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QiShunwang

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用ASP.NET还原与恢复Sql server

2021/4/26 22:07:11   来源:

  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
    ...{
    /**////
     /// DbOper类,主要应用SQLDMO实现对Microsoft SQL Server数据库的备份和恢复
    ///
     public class DbOper
    ...{
    private string server;
    private string uid;
    private string pwd;
    private string database;
    private string conn;
    /**////
     /// DbOper类的构造函数
    ///
     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;
    }
   /**////
     /// 数据库备份
    ///
     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();
    }
   }
///数据库恢复 ///
  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();
 }
}
}
}