注册 登录  
 加关注
   显示下一条  |  关闭
温馨提示!由于新浪微博认证机制调整,您的新浪微博帐号绑定已过期,请重新绑定!立即重新绑定新浪微博》  |  关闭

一路奔跑

奔跑着一路向前...

 
 
 

日志

 
 

C#实现SQL数据库备份与恢复  

2010-12-24 15:58:45|  分类: Asp.net |  标签: |举报 |字号 订阅

  下载LOFTER 我的照片书  |
有两种方法,都是保存为.bak文件。一种是直接用Sql语句执行,另一种是通过引用SQL Server的SQLDMO组件来实现:

 1.通过执行Sql语句来实现
注意,用Sql语句实现备份与还原操作时,最好不要使用需要备份或还原的数据库连接,而使用master,否则可能会出现如下三个问题:(1)超时时间已到。在操作完成之前超时时间已过或服务器未响应。(2)  在向服务器发送请求时发生传输级错误。(provider:共享内存提供程序,error:0-系统无法打开文件。)  (3)从服务器接收结果时发生传输级错误。(provider:共享内存提供程序,error:0    系统无法打开文件。) ,如果一定要用这个连接的话,要注意在执行Sql语句前加个Sql语句:use master,这样可能会解决以上问题。
     (1)数据备份语句:backup database  数据库名 to disk='保存路径\dbName.bak'
     (2)数据恢复语句:restore database 数据库名 from disk='保存路径\dbName.bak'   WITH MOVE 'dbName_Data' TO 'c:\tcomcrm20041217.mdf', --数据文件还原后存放的新位置
MOVE 'dbName_Log' TO 'c:\comcrm20041217.ldf' ----日志文件还原后存放的新位置
关于这两个语句还有更详细的介绍:http://blog.csdn.net/holyrong/archive/2007/08/29/1764105.aspx

            //数据库备份与恢复实例
            private void btnBak_Click(object sender, EventArgs e) //备份
        {
            string saveAway = this.tbxBakLoad.Text.ToString().Trim();
            string cmdText = @"backup database " + System.Configuration.ConfigurationSettings.AppSettings["dbName"] + " to disk='" + saveAway + "'";
            BakReductSql(cmdText,true);           
        }
        private void btnReduct_Click(object sender, EventArgs e)  //恢复
        {
            string openAway = this.tbxReductLoad.Text.ToString().Trim();//读取文件的路径
            string cmdText = @"restore database " + System.Configuration.ConfigurationSettings.AppSettings["dbName"] + " from disk='" + openAway + "'";           
            BakReductSql(cmdText,false);
        }
        /// <summary>
        /// 对数据库的备份和恢复操作,Sql语句实现
        /// </summary>
        /// <param name="cmdText">实现备份或恢复的Sql语句</param>
        /// <param name="isBak">该操作是否为备份操作,是为true否,为false</param>
        private void BakReductSql(string cmdText,bool isBak)
        {
            SqlCommand cmdBakRst = new SqlCommand();
            SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=master;uid=sa;pwd=;");
            try
            {
                conn.Open();
                cmdBakRst.Connection = conn;
                cmdBakRst.CommandType = CommandType.Text;
                if (!isBak)     //如果是恢复操作
                {
                    string setOffline = "Alter database GroupMessage Set Offline With rollback immediate ";
                    string setOnline = " Alter database GroupMessage Set Online With Rollback immediate";
                    cmdBakRst.CommandText = setOffline + cmdText + setOnline;
                }
                else
                {
                    cmdBakRst.CommandText = cmdText;
                }
                cmdBakRst.ExecuteNonQuery();
                if (!isBak)
                {
                    MessageBox.Show("恭喜你,数据成功恢复为所选文档的状态!", "系统消息");
                }
                else
                {
                    MessageBox.Show("恭喜,你已经成功备份当前数据!", "系统消息");
                }
            }
            catch (SqlException sexc)
            {
                MessageBox.Show("失败,可能是对数据库操作失败,原因:" + sexc, "数据库错误消息");
            }
            catch (Exception ex)
            {
                MessageBox.Show("对不起,操作失败,可能原因:" + ex, "系统消息");
            }
            finally
            {
                cmdBakRst.Dispose();
                conn.Close();
                conn.Dispose();
            }
        }
另外,如果出现:“尚未备份数据库的日志尾部”错误,可以在还原语句后加上 With Replace 或 With stopat
                   
2.用SQLDMO实现(下面代码引用别人的)
    //数据库备份
        string backaway =textbox1.Text.Trim();
            SQLDMO.Backup oBackup = new SQLDMO.BackupClass();
            SQLDMO.SQLServer oSQLServer = new SQLDMO.SQLServerClass();
            try
            {
                oSQLServer.LoginSecure = false;
                //下面设置登录sql服务器的ip,登录名,登录密码
                oSQLServer.Connect(serverip, serverid, serverpwd);
                oBackup.Action = 0;
               //下面两句是显示进度条的状态
                SQLDMO.BackupSink_PercentCompleteEventHandler pceh = new SQLDMO.BackupSink_PercentCompleteEventHandler(Step2);
                oBackup.PercentComplete += pceh;
                //数据库名称:
                oBackup.Database = "k2";
                //备份的路径
                oBackup.Files = @backaway;
                //备份的文件名
                oBackup.BackupSetName = "k2";
                oBackup.BackupSetDescription = "数据库备份";
                oBackup.Initialize = true;
                oBackup.SQLBackup(oSQLServer);
                MessageBox.Show("备份成功!", "提示");
            }
            catch
            {
                MessageBox.Show("备份失败!", "提示");
            }
            finally
            {
                oSQLServer.DisConnect();
            }

 

//数据库恢复
        //获取恢复的路径
        string dbaway = textbox2.Text.Trim();
            SQLDMO.Restore restore = new SQLDMO.RestoreClass();
            SQLDMO.SQLServer server = new SQLDMO.SQLServerClass();
            server.Connect(serverip, serverid, serverpwd);

            //KILL DataBase Process
            conn = new 工资管理系统.CCUtility.connstring();
            conn.DBOpen();
            SqlCommand cmd = new SqlCommand("use master Select spid FROM sysprocesses ,sysdatabases Where sysprocesses.dbid=sysdatabases.dbid AND sysdatabases.Name='k2'", conn.Connection);
            SqlDataReader dr = cmd.ExecuteReader();
            while (dr.Read())
            {
                server.KillProcess(Convert.ToInt32(dr[0].ToString()));
            }
            dr.Close();
            conn.DBClose();

            try
            {
                restore.Action = 0;
                SQLDMO.RestoreSink_PercentCompleteEventHandler pceh = new SQLDMO.RestoreSink_PercentCompleteEventHandler(Step);
                restore.PercentComplete += pceh;
                restore.Database = "k2";
                restore.Files = @dbaway;
                restore.ReplaceDatabase = true;
                restore.SQLRestore(server);
                MessageBox.Show("数据库恢复成功!");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                server.DisConnect();
            }

恢复相关的参数和备份相同,不再解释,自己看一下.

上面两个函数调用到了更改进度条的两个函数:

       private void Step2(string message, int percent)
        {
            progressBar2.Value = percent;
        }

        private void Step(string message, int percent)
        {
            progressBar1.Value = percent;
        }

setp对应备份,,setp2对应恢复....

  评论这张
 
阅读(217)| 评论(0)
推荐 转载

历史上的今天

评论

<#--最新日志,群博日志--> <#--推荐日志--> <#--引用记录--> <#--博主推荐--> <#--随机阅读--> <#--首页推荐--> <#--历史上的今天--> <#--被推荐日志--> <#--上一篇,下一篇--> <#-- 热度 --> <#-- 网易新闻广告 --> <#--右边模块结构--> <#--评论模块结构--> <#--引用模块结构--> <#--博主发起的投票-->
 
 
 
 
 
 
 
 
 
 
 
 
 
 

页脚

网易公司版权所有 ©1997-2017