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标题: 用asp.net还原与恢复sqlserver数据库 [打印本页]

作者: 云飞 时间: 2009-3-16 19:36
标题: 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();

            }

      }

   }

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