如何在VB中备份及恢复SQL数据库，用SQL当后台数据库（请高手给出代码，谢谢！）

------------------------------------------------------------------
' 代码描述：SQL Server数据库的备份与恢复
'
' 注意事项：1.需要在工程中引用Microsoft SQLDMO Object Library
'           2.备份/恢复数据库时，要保证没有其它用户连接到SQL Server
'
' 窗体控件：2个Command，名称分别为cmdBackup,cmdRestore
'           1个Label,名称为lblProgress,用于显示备份/恢复进程。'------------------------------------------------------------------
'
Option ExplicitPrivate WithEvents objBackup As SQLDMO.Backup
Private WithEvents objRestore As SQLDMO.RestorePrivate Sub cmdBackup_Click()
    Dim objSQLServer As New SQLDMO.SQLServer
    Dim strServer As String
    Dim strUserID As String
    Dim strPassword As String
    Dim strDatabase As String
    Dim strFile As String

    strServer = "Developer"
    strUserID = "SA"
    strPassword = ""
    strDatabase = "Test"
    strFile = "c:\test.bak"

    If Dir(strFile) <> "" Then
        If MsgBox("文件" & strFile & "已存在，是否删除？", vbQuestion + vbYesNo) = vbYes Then
            Kill strFile
        Else
            Exit Sub
        End If
    End If

    lblProgress.Caption = "备份进度： 0%"
    Screen.MousePointer = 11

    On Error GoTo ErrorHandler

    objSQLServer.Connect strServer, strUserID, strPassword

    Set objBackup = New SQLDMO.Backup
    With objBackup
        .PercentCompleteNotification = 1
        .Database = strDatabase
        .Files = strFile
        .SQLBackup objSQLServer
    End With
    Set objBackup = Nothing

    objSQLServer.Close
    Set objSQLServer = Nothing

    Screen.MousePointer = 0
    Exit Sub

ErrorHandler:
    Screen.MousePointer = 0
    MsgBox Err.Description, vbCritical
End SubPrivate Sub cmdRestore_Click()
    Dim objSQLServer As New SQLDMO.SQLServer
    Dim strServer As String
    Dim strUserID As String
    Dim strPassword As String
    Dim strDatabase As String
    Dim strFile As String

    strServer = "Developer"
    strUserID = "SA"
    strPassword = ""
    strDatabase = "Test"
    strFile = "c:\test.bak"

    If Dir(strFile) = "" Then
        MsgBox "文件" & strFile & "不存在！", vbExclamation
        Exit Sub
    End If

    lblProgress.Caption = "恢复进度： 0%"
    Screen.MousePointer = 11

    On Error GoTo ErrorHandler

    objSQLServer.Connect strServer, strUserID, strPassword

    Set objRestore = New SQLDMO.Restore
    With objRestore
        .PercentCompleteNotification = 1
        .Database = strDatabase
        .ReplaceDatabase = True
        .Files = strFile
        .SQLRestore objSQLServer
    End With
    Set objRestore = Nothing

    objSQLServer.Close
    Set objSQLServer = Nothing

    Screen.MousePointer = 0
    Exit Sub

ErrorHandler:
    Screen.MousePointer = 0
    MsgBox Err.Description, vbCritical
End SubPrivate Sub objBackup_Complete(ByVal Message As String)
    lblProgress.Caption = "备份成功！"
    Set objBackup = Nothing
End SubPrivate Sub objBackup_PercentComplete(ByVal Message As String, ByVal Percent As Long)
    lblProgress.Caption = "备份进度： " & Percent & "%"
    DoEvents
End SubPrivate Sub objRestore_Complete(ByVal Message As String)
    lblProgress.Caption = "恢复成功！"
    Set objRestore = Nothing
End SubPrivate Sub objRestore_PercentComplete(ByVal Message As String, ByVal Percent As Long)
    lblProgress.Caption = "恢复进度： " & Percent & "%"
    DoEvents
End Sub'备份数据库'需要添加一个commoldialog控件
Sub backDataBase()
    On Error GoTo errnum
    dlg.CancelError = True
    Cn1.Execute "use master"
    dlg.Filter = "(*.bak)|*.bak"
    dlg.ShowSave
    MousePointer = 11
    Cn1.Execute "BACKUP DATABASE kffgl TO DISK = '" & dlg.FileName & "'"  '备份数据库
    MousePointer = 0
    Set Cn1 = Nothing
    '重新建立连接
errnum:


    Call dbint
    Set Cn1 = New ADODB.Connection
    Cn1.Open "Driver={SQL Server};Server=" & SQL_SRV & ";Uid=" & SA & ";Pwd=" & PA & ";Database=" & SJK & ""
End Sub用SQLDMO实现备份
添加进度条ProgressBar1控件
引用Microsoft  SQLDMO  Object  Library

'声明
Public  WithEvents  bkps  As  SQLDMO.Backup
'数据库备份操作
Private  Sub  Command3_Click()
       Dim  oSvr  As  SQLDMO.SQLServer
       Set  oSQLServer  =  CreateObject("SQLDMO.SQLServer")
       oSQLServer.LoginSecure  =  False
       oSQLServer.Connect  ("(local)"),  ("sa"),  ("")'连接服务器
       Screen.MousePointer  =  11
       Set  bkps  =  CreateObject("SQLDMO.Backup")
       bkps.Database  =  "db"'指定需备份的数据库
       bkps.Action  =  0
       bkps.Files  =  "c:\backup\db.bak"'指定备份文件
       bkps.Initialize  =  True
       ProgressBar1.Value  =  0
       ProgressBar1.max  =  100
       Screen.MousePointer  =  0
       DoEvents
       Err  =  0
       bkps.SQLBackup  oSQLServer
       Screen.MousePointer  =  11
       ProgressBar1.Value  =  100
       DoEvents
       Set  bkps  =  Nothing
       Screen.MousePointer  =  0
       MsgBox  "数据库备份完成"
End  Sub
'显示进度
Private  Sub  bkps_PercentComplete(ByVal  Message  As  String,  ByVal  Percent  As  Long)
       ProgressBar1.Value  =  ProgressBar1.max  *  (Percent  /  100)
End  Sub

备份时ProgressBar1显示进度，恢复操作方法相同。

*********************************************************
'* 名称：BackupDatabase
'* 功能：备份数据库
'* 控件：一个文本框和两个按钮（备份到和确定）
'*********************************************************
Public Sub BackupDatabase()
Dim cn As New ADODB.Connection
Dim s_path, s_dataexport As String
s_path = App.Path
Me.MousePointer = 11   '设置鼠标指针形状
'student1是需要备份的数据库名称
s_dataexport = "backup database student1 to disk='" + CommonDialog1.FileName + "'"
cn.Open "driver={sql server};server=" & d1 & ";database=student1;persist security info=false; userid=sa"  '数据库连接字符串
'这里不需要连接master数据库，即可完成备份
cn.BeginTrans
cn.Execute s_dataexport
Err.Number = 0
If Err.Number = 0 Then
    cn.CommitTrans
    MsgBox "数据备份成功！", vbInformation, "提示"
    MsgBox "数据备份文件存放路径:" & CommonDialog1.FileName, vbOKOnly, "提示"
    Unload Me
Else
    cn.RollbackTrans
    MsgBox "数据备份失败！请检查数据库是否正在打开！", vbCritical, "提示"
End If
cn.Close
Set cn = Nothing
Me.MousePointer = 1
End Sub'*********************************************************
'* 名称：RestoreDataBase
'* 功能：还原数据库
'* 控件：一个文本框和两个按钮（打开和确定）
'*********************************************************
Public Sub RestoreDataBase()
If Text1.Text = "" Then
    MsgBox "请选择要恢复的数据文件！", vbInformation, "提示"
    Exit Sub
Else
    ret = MsgBox("数据恢复操作将会覆盖以前的所有数据并且覆盖后无法恢复，您确定要进行恢复操作吗？", vbQuestion + vbOKCancel, "提示")
    If ret = vbOK Then
       Dim cn As New ADODB.Connection
       Dim sn As New ADODB.Recordset
       Dim s_restore As String
       Me.MousePointer = 11
       cn.Open "Provider=SQLOLEDB.1;Persist Security Info=False;server=" & d1 & ";Initial Catalog=master;Data Source=127.0.0.1;user id=sa;password=" & d3 & ""
       sn.Open "select  spid  from  sysprocesses  where  dbid=db_id('student1')", cn
        Do While Not sn.EOF
          cn.Execute "kill " & sn("spid")
          sn.MoveNext
        Loop
        sn.Close
        s_restore = "restore database student1 from disk='" + Trim(Text1.Text) + "'  with REPLACE"
        cn.Execute s_restore
         'Debug.Print gs_conn_string
         '此时需要连接master数据库才能完成数据恢复操作
         '同上student1为需要恢复的数据库
        s_restore = "restore database student1 from disk='" + Trim(Text1.Text) + "'"
         'text1一个用于记录需要恢复文件的地址的textbox
        cn.Execute s_restore
        cn.BeginTrans
        If Err.Number = 0 Then
            cn.CommitTrans
            MsgBox "数据恢复成功！", vbInformation, "提示"
            Command1.Enabled = True
            Label1.Visible = False
        Else
            cn.RollbackTrans
            MsgBox "数据恢复失败！", vbCritical, "提示"
            Command1.Enabled = True
        End If
        cn.Close
        Set cn = Nothing
        Me.MousePointer = 1
    Else
        Exit Sub
    End If                      '''''''''''''''''''''''''''''''''''''''''
    On Error Resume Next
    Dim DBC As New DataBaseConnection
    If db.State = 1 Then
       db.Close
    End If
    db.ConnectionString = DBC.SqlConnectString(d1, d2, d3)
    rs.CursorType = adOpenDynamic
    rs.CursorLocation = adUseClient
    rs.LockType = adLockOptimistic
    db.CursorLocation = adUseClient
    db.Open
    Set cmd.ActiveConnection = db
    If Err.Number Then
       MsgBox Err.Description, 16 + vbOKOnly, Err.Number
       Exit Sub
    End If
    db.DefaultDatabase = "student1"
    If Err.Number Then
       MsgBox Err.Description, 16 + vbOKOnly, Err.Number
       Exit Sub
    End If
End If
End Sub                      '''''''''''''''''''''''''''''''''''''''''''''如果当前没有与要恢复的数据库立连接，则不需要加单引号中的内容。如果希望恢复数据库之后继续建立连接，则需要写这部分代码。我要恢复数据库名称为student1，备份数据库的时候是在连接状态下进行的，但是恢复数据库不可以在数据库存在连接的状态下进行操作！代码的解决方法是：先连接SQL Server中主库master 库，在该库中的sysprocesses表中存放着所有连接到此数据库的连接信息，将这些连接信息用Kill语句删除。然后再恢复数据库student1，由于用Kill语句后，数据库已经被断开，所以在恢复完成后，再用系统最初的连接数据库代码连接上数据库student1。

数据库备份/恢复方案
http://expert.csdn.net/Expert/topic/2359/2359124.xml?temp=.3535425

yoki(小马哥）：
在数据恢复的时候，显示数据库正在使用，我的其他代码通过ODBC连接，是不是与ODBC有关，请解决该问题。谢谢。

如何创建数据库备份 (Transact-SQL)
创建数据库备份执行 BACKUP DATABASE 语句以创建数据库备份，同时指定：
要备份的数据库的名称。
数据库备份将写入的备份设备。
指定（可选）：
INIT 子句，通过它可以重写备份媒体，并在备份媒体上将该备份作为第一个文件写入。如果没有现成的媒体头，备份过程将自动写入一个。
SKIP 和 INIT 子句，通过它们可以在备份媒体中仍然存在未失效的备份，或在媒体本身的名称与备份媒体中的名称不匹配时重写备份媒体。
FORMAT 子句，通过它可以在第一次使用媒体时对备份媒体进行完全初始化，并覆盖任何现有的媒体头。
如果已经指定了 FORMAT 子句，则不需要指定 INIT 子句。

重要  当使用 BACKUP 语句的 FORMAT 子句或 INIT 子句时，一定要十分小心，因为它们会破坏以前存储在备份媒体中的所有备份。
示例
下例将整个 MyNwind 数据库备份到磁带上：USE MyNwind
GO
BACKUP DATABASE MyNwind
   TO TAPE = '\\.\Tape0'
   WITH FORMAT,
   NAME = 'Full Backup of MyNwind'
GO
如何还原数据库备份 (Transact-SQL)
还原数据库备份

重要  还原数据库备份的系统管理员必须是唯一一位当前使用要还原的数据库的人。执行 RESTORE DATABASE 语句以还原数据库备份，同时指定：
要还原的数据库名称。
要从其中还原数据库备份的备份设备。
NORECOVERY 子句，如果要在还原数据库备份后应用事务日志或差异数据库备份的话。
指定（可选）：
FILE 子句，以此标识备份设备上要还原的备份集。
示例
下例从磁带还原 MyNwind 数据库备份：USE master
GO
RESTORE DATABASE MyNwind
   FROM TAPE = '\\.\Tape0'
GO

调试易

如何在VB中备份及恢复SQL数据库，用SQL当后台数据库（请高手给出代码，谢谢！）

解决方案 »