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（有关COM的概念，请参看我的COM与COM+技术那篇文章），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：

public  sealed  class  DbOper
{
     ///<summary>
     /// DbOper类的构造函数
///作者：Shadow
     ///</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();
         }
     }
}