VB6 run-time error 3709 the connection cannot be used to perform the operation-it is either closed or invalid

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I always get this error everytime I ran the program.

VB

Dim rs As New ADODB.Recordset
rs.Open "Select * From tbluser Where uname = '" & txtuser.Text & "'", cnn, adOpenStatic, adLockReadOnly
If rs.RecordCount < 1 Then
MsgBox "Invalid Username!", vbCritical, "Login Error"
txtuser.SetFocus
Exit Sub
Else
If txtpass.Text = rs!pword Then
Unload Me
Load Form2
Form2.Show
Exit Sub
Else
MsgBox "Invalid Password!", vbCritical, "Login Error"
txtpass.SetFocus
Exit Sub
End If
End If
Set rs = Nothing

MODULE CODE:

VB

Option Explicit

Public cnn As ADODB.Connection
Public Sub getconnected()
  Set cnn = New ADODB.Connection
  cnn.CursorLocation = adUseClient
  cnn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & App.Path & "\Database1.mdb" & ";Persist Security Info=False;"
  
  cnn.Open
    End Sub

THE HIGHLIGHTED CODE:

VB

rs.Open "Select * From tbluser Where uname = '" & txtuser.Text & "'", cnn, adOpenStatic, adLockReadOnly

I just added Module1.getconnected on top of Dim rs As New ADODB.Recordset and it's working but based on the original program that I copied there's no Module1.getconnected

Posted 6-Mar-13 15:51pm

rotsen28

Updated 7-Mar-13 9:37am

Maciej Los

v3

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Maciej Los · Answer 1 · 2013-03-07T09:52:00

If you want to check that user exists or not and you use Button1_Click() event, try this:

VB

Private Sub Button1_Click(...)
Dim cnn As ADODB.Connection
Dim rs As New ADODB.Recordset

On Error Goto Err_Handler

'connect to database
Set cnn = New ADODB.Connection()
cnn.CursorLocation = adUseClient
cnn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & App.Path & "\Database1.mdb" & ";Persist Security Info=False;"
cnn.Open
'create new recordset object
Set rs = New ADODB.Recordset()
rs.Open "Select * From tbluser Where uname = '" & txtuser.Text & "'", cnn, adOpenStatic, adLockReadOnly
If rs.RecordCount <> 1 Then
    Msgbox "Users count: " & rs.RecordCount, vbQuestion, "How is this possible?"
    Goto Exit_Sub
End If

'only one user!!!
'do what you want to do ;)
MsgBox "Welcome!" & vbCr & "Herzlich Willkomen!" &  vbCr & "Witaj!", vbInformation, "Message..."

Exit_Sub:
    On Error Resume Next
    rs.Close
    cnn.Close
    Set rs = Nothing
    set cnn = Nothing
    Exit Sub

Err_Handler:
    Msgbox Err.Description, vbExclamation, "Error " & Err.Number
    Resume Exit_Sub
End Sub