尽管Accxp网上有很多关于定位链接表的贴子,但还是有很多的朋友询问这方面的问题。应letter网友的提议,结合Alex总版主的重新定位链接表文件源码,现将这方面的具体操作介绍如下:
假设前台数据库文件名为frontBase.mdb 后台数据库文件名为backData.mdb frontBase当中有链接表tbl1, tbl2, tbl3, …,链接到backData.mdb中
首先我们要在前台数据库文件的启动窗体加载事件中判断链接是否正确
方法是打开任意一个链接表,假设为tbl1,代码如下:
Public Function CheckLinks() As Boolean ' 检查到后台数据库的链接;如果链接存在且正确的话,返回 True 。 Dim dbs As Database, rst As DAO.Recordset Set dbs = CurrentDb() ' 打开链接表查看表链接信息是否正确。 On Error Resume Next Set rst = dbs.OpenRecordset(“tbl1”) rst.Close ' 如果没有错误,返回 True 。 If Err = 0 Then CheckLinks = True Else CheckLinks = False End If End Function
启动窗体的加载事件: Private Sub FORM_Load() If CheckLinks = False then Docmd.OpenFORM “frmConnect” End If End Sub
frmConnect 连接窗体如下图
[img]f:\m.bmp[/img]
接下来的事情就是如何刷新链接表了。 上面的窗体右边的按钮是用用来调用API打开文件对话框,具体代码如下: Declare Function GetOpenFileName Lib "comdlg32.dll" Alias "GetOpenFileNameA" (pOpenfilename As OPENFILENAME) As Boolean
Type OPENFILENAME lStructSize As Long hwndOwner As Long hInstance As Long lpstrFilter As String lpstrCustomFilter As String nMaxCustFilter 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 lCustData As Long lpfnHook As Long lpTemplateName As String End Type
Private Sub FileOpen_Click() Dim ofn As OPENFILENAME Dim rtn As String
ofn.lStructSize = Len(ofn) ofn.hwndOwner = Me.hwnd
ofn.lpstrFilter = "数据库文件 (*.mdb)" & VBNullChar & "*.mdb" ofn.lpstrFile = Space(254) ofn.nMaxFile = 255 ofn.lpstrFileTitle = Space(254) ofn.nMaxFileTitle = 255 ofn.lpstrInitialDir = CurrentProject.Path ofn.lpstrTitle = "后台数据文件为" ofn.flags = 6148
rtn = GetOpenFileName(ofn)
FileName.SetFocus If rtn = True Then FileName.Text = ofn.lpstrFile FileName.Text = FileName.Text OK.Enabled = True Else FileName.Text = "" End If End Sub
连接按钮刷新链接表 ,代码如下: Private Sub OK_Click() Dim tabDef As TableDef For Each tabDef In CurrentDb.TableDefs If Len(tabDef.Connect) > 0 Then tabDef.Connect = ";DATABASE=" & Me.FileName.Text & ";PWD=" + 后台数据库密码 tabDef.RefreshLink End If Next MsgBox "连接成功!" DoCmd.Close acFORM, Me.Name End Sub
其实很简单只有两步,判断链接是否正确和刷新链接表。
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