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  • 用ASP.NET还原与恢复Sql server

    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 p_killspid
    @dbname varchar(200) --要关闭进程的数据库名
    as
    declare @sql nvarchar(500)
    declare @spid nvarchar(20)

    declare #tb cursor for
    select spid=cast(spid as varchar(20)) from master..sysprocesses where dbid=db_id(@dbname)
    open #tb
    fetch next from #tb into @spid
    while @@fetch_status=0
    begin
    exec('kill '+@spid)
    fetch next from #tb into @spid
    end
    close #tb
    deallocate #tb
    go

    (下面这个存储过程失败)

      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();
    }
    }
    }
    }

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  • 原文地址:https://www.cnblogs.com/lds85930/p/1209349.html
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