.pFrom = strSourcePath & vbNullChar
.pTo = strDestinationPath & "\Backup - " & Format(Date, "yyyy.mm.dd") & vbNullChar
.fFlags = lFlags
End With
lresult = SHFileOperation(SHFileOp)
Screen.MousePointer = vbDefault
frmBackupDba.lblStatus = "Backup Complete"
在备份分前先要选择一个备份路径，点击…那个按钮开始进行选择，实现方法如下：
Dim strTemp As String
strTemp = fBrowseForFolder(Me.hwnd, "Select backup path")
If strTemp <> "" Then
txtDestination = strTemp
End If
数据恢复界面同上，它的功能主要是在当前数据库遭到破坏后，可以利用它来进行数据恢复，在数据恢复前要选择所要恢复的数据库路径，如下：
Dim strTemp As String
strTemp = fBrowseForFolder(Me.hwnd, "Restore From")
If strTemp <> "" Then
txtSource = strTemp
dbasize2 = FileLen(txtSource & "\db.MDB")
lblSelectedDba = "Selected Backup Database is : " & Format((dbasize2 / 1024) / 1024, "standard") & "MB."
cmdRestore.Enabled = True
End If
Erro:
Select Case err.Number
Case 53 'File Not Found
lblSelectedDba = "No Backup at this location"
Toolbar2.Enabled = False
End Select
它主要是查看数据库是否存在，如果所恢复的数据不存在，则会提示错误。
数据恢复也用到了一个方法，在模块中也已经定义了该方法DoRestore。数据恢复代码如下：
If MsgBox("Restoring database from location " & txtSource & " will replace existing database files.Do you want to Contunue", vbYesNo) = vbYes Then
DoRestore txtSource.Text, App.Path
If NoDba = True Then
MsgBox "Database Restored Click Ok to Exit Program"
frmRestoreDba.Hide
Unload frmRestoreDba
End If
Else
lblStatus.Caption = "Database Restore Canceled"
End If
其中DoRestore实现的功能源码如下所示：
DEFSOURCE = "PROVIDER=Microsoft.jet.oledb.4.0;Persist Security Info=False;Data Source="
DBName = "\db.MDB;Jet OLEDB:Database Password=matrix-se;"
Set Db = New ADODB.Connection
Db.Open DEFSOURCE & App.Path & DBName
Dim lFileOp As Long
Dim lresult As Long
Dim lFlags As Long
Dim SHFileOp As SHFILEOPSTRUCT
Dim strSourceDir As String
Dim strDestinationDir As String
Db.Close
Screen.MousePointer = vbHourglass
BackupFolderName = strDestinationPath
lFileOp = FO_COPY
lFlags = lFlags And Not FOF_SILENT
lFlags = lFlags Or FOF_NOCONFIRMATION
lFlags = lFlags Or FOF_NOCONFIRMMKDIR
lFlags = lFlags Or FOF_FILESONLY
With SHFileOp
.wFunc = lFileOp
.pFrom = strSourcePath & "\db.MDB" & vbNullChar
.pTo = strDestinationPath & vbNullChar
.fFlags = lFlags
End With
lresult = SHFileOperation(SHFileOp)
Set Db = New ADODB.Connection
Db.Open DEFSOURCE & App.Path & DBName
Screen.MousePointer = vbDefault
frmRestoreDba.lblStatus = "Restore Complete"
说明：本程序中此部分内容参考了网上的同类型代码，对其进行修改后得到此成型作品，从功能上来讲，它已经实现了它所要完成的工作，经过测试已经没有问题，但是实现的源代码，也只有部分掌握。这实属本人精力与能力有限所置。
4.3.4 数据转换
这个功能可以把当前列表框中的任何一个表转换成excel形式，转换后你可以看到表中的内容，也可以对表进行操作，保存，修改，打印等。
①界面效果图
