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access中數(shù)據(jù)表的自動重新聯(lián)接

[摘要]用access做應(yīng)用程序,往往做成"數(shù)據(jù)"和"程序"兩個數(shù)據(jù)庫,"數(shù)據(jù)"數(shù)據(jù)庫中只存放數(shù)據(jù)表,"程序"數(shù)據(jù)庫中存放所有...

  用access做應(yīng)用程序,往往做成"數(shù)據(jù)"和"程序"兩個數(shù)據(jù)庫,"數(shù)據(jù)"數(shù)據(jù)庫中只存放數(shù)據(jù)表,"程序"數(shù)據(jù)庫中存放所有的form,query,report,module等,通過表聯(lián)接"程序"數(shù)據(jù)庫可以訪問所有"數(shù)據(jù)"數(shù)據(jù)庫中的表。

  當(dāng)我們的應(yīng)用程序更換存儲位置的時候往往失去正確的表聯(lián)接,造成運行錯誤。下面的一段程序可以自動找回表聯(lián)接。在我的應(yīng)用中"程序"數(shù)據(jù)庫名字是stockMgr.mdb,"數(shù)據(jù)"數(shù)據(jù)庫名字是stock-Data.mdb

  注意: 該程序僅限于"程序"和"數(shù)據(jù)"存放在同一個目錄而且是對應(yīng)單個"數(shù)據(jù)"文件的情況。

  Function ReAttachTable()

  Dim MyDB As Database, MyTbl As TableDef

  Dim cpath As String

  Dim datafiles As String, i As Integer

  On Error Resume Next

  Set MyDB = CurrentDb

  cpath = trimFileName(CurrentDb.Name)

  datafiles = "stock-data.mdb"

  DoCmd.Hourglass True

  For i = 0 To MyDB.TableDefs.Count - 1

  Set MyTbl = MyDB.TableDefs(i)

  If MyTbl.Attributes = DB_ATTACHEDTABLE And Left(MyTbl.Connect, 1) = ";" Then

  MyTbl.Connect = ";DATABASE=" & cpath & datafiles

  MyTbl.RefreshLink

  If Err Then

  If vbNo = MsgBox(Err.description & ",繼續(xù)嗎?", vbYesNo) Then Exit For

  End If

  End If

  Next i

  DoCmd.Hourglass False

  msgbox "Tables relink finish."

  End Function

  '絕對路徑中去掉文件名,返回路徑

  Function trimFileName(fullname As String) As String

  Dim slen As Long, i As Long

  slen = Len(fullname)

  For i = slen To 1 Step -1

  If Mid(fullname, i, 1) = "" Then

  Exit For

  End If

  Next

  trimFileName = Left(fullname, i)

  End Function

  在程序啟動或者按鈕動作中調(diào)用即可。


Microsoft Access在很多地方得到廣泛使用,例如小型企業(yè),大公司的部門。