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vb.net dataset errors connecting to SQL server and displaying fields on form.
Posted on 2016-07-20
New to SQL and VB.Net but have used Access and VBA for years. I have a couple of questions regarding the code below. I get an error saying there is no row at position 0. I don't even know what that means, let alone what to do about it. Also, I have 3 comboboxes on the form I am trying to populate. They fill automatically when the form loads, but I want them to select the item that represents the specific record in the database. For example: I have 10 stores in the dropdown, but the record I am trying to retrieve is associated with the ID 5. It's DisplayMember is the name of the store, but its ValueMember is an ID. I want the combobox to select the the ID associated with the record in SQL and then display the DisplayMember correctly. Can I do this? Here is the code:
Public Sub psFillDataset()
Dim conn As New SqlConnection(sqlComm)
Try
Dim sSQL As String
sSQL = "Select * from tvwLeads where numLeadID=" & numSelected & " order by numLeadID"
MsgBox(numSelected)
Dim dbadp As New SqlDataAdapter(sSQL, sqlComm)
Dim dTable As New DataTable
dbadp.Fill(dTable)
dbadp.Dispose()
Me.txtSource.DataSource = dTable
Me.txtType.Text = ("strType").ToString()
Me.txtClient.Text = ("numClient").ToString()
Me.txtLast.Text = dTable.Rows(0)("strLast").
Me.txtFirst.Text = dTable.Rows(0)("strFirst")
Me.tmTO.Text = dTable.Rows(0)("tmTO").ToS
Me.dtTO.Text = dTable.Rows(0)("dtTO").ToS
Me.tmCT.Text = dTable.Rows(0)("tmCTC").To
Me.dtCT.Text = dTable.Rows(0)("dtCTC").To
Me.chkBad.Text = dTable.Rows(0)("ysnBad").T
Me.txtManager.Text = dTable.Rows(0)("strManager
Me.cboSales.Text = dTable.Rows(0)("strName").
Me.txtNotes.Text = dTable.Rows(0)("strNotes")
Me.txtEmail.Text = dTable.Rows(0)("strRespons
Me.txtID.Text = dTable.Rows(0)("numLeadID"
Me.txtSource.DisplayMember
Me.cboVehicle.DisplayMembe
Catch ex As Exception
MsgBox(ex.Message)
End Try
End Sub
Public Sub psFillDataset()
Dim conn As New SqlConnection(sqlComm)
Try
Dim sSQL As String
sSQL = "Select * from tvwLeads where numLeadID=" & numSelected & " order by numLeadID"
MsgBox(numSelected)
Dim dbadp As New SqlDataAdapter(sSQL, sqlComm)
Dim dTable As New DataTable
dbadp.Fill(dTable)
dbadp.Dispose()
Me.txtSource.DataSource = dTable
Me.txtType.Text = ("strType").ToString()
Me.txtClient.Text = ("numClient").ToString()
Me.txtLast.Text = dTable.Rows(0)("strLast").
Me.txtFirst.Text = dTable.Rows(0)("strFirst")
Me.tmTO.Text = dTable.Rows(0)("tmTO").ToS
Me.dtTO.Text = dTable.Rows(0)("dtTO").ToS
Me.tmCT.Text = dTable.Rows(0)("tmCTC").To
Me.dtCT.Text = dTable.Rows(0)("dtCTC").To
Me.chkBad.Text = dTable.Rows(0)("ysnBad").T
Me.txtManager.Text = dTable.Rows(0)("strManager
Me.cboSales.Text = dTable.Rows(0)("strName").
Me.txtNotes.Text = dTable.Rows(0)("strNotes")
Me.txtEmail.Text = dTable.Rows(0)("strRespons
Me.txtID.Text = dTable.Rows(0)("numLeadID"
Me.txtSource.DisplayMember
Me.cboVehicle.DisplayMembe
Catch ex As Exception
MsgBox(ex.Message)
End Try
End Sub
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17 Comments
Active today
>> I get an error saying there is no row at position 0
that means that your select query returns no row and you are trying to update the first row (index = 0)
that means that your select query returns no row and you are trying to update the first row (index = 0)
Thanks, I was using the wrong table. More importantly to me is what I'm trying to do with the comboboxes. Possible?
Active today
how are you filling the combo boxes with all the various available values? They need to be fed somewhere (often in the form load). Once fed, you can set the current value like this:
check https://msdn.microsoft.com/en-us/library/system.windows.forms.listcontrol.selectedvalue(v=vs.110).aspx
Me.cboVehicle.SelectedValue = dTable.Rows(0)("yourvehicleidvariable")
check https://msdn.microsoft.com/en-us/library/system.windows.forms.listcontrol.selectedvalue(v=vs.110).aspx
Thank you so much! One last question. These two fields are not displaying the value in the textbox. They are displaying strType and numClient. However, the information is in the database and the field names are correctly spelled. Any thoughts?
Me.txtType.Text = ("strType").ToString()
Me.txtClient.Text = ("numClient").ToString()
Me.txtType.Text = ("strType").ToString()
Me.txtClient.Text = ("numClient").ToString()
Active today
because you simply set those values!
your code surely needs to be:
your code surely needs to be:
Me.txtType.Text = dTable.Rows(0)("strType").ToString()
Me.txtClient.Text = dTable.Rows(0)("numClient").ToString()
Some of my comboboxes still not populating, but they're just filled in with items, not connected to the database. Do I still handle them the same with selected value? If so, they aren't working. Also, I have 2 checkboxes that arent populating. The database shows them as 0s and 1s. Are they handled differently?
Active today
how and where do you feed those combos?
as for checkboxes, you need special code:
as for checkboxes, you need special code:
Me.chkBad.Checked = (dTable.Rows(0)("ysnBad").ToString() = "1")
Thanks. This is how I fill the comboboxes on the ones that aren't populating:
cboVehicle.Items.Clear()
cboVehicle.DisplayMember = "Text"
cboVehicle.Items.Add(New With {.Text = "NEW"})
cboVehicle.Items.Add(New With {.Text = "USED"})
cboContact.Items.Clear()
cboContact.DisplayMember = "Text"
cboContact.Items.Add(New With {.Text = "LE"})
cboContact.Items.Add(New With {.Text = "L/M & LE"})
cboContact.Items.Add(New With {.Text = "Not Determined"})
cboContact.Items.Add(New With {.Text = "YES"})
cboContact.Items.Add(New With {.Text = "NO"})
Then I use Me.cboContact.SelectedValu
Me.cboVehicle.SelectedValu
to put them back into the form.
cboVehicle.Items.Clear()
cboVehicle.DisplayMember = "Text"
cboVehicle.Items.Add(New With {.Text = "NEW"})
cboVehicle.Items.Add(New With {.Text = "USED"})
cboContact.Items.Clear()
cboContact.DisplayMember = "Text"
cboContact.Items.Add(New With {.Text = "LE"})
cboContact.Items.Add(New With {.Text = "L/M & LE"})
cboContact.Items.Add(New With {.Text = "Not Determined"})
cboContact.Items.Add(New With {.Text = "YES"})
cboContact.Items.Add(New With {.Text = "NO"})
Then I use Me.cboContact.SelectedValu
Me.cboVehicle.SelectedValu
to put them back into the form.
Active today
in this case, you can simplify the syntax to:
then you will be able to use:
cboVehicle.Items.Clear()
cboVehicle.Items.Add("NEW")
cboVehicle.Items.Add("USED")
then you will be able to use:
Me.cboVehicle.Text = dTable.Rows(0)("strLeadType").tostring
Perfect, but checkboxes still not working. If I'm understanding you correctly, I place that code in the same spot as all the other code we worked on and if it is a 1 in the database, it should show as checked on the form. If so, it isn't showing as such. Also, if there is a null value will I get the message that there is no row at position 0? I am getting it for certain records that I know have some data but not all of the fields. How do you handle that?
Active today
NULLs are a special value and you need to process them specially! You won't get an exception saying that there is no row at position 0 because this is really when there are no rows in your datatable.
To check for NULLs, you should:
For checkboxes, you can try:
To check for NULLs, you should:
if dTable.Rows(0)("strType") isnot nothing then
Me.txtType.Text = dTable.Rows(0)("strType").ToString()
end if
For checkboxes, you can try:
if dTable.Rows(0)("ysnBad") is nothing orelse dTable.Rows(0)("ysnBad").ToString() = "0") then
Me.chkBad.Checked = false
else
Me.chkBad.Checked = true
end if
That code looks exactly right but now it checks the boxes are always checked. Ugh, I want to go back to VBA. Do you know a good book that gets into this level of coding?
Active today
what do you get if you do :
messagebox.show(dTable.Rows(0)("ysnBad").ToString())
Got error before running: argument not specified for parameter "Prompt" of "Publci Function MsgBox(Prompt as Object,[Buttons as MsgboxStyle=ApplicationMod
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