MoveFirst, MoveLast, MoveNext, and MovePrevious Methods Example (VB)
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MoveFirst, MoveLast, MoveNext, and MovePrevious Methods Example (VB)

 

This example uses the MoveFirst, MoveLast, MoveNext, and MovePrevious methods to move the record pointer of a Recordset based on the supplied command. The MoveAny procedure is required for this procedure to run.

'BeginMoveFirstVB

    'To integrate this code
    'replace the data source and initial catalog values
    'in the connection string

Public Sub Main()
    On Error GoTo ErrorHandler

    ' connection and recordset variables
    Dim rstAuthors As ADODB.Recordset
    Dim Cnxn As ADODB.Connection
    Dim strCnxn As String
    Dim strSQLAuthors
     ' record variables
    Dim strMessage As String
    Dim intCommand As Integer

    ' Open connection
    Set Cnxn = New ADODB.Connection
    strCnxn = "Provider='sqloledb';Data Source='MySqlServer';" & _
        "Initial Catalog='Pubs';Integrated Security='SSPI';"
    Cnxn.Open strCnxn

    ' Open recordset from Authors table
    Set rstAuthors = New ADODB.Recordset
    rstAuthors.CursorLocation = adUseClient
    ' Use client cursor to enable AbsolutePosition property
    strSQLAuthors = "Authors"
    rstAuthors.Open strSQLAuthors, Cnxn, adOpenStatic, adLockReadOnly, adCmdTable

    ' Show current record information and get user's method choice
    Do
        strMessage = "Name: " & rstAuthors!au_fname & " " & _
            rstAuthors!au_lname & vbCr & "Record " & _
            rstAuthors.AbsolutePosition & " of " & _
            rstAuthors.RecordCount & vbCr & vbCr & _
            "[1 - MoveFirst, 2 - MoveLast, " & vbCr & _
            "3 - MoveNext, 4 - MovePrevious]"
        intCommand = Val(Left(InputBox(strMessage), 1))

         ' for exiting the loop
        If intCommand < 1 Or intCommand > 4 Then
            MsgBox "You either entered a non-number or canceled the input box. Exit the application."
            Exit Do
        End If

        ' Use specified method while trapping for BOF and EOF
        Select Case intCommand
            Case 1
                rstAuthors.MoveFirst
            Case 2
                rstAuthors.MoveLast
            Case 3
                rstAuthors.MoveNext
                If rstAuthors.EOF Then
                    MsgBox "Already at end of recordset!"
                    rstAuthors.MoveLast
                End If
            Case 4
                rstAuthors.MovePrevious
                If rstAuthors.BOF Then
                    MsgBox "Already at beginning of recordset!"
                    rstAuthors.MoveFirst
                End If
        End Select
    Loop

    ' clean up
    rstAuthors.Close
    Cnxn.Close
    Set rstAuthors = Nothing
    Set Cnxn = Nothing
    Exit Sub

ErrorHandler:
    ' clean up
    If Not rstAuthors Is Nothing Then
        If rstAuthors.State = adStateOpen Then rstAuthors.Close
    End If
    Set rstAuthors = Nothing

    If Not Cnxn Is Nothing Then
        If Cnxn.State = adStateOpen Then Cnxn.Close
    End If
    Set Cnxn = Nothing

    If Err <> 0 Then
        MsgBox Err.Source & "-->" & Err.Description, , "Error"
    End If
End Sub

'EndMoveFirstVB
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