New OleDb.OleDbCommandBuilder(
OleDBDataAdapter1.Update(A
I hope I am not leading you down the wrong path. I haven't had the need to connect to access in a while.
I think the problem is you created a dataset on the load event and then another one by the same name in the save event and then checked for changes and there weren't any because it was a brand new dataset.
ASKER
Where do I put the first part? Does that go in the "Region" area?
DataGrid1.DataSource = ActivesDS1.Tables("Actives ")
Should look something like this:
Public Class Form1
Dim strConnectionString1 As String = _
"Provider = Microsoft.Jet.OLEDB.4.0;" & _
"Data Source = C:\progr\progr_be.mdb;"
Dim strsqlA = "SELECT * FROM Actives;"
Dim objConnection1 As New OleDb.OleDbConnection(strC onnectionS tring1)
Dim OleDBDataAdapter1 As New OleDb.OleDbDataAdapter(str sqlA, objConnection1)
Dim ActivesDS1 As New DataSet()
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
OleDBDataAdapter1.Fill(Act ivesDS1, "Actives")
DataGridView1.DataSource = ActivesDS1.Tables("Actives ")
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim cb As OleDb.OleDbCommandBuilder = New OleDb.OleDbCommandBuilder( OleDBDataA dapter1)
OleDBDataAdapter1.Update(A ctivesDS1, "Actives")
End Sub
End Class
Public Class Form1
Dim strConnectionString1 As String = _
"Provider = Microsoft.Jet.OLEDB.4.0;" & _
"Data Source = C:\progr\progr_be.mdb;"
Dim strsqlA = "SELECT * FROM Actives;"
Dim objConnection1 As New OleDb.OleDbConnection(strC
Dim OleDBDataAdapter1 As New OleDb.OleDbDataAdapter(str
Dim ActivesDS1 As New DataSet()
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
OleDBDataAdapter1.Fill(Act
DataGridView1.DataSource = ActivesDS1.Tables("Actives
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim cb As OleDb.OleDbCommandBuilder = New OleDb.OleDbCommandBuilder(
OleDBDataAdapter1.Update(A
End Sub
End Class
ASKER
Well, I think this is very close. I'm still getting an error message
An unhandled exception of type 'System.Data.OleDb.OleDbEx ception' occurred in system.data.dll
But otherwise, its loading and doing all the things its supposed to. Also the Has Changes event is now being triggered correctlly.
An unhandled exception of type 'System.Data.OleDb.OleDbEx
But otherwise, its loading and doing all the things its supposed to. Also the Has Changes event is now being triggered correctlly.
Imports System
Imports System.Data
Imports System.Data.Oledb
Put this at the very top of your form
Imports System.Data
Imports System.Data.Oledb
Put this at the very top of your form
ASKER
Hmm.. no dice. Still got the message...
Post your code.
ASKER
' I did get delete out the Regions portion which expanded automatically.
Imports System
Imports System.Data
Imports System.Data.Oledb
Public Class Analysisfm
Inherits System.Windows.Forms.Form
Dim strConnectionString1 As String = _
"Provider = Microsoft.Jet.OLEDB.4.0;" & _
"Data Source = C:\progr\progr_be.mdb;"
Dim strsqlA = "SELECT * FROM Actives;"
Dim objConnection1 As New OleDb.OleDbConnection(strC onnectionS tring1)
Dim OleDBDataAdapter1 As New OleDb.OleDbDataAdapter(str sqlA, objConnection1)
Dim ActivesDS1 As New DataSet()
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
OleDBDataAdapter1.Fill(Act ivesDS1, "Actives")
DataGrid1.DataSource = ActivesDS1.Tables("Actives ")
End Sub
Private Sub Updatebtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Updatebtn.Click
If ActivesDS1.HasChanges Then MsgBox("here")
Dim cb As OleDb.OleDbCommandBuilder = New OleDb.OleDbCommandBuilder( OleDBDataA dapter1)
OleDBDataAdapter1.Update(A ctivesDS1, "Actives")
End Sub
Imports System
Imports System.Data
Imports System.Data.Oledb
Public Class Analysisfm
Inherits System.Windows.Forms.Form
Dim strConnectionString1 As String = _
"Provider = Microsoft.Jet.OLEDB.4.0;" & _
"Data Source = C:\progr\progr_be.mdb;"
Dim strsqlA = "SELECT * FROM Actives;"
Dim objConnection1 As New OleDb.OleDbConnection(strC
Dim OleDBDataAdapter1 As New OleDb.OleDbDataAdapter(str
Dim ActivesDS1 As New DataSet()
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
OleDBDataAdapter1.Fill(Act
DataGrid1.DataSource = ActivesDS1.Tables("Actives
End Sub
Private Sub Updatebtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Updatebtn.Click
If ActivesDS1.HasChanges Then MsgBox("here")
Dim cb As OleDb.OleDbCommandBuilder = New OleDb.OleDbCommandBuilder(
OleDBDataAdapter1.Update(A
End Sub
ASKER
One thought did come to mind. When I had the OleDBDataAdapter/DataSet created by the Wizard, I do believe that the program automatically created the Update Queries. Do you think that the program was able to make the update because of those generated queries?
What else does the error say?
ASKER
This is the entire message:
An unhandled exception of type 'System.Data.OleDb.OleDbEx ception' occurred in system.data.dll
An unhandled exception of type 'System.Data.OleDb.OleDbEx
I just used this code and it worked fine.
Public Class Form1
Dim strConnectionString1 As String = _
"Provider = Microsoft.Jet.OLEDB.4.0;" & _
"Data Source = C:\program files\contractors.mdb;"
Dim st = "SELECT Name FROM Allcontractors;"
Dim conn As New OleDb.OleDbConnection(strC onnectionS tring1)
Dim da As New OleDb.OleDbDataAdapter(st, conn)
Dim ds As New DataSet()
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
da.Fill(ds, "Contractors")
DataGridView1.DataSource = ds.Tables("Contractors")
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim cb As OleDb.OleDbCommandBuilder = New OleDb.OleDbCommandBuilder( da)
da.Update(ds, "Contractors")
End Sub
End Class
Public Class Form1
Dim strConnectionString1 As String = _
"Provider = Microsoft.Jet.OLEDB.4.0;" & _
"Data Source = C:\program files\contractors.mdb;"
Dim st = "SELECT Name FROM Allcontractors;"
Dim conn As New OleDb.OleDbConnection(strC
Dim da As New OleDb.OleDbDataAdapter(st,
Dim ds As New DataSet()
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
da.Fill(ds, "Contractors")
DataGridView1.DataSource = ds.Tables("Contractors")
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim cb As OleDb.OleDbCommandBuilder = New OleDb.OleDbCommandBuilder(
da.Update(ds, "Contractors")
End Sub
End Class
How may columns in the table
ASKER
Hmm.. Well there are 22 columns total.
Tell you what. I'm going to call it a night and revisit this again in the morning. I'll try re-entering the code, or I may try building it with everything the exact same as you've got above. If that doesn't work, I may have to come up with another work-around solution.
I'm going to go ahead and award the points because of all the help. Thanks again, I really appreciate it.
Marc
Tell you what. I'm going to call it a night and revisit this again in the morning. I'll try re-entering the code, or I may try building it with everything the exact same as you've got above. If that doesn't work, I may have to come up with another work-around solution.
I'm going to go ahead and award the points because of all the help. Thanks again, I really appreciate it.
Marc
Try this. It will only fill the dataset with the primary key. It may be throwing the exception if there are empty fields in some of your columns.
Imports System
Imports System.Data
Imports System.Data.Oledb
Public Class Analysisfm
Inherits System.Windows.Forms.Form
Dim strConnectionString1 As String = _
"Provider = Microsoft.Jet.OLEDB.4.0;" & _
"Data Source = C:\progr\progr_be.mdb;"
Dim strsqlA = "SELECT ID FROM Actives;"
Dim objConnection1 As New OleDb.OleDbConnection(strC onnectionS tring1)
Dim OleDBDataAdapter1 As New OleDb.OleDbDataAdapter(str sqlA, objConnection1)
Dim ActivesDS1 As New DataSet()
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
OleDBDataAdapter1.Fill(Act ivesDS1, "Actives")
DataGrid1.DataSource = ActivesDS1.Tables("Actives ")
End Sub
Private Sub Updatebtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Updatebtn.Click
If ActivesDS1.HasChanges Then MsgBox("here")
Dim cb As OleDb.OleDbCommandBuilder = New OleDb.OleDbCommandBuilder( OleDBDataA dapter1)
OleDBDataAdapter1.Update(A ctivesDS1, "Actives")
End Sub
Imports System
Imports System.Data
Imports System.Data.Oledb
Public Class Analysisfm
Inherits System.Windows.Forms.Form
Dim strConnectionString1 As String = _
"Provider = Microsoft.Jet.OLEDB.4.0;" & _
"Data Source = C:\progr\progr_be.mdb;"
Dim strsqlA = "SELECT ID FROM Actives;"
Dim objConnection1 As New OleDb.OleDbConnection(strC
Dim OleDBDataAdapter1 As New OleDb.OleDbDataAdapter(str
Dim ActivesDS1 As New DataSet()
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
OleDBDataAdapter1.Fill(Act
DataGrid1.DataSource = ActivesDS1.Tables("Actives
End Sub
Private Sub Updatebtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Updatebtn.Click
If ActivesDS1.HasChanges Then MsgBox("here")
Dim cb As OleDb.OleDbCommandBuilder = New OleDb.OleDbCommandBuilder(
OleDBDataAdapter1.Update(A
End Sub
ASKER
Maralans,
I'll give that a try tonight and let you know how it goes. You're absolutely right though about the empty values. I have several columns where null values are very typical.
I'll give that a try tonight and let you know how it goes. You're absolutely right though about the empty values. I have several columns where null values are very typical.
ASKER
An unhandled exception of type 'System.InvalidOperationEx
Additional information: Update unable to find TableMapping['Actives'] or DataTable 'Actives'.
Any thoughts?