Wednesday, September 2, 2009

Relink MS Access table from startup

original code from and

I made some tweaking and changes to make it suite my application. actually this is combination of 2 different code from site and litle function to check link source and check if file exist or not.

here's the code: (copy and name it as anything at module section. and then create a macro to runCode, select function fRefreshLinks and name this macro to autoExec)

Option Compare Database
'***************** Code Start **************
' This code was originally written by Ken Getz.
' It is not to be altered or distributed, 'except as part of an application.
' You are free to use it in any application,
' provided the copyright notice is left unchanged.
' Code originally courtesy of:
' Microsoft Access 95 How-To
' Ken Getz and Paul Litwin
' Waite Group Press, 1996
' Revised to support multiple files:
' 28 December 2007

    lStructSize As Long
    hwndOwner As Long
    hInstance As Long
    strFilter As String
    strCustomFilter As String
    nMaxCustFilter As Long
    nFilterIndex As Long
    strFile As String
    nMaxFile As Long
    strFileTitle As String
    nMaxFileTitle As Long
    strInitialDir As String
    strTitle As String
    Flags As Long
    nFileOffset As Integer
    nFileExtension As Integer
    strDefExt As String
    lCustData As Long
    lpfnHook As Long
    lpTemplateName As String
End Type

Declare Function aht_apiGetOpenFileName Lib "comdlg32.dll" _
    Alias "GetOpenFileNameA" (OFN As tagOPENFILENAME) As Boolean

Declare Function aht_apiGetSaveFileName Lib "comdlg32.dll" _
    Alias "GetSaveFileNameA" (OFN As tagOPENFILENAME) As Boolean
Declare Function CommDlgExtendedError Lib "comdlg32.dll" () As Long

Global Const ahtOFN_READONLY = &H1
Global Const ahtOFN_HIDEREADONLY = &H4
Global Const ahtOFN_NOCHANGEDIR = &H8
Global Const ahtOFN_SHOWHELP = &H10
' You won't use these.
'Global Const ahtOFN_ENABLEHOOK = &H20
'Global Const ahtOFN_ENABLETEMPLATE = &H40
Global Const ahtOFN_NOVALIDATE = &H100
Global Const ahtOFN_ALLOWMULTISELECT = &H200
Global Const ahtOFN_PATHMUSTEXIST = &H800
Global Const ahtOFN_FILEMUSTEXIST = &H1000
Global Const ahtOFN_CREATEPROMPT = &H2000
Global Const ahtOFN_SHAREAWARE = &H4000
Global Const ahtOFN_NOREADONLYRETURN = &H8000
Global Const ahtOFN_NOTESTFILECREATE = &H10000
Global Const ahtOFN_NONETWORKBUTTON = &H20000
Global Const ahtOFN_NOLONGNAMES = &H40000
' New for Windows 95
Global Const ahtOFN_EXPLORER = &H80000
Global Const ahtOFN_NODEREFERENCELINKS = &H100000
Global Const ahtOFN_LONGNAMES = &H200000

'***************** Code Start ***************
' This code was originally written by Dev Ashish.
' It is not to be altered or distributed,
' except as part of an application.
' You are free to use it in any application,
' provided the copyright notice is left unchanged.
' Code Courtesy of
' Dev Ashish
Function fRefreshLinks() As Boolean
Dim strMsg As String, collTbls As Collection
Dim i As Integer, strDBPath As String, strTbl As String
Dim dbCurr As Database, dbLink As Database
Dim tdfLocal As TableDef
Dim varRet As Variant
Dim strNewPath As String

Const cERR_USERCANCEL = vbObjectError + 1000
Const cERR_NOREMOTETABLE = vbObjectError + 2000

    On Local Error GoTo fRefreshLinks_Err

    If MsgBox("Are you want to reconnect all Access tables?", _
            vbQuestion + vbYesNo, "Please confirm...") = vbNo Then Err.Raise cERR_USERCANCEL

    'First get all linked tables in a collection
    Set collTbls = fGetLinkedTables

    'now link all of them
    Set dbCurr = CurrentDb

    strMsg = "Do you wish to specify a different path for the Access Tables?"
    If MsgBox(strMsg, vbQuestion + vbYesNo, "Alternate data source...") = vbYes Then
        strNewPath = fGetMDBName("Please select a new datasource")
        strNewPath = vbNullString
    End If

    For i = collTbls.Count To 1 Step -1
        strDBPath = fParsePath(collTbls(i))
        strTbl = fParseTable(collTbls(i))
        varRet = SysCmd(acSysCmdSetStatus, "Now linking '" & strTbl & "'....")
        If Left$(strDBPath, 4) = "ODBC" Then
            'ODBC Tables
            'ODBC Tables handled separately
           ' Set tdfLocal = dbCurr.TableDefs(strTbl)
           ' With tdfLocal
           '     .Connect = pcCONNECT
           '     .RefreshLink
           '     collTbls.Remove (strTbl)
           ' End With
            If strNewPath <> vbNullString Then
                'Try this first
                strDBPath = strNewPath
                If Len(Dir(strDBPath)) = 0 Then
                    'File Doesn't Exist, call GetOpenFileName
                    strDBPath = fGetMDBName("'" & strDBPath & "' not found.")
                    If strDBPath = vbNullString Then
                        'user pressed cancel
                        Err.Raise cERR_USERCANCEL
                    End If
                End If
            End If

            'backend database exists
            'putting it here since we could have
            'tables from multiple sources
            Set dbLink = DBEngine(0).OpenDatabase(strDBPath)

            'check to see if the table is present in dbLink
            strTbl = fParseTable(collTbls(i))
            If fIsRemoteTable(dbLink, strTbl) Then
                'everything's ok, reconnect
                Set tdfLocal = dbCurr.TableDefs(strTbl)
                With tdfLocal
                    .Connect = ";Database=" & strDBPath
                    collTbls.Remove (.Name)
                End With
                Err.Raise cERR_NOREMOTETABLE
            End If
        End If
    fRefreshLinks = True
    varRet = SysCmd(acSysCmdClearStatus)
    MsgBox "All Access tables were successfully reconnected.", _
            vbInformation + vbOKOnly, _

    Set collTbls = Nothing
    Set tdfLocal = Nothing
    Set dbLink = Nothing
    Set dbCurr = Nothing
    Exit Function
    fRefreshLinks = False
    Select Case Err
        Case 3059:

        Case cERR_USERCANCEL:
            Dim dbfile As String
            dbfile = fGetLinkPath("staff")
            If IsFileExist(dbfile) Then
                'MsgBox "connected"
                MsgBox "No Database was specified, couldn't link tables.", _
                        vbCritical + vbOKOnly, _
                        "Error in refreshing links."
            End If
            Resume fRefreshLinks_End
            MsgBox "Table '" & strTbl & "' was not found in the database" & _
                    vbCrLf & dbLink.Name & ". Couldn't refresh links", _
                    vbCritical + vbOKOnly, _
                    "Error in refreshing links."
            Resume fRefreshLinks_End
        Case Else:
            strMsg = "Error Information..." & vbCrLf & vbCrLf
            strMsg = strMsg & "Function: fRefreshLinks" & vbCrLf
            strMsg = strMsg & "Description: " & Err.Description & vbCrLf
            strMsg = strMsg & "Error #: " & Format$(Err.Number) & vbCrLf
            MsgBox strMsg, vbOKOnly + vbCritical, "Error"
            Resume fRefreshLinks_End
    End Select
End Function

Function fIsRemoteTable(dbRemote As Database, strTbl As String) As Boolean
Dim tdf As TableDef
    On Error Resume Next
    Set tdf = dbRemote.TableDefs(strTbl)
    fIsRemoteTable = (Err = 0)
    Set tdf = Nothing
End Function

Function fGetMDBName(strIn As String) As String
'Calls GetOpenFileName dialog
Dim strFilter As String

    strFilter = ahtAddFilterItem(strFilter, _
                    "Access Database(*.mdb;*.mda;*.mde;*.mdw) ", _
                    "*.mdb; *.mda; *.mde; *.mdw")
    strFilter = ahtAddFilterItem(strFilter, _
                    "All Files (*.*)", _

    fGetMDBName = ahtCommonFileOpenSave(Filter:=strFilter, _
                                OpenFile:=True, _
                                DialogTitle:=strIn, _
End Function

Function fGetLinkedTables() As Collection
'Returns all linked tables
    Dim collTables As New Collection
    Dim tdf As TableDef, db As Database
    Set db = CurrentDb
    For Each tdf In db.TableDefs
        With tdf
            If Len(.Connect) > 0 Then
                If Left$(.Connect, 4) = "ODBC" Then
                '    collTables.Add Item:=.Name & ";" & .Connect, KEY:=.Name
                'ODBC Reconnect handled separately
                    collTables.Add Item:=.Name & .Connect, Key:=.Name
                End If
            End If
        End With
    Set fGetLinkedTables = collTables
    Set collTables = Nothing
    Set tdf = Nothing
    Set db = Nothing
End Function

Function fParsePath(strIn As String) As String
    If Left$(strIn, 4) <> "ODBC" Then
        fParsePath = Right(strIn, Len(strIn) _
                        - (InStr(1, strIn, "DATABASE=") + 8))
        fParsePath = strIn
    End If
End Function

Function fParseTable(strIn As String) As String
    fParseTable = Left$(strIn, InStr(1, strIn, ";") - 1)
End Function
'***************** Code End ***************

Function TestIt()
    Dim strFilter As String
    Dim lngFlags As Long
    strFilter = ahtAddFilterItem(strFilter, "Access Files (*.mda, *.mdb)", _
    strFilter = ahtAddFilterItem(strFilter, "dBASE Files (*.dbf)", "*.DBF")
    strFilter = ahtAddFilterItem(strFilter, "Text Files (*.txt)", "*.TXT")
    strFilter = ahtAddFilterItem(strFilter, "All Files (*.*)", "*.*")

    ' Uncomment this line to try the example
    ' allowing multiple file names:

    Dim result As Variant

    result = ahtCommonFileOpenSave(InitialDir:="C:\", _
        Filter:=strFilter, FilterIndex:=3, Flags:=lngFlags, _
        DialogTitle:="Hello! Open Me!")

    If lngFlags And ahtOFN_ALLOWMULTISELECT Then
        If IsArray(result) Then
            Dim i As Integer
            For i = 0 To UBound(result)
                MsgBox result(i)
            Next i
            MsgBox result
        End If
        MsgBox result
    End If

    ' Since you passed in a variable for lngFlags,
    ' the function places the output flags value in the variable.
    Debug.Print Hex(lngFlags)
End Function

Function GetOpenFile(Optional varDirectory As Variant, _
    Optional varTitleForDialog As Variant) As Variant

    ' Here's an example that gets an Access database name.
    Dim strFilter As String
    Dim lngFlags As Long
    Dim varFileName As Variant

    ' Specify that the chosen file must already exist,
    ' don't change directories when you're done
    ' Also, don't bother displaying
    ' the read-only box. It'll only confuse people.
    lngFlags = ahtOFN_FILEMUSTEXIST Or _
    If IsMissing(varDirectory) Then
        varDirectory = ""
    End If
    If IsMissing(varTitleForDialog) Then
        varTitleForDialog = ""
    End If

    ' Define the filter string and allocate space in the "c"
    ' string Duplicate this line with changes as necessary for
    ' more file templates.
    strFilter = ahtAddFilterItem(strFilter, _
                "Access (*.mdb)", "*.MDB;*.MDA")

    ' Now actually call to get the file name.
    varFileName = ahtCommonFileOpenSave( _
                    OpenFile:=True, _
                    InitialDir:=varDirectory, _
                    Filter:=strFilter, _
                    Flags:=lngFlags, _
    If Not IsNull(varFileName) Then
        varFileName = TrimNull(varFileName)
    End If
    GetOpenFile = varFileName
End Function

Function ahtCommonFileOpenSave( _
            Optional ByRef Flags As Variant, _
            Optional ByVal InitialDir As Variant, _
            Optional ByVal Filter As Variant, _
            Optional ByVal FilterIndex As Variant, _
            Optional ByVal DefaultExt As Variant, _
            Optional ByVal FileName As Variant, _
            Optional ByVal DialogTitle As Variant, _
            Optional ByVal hwnd As Variant, _
            Optional ByVal OpenFile As Variant) As Variant

    ' This is the entry point you'll use to call the common
    ' file open/save dialog. The parameters are listed
    ' below, and all are optional.
    ' In:
    ' Flags: one or more of the ahtOFN_* constants, OR'd together.
    ' InitialDir: the directory in which to first look
    ' Filter: a set of file filters, set up by calling
    ' AddFilterItem. See examples.
    ' FilterIndex: 1-based integer indicating which filter
    ' set to use, by default (1 if unspecified)
    ' DefaultExt: Extension to use if the user doesn't enter one.
    ' Only useful on file saves.
    ' FileName: Default value for the file name text box.
    ' DialogTitle: Title for the dialog.
    ' hWnd: parent window handle
    ' OpenFile: Boolean(True=Open File/False=Save As)
    ' Out:
    ' Return Value: Either Null or the selected filename
    Dim strFileName As String
    Dim strFileTitle As String
    Dim fResult As Boolean

    ' Give the dialog a caption title.
    If IsMissing(InitialDir) Then InitialDir = CurDir
    If IsMissing(Filter) Then Filter = ""
    If IsMissing(FilterIndex) Then FilterIndex = 1
    If IsMissing(Flags) Then Flags = 0&
    If IsMissing(DefaultExt) Then DefaultExt = ""
    If IsMissing(FileName) Then FileName = ""
    If IsMissing(DialogTitle) Then DialogTitle = ""
    If IsMissing(hwnd) Then hwnd = Application.hWndAccessApp
    If IsMissing(OpenFile) Then OpenFile = True
    ' Allocate string space for the returned strings.
    strFileName = Left(FileName & String(256, 0), 256)
    strFileTitle = String(256, 0)
    ' Set up the data structure before you call the function
    With OFN
        .lStructSize = Len(OFN)
        .hwndOwner = hwnd
        .strFilter = Filter
        .nFilterIndex = FilterIndex
        .strFile = strFileName
        .nMaxFile = Len(strFileName)
        .strFileTitle = strFileTitle
        .nMaxFileTitle = Len(strFileTitle)
        .strTitle = DialogTitle
        .Flags = Flags
        .strDefExt = DefaultExt
        .strInitialDir = InitialDir
        ' Didn't think most people would want to deal with
        ' these options.
        .hInstance = 0
        '.strCustomFilter = ""
        '.nMaxCustFilter = 0
        .lpfnHook = 0
        'New for NT 4.0
        .strCustomFilter = String(255, 0)
        .nMaxCustFilter = 255
    End With
    ' This will pass the desired data structure to the
    ' Windows API, which will in turn it uses to display
    ' the Open/Save As Dialog.
    If OpenFile Then
        fResult = aht_apiGetOpenFileName(OFN)
        fResult = aht_apiGetSaveFileName(OFN)
    End If

    ' The function call filled in the strFileTitle member
    ' of the structure. You'll have to write special code
    ' to retrieve that if you're interested.
    If fResult Then
        ' You might care to check the Flags member of the
        ' structure to get information about the chosen file.
        ' In this example, if you bothered to pass in a
        ' value for Flags, we'll fill it in with the outgoing
        ' Flags value.
        If Not IsMissing(Flags) Then Flags = OFN.Flags
        If Flags And ahtOFN_ALLOWMULTISELECT Then
            ' Return the full array.
            Dim items As Variant
            Dim value As String
            value = OFN.strFile
            ' Get rid of empty items:
            Dim i As Integer
            For i = Len(value) To 1 Step -1
              If Mid$(value, i, 1) <> Chr$(0) Then
                Exit For
              End If
            Next i
            value = Mid(value, 1, i)

            ' Break the list up at null characters:
            items = Split(value, Chr(0))

            ' Loop through the items in the "array",
            ' and build full file names:
            Dim numItems As Integer
            Dim result() As String

            numItems = UBound(items) + 1
            If numItems > 1 Then
                ReDim result(0 To numItems - 2)
                For i = 1 To numItems - 1
                    result(i - 1) = FixPath(items(0)) & items(i)
                Next i
                ahtCommonFileOpenSave = result
                ' If you only select a single item,
                ' Windows just places it in item 0.
                ahtCommonFileOpenSave = items(0)
            End If
            ahtCommonFileOpenSave = TrimNull(OFN.strFile)
        End If
        ahtCommonFileOpenSave = vbNullString
    End If
End Function

Function ahtAddFilterItem(strFilter As String, _
    strDescription As String, Optional varItem As Variant) As String

    ' Tack a new chunk onto the file filter.
    ' That is, take the old value, stick onto it the description,
    ' (like "Databases"), a null character, the skeleton
    ' (like "*.mdb;*.mda") and a final null character.

    If IsMissing(varItem) Then varItem = "*.*"
    ahtAddFilterItem = strFilter & _
                strDescription & vbNullChar & _
                varItem & vbNullChar
End Function

Private Function TrimNull(ByVal strItem As String) As String
    Dim intPos As Integer

    intPos = InStr(strItem, vbNullChar)
    If intPos > 0 Then
        TrimNull = Left(strItem, intPos - 1)
        TrimNull = strItem
    End If
End Function

Private Function FixPath(ByVal path As String) As String
    If Right$(path, 1) <> "\" Then
        FixPath = path & "\"
        FixPath = path
    End If
End Function

'************** Code End *****************

Function fGetLinkPath(strTable As String) As String
Dim dbs As Database, stPath As String

    Set dbs = CurrentDb()
    On Error Resume Next
    stPath = dbs.TableDefs(strTable).Connect
    If stPath = "" Then
        fGetLinkPath = vbNullString
        'can change this to
        fGetLinkPath = Right(stPath, Len(stPath) _
                        - (InStr(1, stPath, "DATABASE=") + 8))
    End If
    Set dbs = Nothing
End Function

Sub sListPath()
    Dim loTd As TableDef
    For Each loTd In CurrentDb.TableDefs
        Debug.Print fGetLinkPath(loTd.Name)
    Next loTd
    Set loTd = Nothing
End Sub
Public Function IsFileExist(strPath) As Boolean
         If Len(Dir$(strPath)) > 0 Then
            IsFileExist = True
            IsFileExist = False
         End If
End Function

No comments: