進程無法訪問該文件，因爲它正在被另一個進程使用......任何想法？

Question

我用下面的代碼片段複製/備份數據庫

Public Sub backupData() 
     Try 

      Dim s As StreamWriter 

      Dim portfolioPath As String = Environment.CurrentDirectory 
      'MsgBox(Application.UserAppDataPath) 
      If Not Directory.Exists(LIC.My.Settings.BackupDirectory) Then 

       Directory.CreateDirectory(LIC.My.Settings.BackupDirectory) 

       File.Create(LIC.My.Settings.BackupDirectory & "\LIC.Mdf").Close() 

       File.Create(LIC.My.Settings.BackupDirectory & "\Backup log.rtf").Close() 

       s = New StreamWriter(LIC.My.Settings.BackupDirectory & "\Backup log.rtf", True) 

       s.WriteLine("This backup was initially taken on - " & Date.Now) 

       s.Flush() 

       s.Close() 

       FileCopy(portfolioPath & "\LIC.mdf", LIC.My.Settings.BackupDirectory & "\LIC.Mdf") 

       s = New StreamWriter(LIC.My.Settings.BackupDirectory & "\Backup log.rtf", True) 

       MsgBox("New directory and backup file created") 

      Else 
       FileCopy(portfolioPath & "\LIC.mdf", LIC.My.Settings.BackupDirectory & "\LIC.Mdf") 

       s = New StreamWriter(LIC.My.Settings.BackupDirectory & "\Backup log.rtf", True) 

       s.WriteLine("This backup was latest updated on - " & Date.Now) 

       s.Flush() 

       s.Close() 

       MsgBox("Back up completed successfully") 

      End If 



     Catch ex As Exception 

      Dim MessageString As String = "Report this error to the system administrator: " & ControlChars.NewLine & ex.Message 

      Dim TitleString As String = "Data Backup Failed" 

      MessageBox.Show(MessageString, TitleString, MessageBoxButtons.OK, MessageBoxIcon.Error) 

     End Try 
    End Sub 

，但我得到一個錯誤*「該進程無法訪問該文件，因爲它正被另一個進程使用」 *任何想法如何能我複製/備份文件？

Answer 1

除非先關閉SQL Server服務，否則將無法複製該文件。

話雖如此，真的沒有理由使用SQLDMO或上述方法來備份數據庫;它可以用一個簡單的處理SQL命令來完成：

BACKUP DATABASE MyDatabase TO DISK = 'MyDatabase.bak' WITH FORMAT 

這將備份將數據庫SQL Server的默認備份目錄（我相信你在安裝時指定）。

備份命令有大量的選項可用，this MSDN entry是瞭解更多信息的非常好的起點。