用asp.net还原与恢复sqlserver数据库

  
上次做了个项目，涉及到数据库的还原和恢复，到网上找了一下，是利用SQLDMO实现的，只要添加SQLDMO引用就好了，然后利用下边的类的方法就可以实现了。
我把原作者的类扩充了一下，可以自动识别web.config里 的数据库连接字符串，可以通过变量设置还原恢复的信息。

需要注意的时还原，还原的时候问题最大了，有别的用户使用数据库的时候无法还原，解决办法就是在MASTER数据库中添加一个存储过程：

create proc killspid (@dbname varchar(20))
as
begin
declare @sql nvarchar(500)
declare @spid int
set @sql='declare getspid cursor for 
select spid from sysprocesses where dbid=db_id('''+@dbname+''')'
exec (@sql)
open getspid
fetch next from getspid into @spid
while @@fetch_status<>-1
begin
exec('kill '+@spid)
fetch next from getspid into @spid
end
close getspid
deallocate getspid
end
GO

在还原之前先执行这个存储过程，需要传递dbname，就是你的数据库的名字。下边是类的原代码：（web.config里的数据库连接字符串是constr）




using System;



using System.Configuration;



using System.Data.SqlClient;



using System.Data;



namespace web.base_class



{



     /// <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 class DbOper



     {



          private string server;



          private string uid;



          private string pwd;



          private string database;



          private string conn;



         /// <summary>



         /// DbOper类的构造函数



         /// </summary>



         public DbOper()



         {



              conn=System.Configuration.ConfigurationSettings.AppSettings["constr"].ToString();



              server=cut(conn,"server=",";");



              uid=cut(conn,"uid=",";");



              pwd=cut(conn,"pwd=",";");



              database=cut(conn,"database=",";");



         }



         public string cut(string str,string bg,string ed)



         {



              string sub;



              sub=str.Substring(str.IndexOf(bg)+bg.Length);



              sub=sub.Substring(0,sub.IndexOf(";"));



              return sub;



         }







         /// <summary>



         /// 数据库备份



         /// </summary>



         public  bool DbBackup(string url)



         {



              SQLDMO.Backup oBackup = new SQLDMO.BackupClass();



              SQLDMO.SQLServer oSQLServer = new SQLDMO.SQLServerClass();



              try



              {



                   oSQLServer.LoginSecure = false;



                   oSQLServer.Connect(server,uid, pwd);



                   oBackup.Action = SQLDMO.SQLDMO_BACKUP_TYPE.SQLDMOBackup_Database;



                   oBackup.Database = database;



                   oBackup.Files = url;//"d:\Northwind.bak";



                   oBackup.BackupSetName = database;



                   oBackup.BackupSetDescription = "数据库备份";



                   oBackup.Initialize = true;



                   oBackup.SQLBackup(oSQLServer);



                   return true;



              }



              catch



              {



                   return false;



                   throw;



              }



              finally



              {



                   oSQLServer.DisConnect();



              }



         }







         /// <summary>



         /// 数据库恢复



         /// </summary>



         public string DbRestore(string url)



         {



              if(exepro()!=true)//执行存储过程



              {



                   return "操作失败";



              }



              else



              {



                   SQLDMO.Restore oRestore = new SQLDMO.RestoreClass();



                   SQLDMO.SQLServer oSQLServer = new SQLDMO.SQLServerClass();



                   try



                   {



                        oSQLServer.LoginSecure = false;



                        oSQLServer.Connect(server, uid, pwd);



                        oRestore.Action = SQLDMO.SQLDMO_RESTORE_TYPE.SQLDMORestore_Database;



                        oRestore.Database = database;



                        oRestore.Files = url;//@"d:\Northwind.bak";



                        oRestore.FileNumber = 1;



                        oRestore.ReplaceDatabase = true;



                        oRestore.SQLRestore(oSQLServer);



                       return "ok";



                   }



                   catch(Exception e)



                   {



                       return "恢复数据库失败";



                       throw;



                   }



                   finally



                   {



                        oSQLServer.DisConnect();



                   }



              }



         }



          private bool exepro()



         {



              SqlConnection conn1 = new SqlConnection("server="+server+";uid="+uid+";pwd="+pwd+";database=master");



              SqlCommand cmd = new SqlCommand("killspid",conn1);



              cmd.CommandType = CommandType.StoredProcedure;



              cmd.Parameters.Add("@dbname","port");



              try



              {



                   conn1.Open();



                   cmd.ExecuteNonQuery();



                   return true;



              }



              catch(Exception ex)



              {



                   return false;



              }



              finally



              {



                   conn1.Close();



              }







         }



     }



}