asp.net还原与恢复sqlserver数据库教程

2024-07-10 13:13:17

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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();

   }



   }

   }

  }