Jeg har selv fundet svarene på mine spørgsmål:
Ændring af standarddatabasemappe, se:
http://www.eksperten.dk/spm/75356Opdatering af sammenkædede tabeller. Jeg fandt følgende modul i Northwind databasen til Access2000
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' RefreshTableLinks '
' '
' This module contains functions that refresh the '
' links to Northwind tables if they aren't available. '
' '
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Option Explicit ' Require variables to be declared before being used.
Option Compare Database ' Use database order for string comparisons.
Declare Function GetOpenFileName Lib "comdlg32.dll" Alias _
"GetOpenFileNameA" (pOpenfilename As OPENFILENAME) As Boolean
Declare Function GetSaveFileName Lib "comdlg32.dll" Alias _
"GetSaveFileNameA" (pOpenfilename As OPENFILENAME) As Boolean
Type MSA_OPENFILENAME
' Filter string used for the Open dialog filters.
' Use MSA_CreateFilterString() to create this.
' Default = All Files, *.*
strFilter As String
' Initial Filter to display.
' Default = 1.
lngFilterIndex As Long
' Initial directory for the dialog to open in.
' Default = Current working directory.
strInitialDir As String
' Initial file name to populate the dialog with.
' Default = "".
strInitialFile As String
strDialogTitle As String
' Default extension to append to file if user didn't specify one.
' Default = System Values (Open File, Save File).
strDefaultExtension As String
' Flags (see constant list) to be used.
' Default = no flags.
lngFlags As Long
' Full path of file picked. When the File Open dialog box is
' presented, if the user picks a nonexistent file,
' only the text in the "File Name" box is returned.
strFullPathReturned As String
' File name of file picked.
strFileNameReturned As String
' Offset in full path (strFullPathReturned) where the file name
' (strFileNameReturned) begins.
intFileOffset As Integer
' Offset in full path (strFullPathReturned) where the file extension begins.
intFileExtension As Integer
End Type
Const ALLFILES = "All Files"
Type OPENFILENAME
lStructSize As Long
hwndOwner As Long
hInstance As Long
lpstrFilter As String
lpstrCustomFilter As Long
nMaxCustrFilter As Long
nFilterIndex As Long
lpstrFile As String
nMaxFile As Long
lpstrFileTitle As String
nMaxFileTitle As Long
lpstrInitialDir As String
lpstrTitle As String
Flags As Long
nFileOffset As Integer
nFileExtension As Integer
lpstrDefExt As String
lCustrData As Long
lpfnHook As Long
lpTemplateName As Long
End Type
Const OFN_ALLOWMULTISELECT = &H200
Const OFN_CREATEPROMPT = &H2000
Const OFN_EXPLORER = &H80000
Const OFN_FILEMUSTEXIST = &H1000
Const OFN_HIDEREADONLY = &H4
Const OFN_NOCHANGEDIR = &H8
Const OFN_NODEREFERENCELINKS = &H100000
Const OFN_NONETWORKBUTTON = &H20000
Const OFN_NOREADONLYRETURN = &H8000
Const OFN_NOVALIDATE = &H100
Const OFN_OVERWRITEPROMPT = &H2
Const OFN_PATHMUSTEXIST = &H800
Const OFN_READONLY = &H1
Const OFN_SHOWHELP = &H10
Function FindNorthwind(strSearchPath) As String
' Displays the Open dialog box for the user to locate
' the Northwind database. Returns the full path to Northwind.
Dim msaof As MSA_OPENFILENAME
' Set options for the dialog box.
msaof.strDialogTitle = "Where is the NorthWind data file?"
msaof.strInitialDir = strSearchPath
msaof.strFilter = MSA_CreateFilterString("Databases", "*.mdb")
' Call the Open dialog routine.
MSA_GetOpenFileName msaof
' Return the path and file name.
FindNorthwind = Trim(msaof.strFullPathReturned)
End Function
Function MSA_CreateFilterString(ParamArray varFilt() As Variant) As String
' Creates a filter string from the passed in arguments.
' Returns "" if no argumentss are passed in.
' Expects an even number of argumentss (filter name, extension), but
' if an odd number is passed in, it appends "*.*".
Dim strFilter As String
Dim intRet As Integer
Dim intNum As Integer
intNum = UBound(varFilt)
If (intNum <> -1) Then
For intRet = 0 To intNum
strFilter = strFilter & varFilt(intRet) & vbNullChar
Next
If intNum Mod 2 = 0 Then
strFilter = strFilter & "*.*" & vbNullChar
End If
strFilter = strFilter & vbNullChar
Else
strFilter = ""
End If
MSA_CreateFilterString = strFilter
End Function
Function MSA_ConvertFilterString(strFilterIn As String) As String
' Creates a filter string from a bar ("|") separated string.
' The string should pairs of filter|extension strings, i.e. "Access Databases|*.mdb|All Files|*.*"
' If no extensions exists for the last filter pair, *.* is added.
' This code will ignore any empty strings, i.e. "||" pairs.
' Returns "" if the strings passed in is empty.
Dim strFilter As String
Dim intNum As Integer, intPos As Integer, intLastPos As Integer
strFilter = ""
intNum = 0
intPos = 1
intLastPos = 1
' Add strings as long as we find bars.
' Ignore any empty strings (not allowed).
Do
intPos = InStr(intLastPos, strFilterIn, "|")
If (intPos > intLastPos) Then
strFilter = strFilter & Mid(strFilterIn, intLastPos, intPos - intLastPos) & vbNullChar
intNum = intNum + 1
intLastPos = intPos + 1
ElseIf (intPos = intLastPos) Then
intLastPos = intPos + 1
End If
Loop Until (intPos = 0)
' Get last string if it exists (assuming strFilterIn was not bar terminated).
intPos = Len(strFilterIn)
If (intPos >= intLastPos) Then
strFilter = strFilter & Mid(strFilterIn, intLastPos, intPos - intLastPos + 1) & vbNullChar
intNum = intNum + 1
End If
' Add *.* if there's no extension for the last string.
If intNum Mod 2 = 1 Then
strFilter = strFilter & "*.*" & vbNullChar
End If
' Add terminating NULL if we have any filter.
If strFilter <> "" Then
strFilter = strFilter & vbNullChar
End If
MSA_ConvertFilterString = strFilter
End Function
Private Function MSA_GetSaveFileName(msaof As MSA_OPENFILENAME) As Integer
' Opens the file save dialog.
Dim of As OPENFILENAME
Dim intRet As Integer
MSAOF_to_OF msaof, of
of.Flags = of.Flags Or OFN_HIDEREADONLY
intRet = GetSaveFileName(of)
If intRet Then
OF_to_MSAOF of, msaof
End If
MSA_GetSaveFileName = intRet
End Function
Function MSA_SimpleGetSaveFileName() As String
' Opens the file save dialog with default values.
Dim msaof As MSA_OPENFILENAME
Dim intRet As Integer
Dim strRet As String
intRet = MSA_GetSaveFileName(msaof)
If intRet Then
strRet = msaof.strFullPathReturned
End If
MSA_SimpleGetSaveFileName = strRet
End Function
Private Function MSA_GetOpenFileName(msaof As MSA_OPENFILENAME) As Integer
' Opens the Open dialog.
Dim of As OPENFILENAME
Dim intRet As Integer
MSAOF_to_OF msaof, of
intRet = GetOpenFileName(of)
If intRet Then
OF_to_MSAOF of, msaof
End If
MSA_GetOpenFileName = intRet
End Function
Function MSA_SimpleGetOpenFileName() As String
' Opens the Open dialog with default values.
Dim msaof As MSA_OPENFILENAME
Dim intRet As Integer
Dim strRet As String
intRet = MSA_GetOpenFileName(msaof)
If intRet Then
strRet = msaof.strFullPathReturned
End If
MSA_SimpleGetOpenFileName = strRet
End Function
Public Function CheckLinks() As Boolean
' Check links to the Northwind database; returns True if links are OK.
Dim dbs As DAO.database, rst As DAO.Recordset
Set dbs = CurrentDb
' Open linked table to see if connection information is correct.
On Error Resume Next
Set rst = dbs.OpenRecordset("t_NorthWind")
' If there's no error, return True.
If Err = 0 Then
CheckLinks = True
Else
CheckLinks = False
End If
End Function
Private Sub OF_to_MSAOF(of As OPENFILENAME, msaof As MSA_OPENFILENAME)
' This sub converts from the Win32 structure to the Microsoft Access structure.
msaof.strFullPathReturned = Left(of.lpstrFile, InStr(of.lpstrFile, vbNullChar) - 1)
msaof.strFileNameReturned = of.lpstrFileTitle
msaof.intFileOffset = of.nFileOffset
msaof.intFileExtension = of.nFileExtension
End Sub
Private Sub MSAOF_to_OF(msaof As MSA_OPENFILENAME, of As OPENFILENAME)
' This sub converts from the Microsoft Access structure to the Win32 structure.
Dim strFile As String * 512
' Initialize some parts of the structure.
of.hwndOwner = Application.hWndAccessApp
of.hInstance = 0
of.lpstrCustomFilter = 0
of.nMaxCustrFilter = 0
of.lpfnHook = 0
of.lpTemplateName = 0
of.lCustrData = 0
If msaof.strFilter = "" Then
of.lpstrFilter = MSA_CreateFilterString(ALLFILES)
Else
of.lpstrFilter = msaof.strFilter
End If
of.nFilterIndex = msaof.lngFilterIndex
of.lpstrFile = msaof.strInitialFile _
& String(512 - Len(msaof.strInitialFile), 0)
of.nMaxFile = 511
of.lpstrFileTitle = String(512, 0)
of.nMaxFileTitle = 511
of.lpstrTitle = msaof.strDialogTitle
of.lpstrInitialDir = msaof.strInitialDir
of.lpstrDefExt = msaof.strDefaultExtension
of.Flags = msaof.lngFlags
of.lStructSize = Len(of)
End Sub
Private Function Refreshlinks(strFileName As String) As Boolean
' Refresh links to the supplied database. Return True if successful.
Dim dbs As DAO.database
Dim tdf As DAO.TableDef
' Loop through all tables in the database.
Set dbs = CurrentDb
For Each tdf In dbs.TableDefs
' If the table has a connect string, it's a linked table.
If Len(tdf.Connect) > 0 Then
tdf.Connect = ";DATABASE=" & strFileName
Err = 0
On Error Resume Next
tdf.RefreshLink ' Relink the table.
If Err <> 0 Then
Refreshlinks = False
Exit Function
End If
End If
Next tdf
Refreshlinks = True ' Relinking complete.
End Function
Public Function RelinkTables() As Boolean
' Tries to refresh the links to the Northwind database.
' Returns True if successful.
Dim strAccDir As String
Dim strSearchPath As String
Dim strFileName As String
Dim intError As Integer
Dim strError As String
Const conMaxTables = 8
Const conNonExistentTable = 3011
Const conNotNorthwind = 3078
Const conNwindNotFound = 3024
Const conAccessDenied = 3051
Const conReadOnlyDatabase = 3027
Const conAppTitle = "The NorthWind Database"
' Get name of directory where MSAccess.exe is located.
strAccDir = SysCmd(acSysCmdAccessDir)
' Get the default sample database path.
strSearchPath = strAccDir
' Look for the Northwind database.
If (Dir(strSearchPath & "NorthWind_be.mdb") <> "") Then
strFileName = strSearchPath & "NorthWind_be.mdb"
Else
' Can't find Northwind, so display the Open dialog box.
MsgBox "You must find the file NorthWind_be.mdb, " _
& "Which contains data for " _
& conAppTitle & ".", vbExclamation
strFileName = FindNorthwind(strSearchPath)
If strFileName = "" Then
strError = "Sorry, the datafile must be found before you can use" & conAppTitle & "."
GoTo Exit_Failed
End If
End If
' Fix the links.
If Refreshlinks(strFileName) Then
RelinkTables = True
Exit Function
End If
' If it failed, display an error.
Select Case Err
Case conNonExistentTable, conNotNorthwind
strError = "The file '" & strFileName & "' is not the data file for " & conAppTitle & "."
Case Err = conNwindNotFound
strError = "You cannot use" & conAppTitle & " before your find NorthWind_be.mdb."
Case Err = conAccessDenied
strError = "Could not open" & strFileName & " because it is read-only or because it is placed in a dierctory which is read-only."
Case Err = conReadOnlyDatabase
strError = "Cannot relink the tables because " & conAppTitle & " or the programme is placed in a directory whic is read-only."
Case Else
strError = Err.Description
End Select
Exit_Failed:
MsgBox strError, vbCritical
RelinkTables = False
End Function
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