数据库备份与还原

   SQLDMO(SQL Distributed Management Objects，SQL分布式管理对象)封装了Microsoft SQL Server数据库中的对象。SQLDMO是Microsoft SQL Server中企业管理器所使用的应用程序接口，所以它可以执行很多功能，其中当然也包括对数据库的备份和恢复。

      SQLDMO由Microsoft SQL Server自带的SQLDMO.dll提供，由于SQLDMO.dll是一个COM对象，所以大家在用之前必须在.NET项目中添加对它的引用.

下面是用C#语言书写的用于Microsoft SQL Server数据库备份和恢复的类：

using System;

namespace DbService
{
 /// <summary>
 /// DbOper类,主要应用SQLDMO实现对Microsoft SQL Server数据库的备份和恢复
 /// </summary>
 public sealed class DbOper
 {
  /// <summary>
  /// DbOper类的构造函数
  /// </summary>
  private DbOper()
  {
  }

  /// <summary>
  /// 数据库备份
  /// </summary>
  public static void DbBackup()
  {
   SQLDMO.Backup oBackup = new SQLDMO.BackupClass();
   SQLDMO.SQLServer oSQLServer = new SQLDMO.SQLServerClass();
   try
   {
    oSQLServer.LoginSecure = false;
    oSQLServer.Connect("localhost", "sa", "1234");
    oBackup.Action = SQLDMO.SQLDMO_BACKUP_TYPE.SQLDMOBackup_Database;
    oBackup.Database = "Northwind";
    oBackup.Files = @"d:\Northwind.bak";
    oBackup.BackupSetName = "Northwind";
    oBackup.BackupSetDescription = "数据库备份";
    oBackup.Initialize = true;
    oBackup.SQLBackup(oSQLServer);
   }
   catch
   {
    throw;
   }
   finally
   {
    oSQLServer.DisConnect();
   }
  }

  /// <summary>
  /// 数据库恢复
  /// </summary>
  public static void DbRestore()
  {
   SQLDMO.Restore oRestore = new SQLDMO.RestoreClass();
   SQLDMO.SQLServer oSQLServer = new SQLDMO.SQLServerClass();
   try
   {
    oSQLServer.LoginSecure = false;
    oSQLServer.Connect("localhost", "sa", "1234");
    oRestore.Action = SQLDMO.SQLDMO_RESTORE_TYPE.SQLDMORestore_Database;
    oRestore.Database = "Northwind";
    oRestore.Files = @"d:\Northwind.bak";
    oRestore.FileNumber = 1;
    oRestore.ReplaceDatabase = true;
    oRestore.SQLRestore(oSQLServer);
   }
   catch
   {
    throw;
   }
   finally
   {
    oSQLServer.DisConnect();
   }
  }
 }
}

文件夹权限的修改

if (File.Exists("c:\\uploadf") == true)
{
FileInfo fileinfo = new FileInfo("c:\\uploadf");
fileinfo.Attributes = FileAttributes.Normal;
}