Move Method Example (VB)


This example uses the Move method to position the record pointer based on user input.


    '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 As String
     ' record variables
    Dim varBookmark As Variant
    Dim strCommand As String
    Dim lngMove As Long

    ' 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 allow use of AbsolutePosition property
    strSQLAuthors = "SELECT au_id, au_fname, au_lname, city, state FROM Authors ORDER BY au_lname"
    rstAuthors.Open strSQLAuthors, strCnxn, adOpenStatic, adLockOptimistic, adCmdText


        ' Display information about current record and
        ' ask how many records to move

        strCommand = InputBox( _
            "Record " & rstAuthors.AbsolutePosition & _
            " of " & rstAuthors.RecordCount & vbCr & _
            "Author: " & rstAuthors!au_fname & _
            " " & rstAuthors!au_lname & vbCr & _
            "Location: " & rstAuthors!city & _
            ", " & rstAuthors!State & vbCr & vbCr & _
            "Enter number of records to Move " & _
            "(positive or negative).")

          ' this is for exiting the loop
        'lngMove = CLng(strCommand)

        lngMove = CLng(Val(strCommand))
        If lngMove = 0 Then
            MsgBox "You either entered a non-number or canceled the input box. Exit the application."
            Exit Do
        End If

        ' Store bookmark in case the Move goes too far
        ' forward or backward
        varBookmark = rstAuthors.Bookmark

        ' Move method requires parameter of data type Long
        rstAuthors.Move lngMove

        ' Trap for BOF or EOF
        If rstAuthors.BOF Then
            MsgBox "Too far backward! Returning to current record."
            rstAuthors.Bookmark = varBookmark
        End If
        If rstAuthors.EOF Then
            MsgBox "Too far forward!  Returning to current record."
            rstAuthors.Bookmark = varBookmark
        End If

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

    ' 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