c#网站对服务器的数据库的备份与还原

在网站上备份数据库

1.前台页面

 <div>
         需要备份的文件名：<asp:TextBox ID="bfFile" runat="server" Text="shuJuKu"></asp:TextBox>
         <asp:Button ID="btnBak" runat="server" Text="备份" OnClick="btnBak_Click" />&nbsp;
         <asp:Button ID="btnReduct" runat="server" Text="恢复" OnClick="btnReduct_Click" />&nbsp;
         <asp:Button ID="btnDelete" runat="server" Text="删除备份文件" OnClick="btnDelete_Click" />&nbsp;
         <asp:Button ID="btnDown" runat="server" Text="下载备份文件" OnClick="btnDown_Click" />
 </div>

前台布局

2.后台代码

 //删除时用到的库
 [DllImport("kernel32.dll")]
 public static extern IntPtr _lopen(string lpPathName, int iReadWrite);

 [DllImport("kernel32.dll")]
 public static extern bool CloseHandle(IntPtr hObject);

 public const int OF_READWRITE = ;
 public const int OF_SHARE_DENY_NONE = 0x40;
 public readonly IntPtr HFILE_ERROR = new IntPtr(-);

删除时用到的库

 protected void btnBak_Click(object sender, EventArgs e)
        {
            ///
            ///备份方法
            ///
            SqlConnection conn = new SqlConnection("Server=数据库ip地址;Database=要备份的数据库;User ID=用户名;Password=密码;");//连接数据库语句

            SqlCommand cmdBK = new SqlCommand();
            cmdBK.CommandType = CommandType.Text;
            cmdBK.Connection = conn;
            cmdBK.CommandText = @"backup database ccd to disk='"+this.bfFile.Text+".bak' with init";//数据备份语句：backup database 数据库名 to disk='保存路径\dbName.bak'

            try
            {
                conn.Open();
                cmdBK.ExecuteNonQuery();
                Response.Write("<script>alert(\"恭喜你，数据成功恢复为所选文档的状态！\");</script>");
            }
            catch (Exception ex)
            {
                Response.Write("<script>alert(\"" + ex.Message + "\");</script>");
            }
            finally
            {
                conn.Close();
                conn.Dispose();
            }
        }

备份代码

 protected void btnDown_Click(object sender, EventArgs e)
         {

             //下载的文件和网页的是在同一服务器上

             string fileName = "aaa.bak";//客户端保存的文件名
             string filePath = Server.MapPath("aaa.bak");//路径

             //以字符流的形式下载文件
             FileStream fs = new FileStream(filePath, FileMode.Open);
             byte[] bytes = new byte[(int)fs.Length];
             fs.Read(bytes, , bytes.Length);
             fs.Close();
             Response.ContentType = "application/octet-stream";
             //通知浏览器下载文件而不是打开
             Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
             Response.BinaryWrite(bytes);
             Response.Flush();
             Response.End();
         }

下载代码

 protected void btnReduct_Click(object sender, EventArgs e)
         {
         ///
            ///还原方法
            ///

             ///杀死原来所有的数据库连接进程
             SqlConnection conn = new SqlConnection();
             conn.ConnectionString = "Data Source=数据库的IP地址;Initial Catalog=master;User ID=用户名;pwd=密码";
             conn.Open();
             string sql = "use [master] SELECT spid FROM sysprocesses ,sysdatabases WHERE sysprocesses.dbid=sysdatabases.dbid AND sysdatabases.Name='要备份的数据库'";
             SqlCommand cmd1 = new SqlCommand(sql, conn);
             SqlDataReader dr;
             ArrayList list = new ArrayList();
             try
             {
                 dr = cmd1.ExecuteReader();
                 while (dr.Read())
                 {
                     list.Add(dr.GetInt16());
                 }
                 dr.Close();
             }
             catch (SqlException eee)
             {
                 Response.Write("<script>alert(\""+eee.ToString()+"\");</script>");
             }
             finally
             {
                 conn.Close();
             }
             //MessageBox.Show(list.Count.ToString());
             for (int i = ; i < list.Count; i++)
             {
                 conn.Open();
                 cmd1 = new SqlCommand(string.Format("KILL {0}", list[i].ToString()), conn);
                 cmd1.ExecuteNonQuery();
                 conn.Close();
                 Response.Write("<script>alert(\"系统已经清除的数据库线程： " + list[i].ToString() + "\r\n正在还原数据库！");
             }
             //这里一定要是master数据库，而不能是要还原的数据库，因为这样便变成了有其它进程
             //占用了数据库。
             string constr = @"Data Source=数据库的IP地址;Initial Catalog=master;User ID=用户名;pwd=密码";
             string database = "myNewDb";
             //string path = "D:\\shuJuKu.bak";

             string path = "" + bfFile.Text + ".bak";

             string BACKUP = String.Format("RESTORE DATABASE {0} FROM DISK = '{1}' WITH MOVE ", database, path);//数据恢复语句：restore database 数据库名 from disk='保存路径\dbName.bak' WITH MOVE 

             SqlConnection con = new SqlConnection(constr);
             con.Open();

             //string sql2 = "select name from sys.database_files";
             string sql2 = "restore filelistonly from disk='" + path + "'";
             SqlCommand cmd2 = new SqlCommand(sql2, con);
             SqlDataReader dr2 = cmd2.ExecuteReader();
             string str1 = "";
             string str2 = "";
             while(dr2.Read())
             {
                 if (dr2["PhysicalName"].ToString().Contains("mdf"))
                 {
                     str1 = dr2["LogicalName"].ToString();
                 }
                 else if (dr2["PhysicalName"].ToString().Contains("ldf"))
                 {
                     str2 = dr2["LogicalName"].ToString();
                 }
             }
             dr2.Close();

             BACKUP += "'"+str1+"' TO 'd:\\sjk.mdf',";///------数据文件还原后存放的新位置
             BACKUP += "MOVE '"+str2+"' TO 'd:\\sjk.ldf'";//----日志文件还原后存放的新位置

             //BACKUP += "'" + str1 + "' TO 'd:\\shujuku.mdf',";///------数据文件还原后存放的新位置
             //BACKUP += "MOVE '" + str2 + "' TO 'd:\\shujuku.ldf'";//----日志文件还原后存放的新位置

             SqlCommand cmd = new SqlCommand(BACKUP, con);

             try
             {
                 cmd.ExecuteNonQuery();
                 Response.Write("<script>alert(\"还原成功,点击退出系统！\");</script>");
                 //Application.Exit();
                 conn.Close();
                 conn.Dispose();
             }
             catch (SqlException ee)
             {

                 Response.Write("<script>alert(\""+ee.ToString()+"\");</script>");

             }
             finally
             {
                 con.Close();
             }
         }

 protected void btnDelete_Click(object sender, EventArgs e)
         {

             //不能在服务器上删除，只能手动删除

         ///
            ///删除方法
            ///
        //本地的文件删除,网页和服务器在同一ip下，删除的文件路径需要完整的文件路径

             string vFileName = @"D:\\aaa.bak";
             if (!File.Exists(vFileName))
             {//判断文件是否存在
                 Response.Write("<script>alert(\"文件都不存在，你就不要拿来耍了\");</script>");
                 return;
             }
             IntPtr vHandle = _lopen(vFileName, OF_READWRITE | OF_SHARE_DENY_NONE);
             if (vHandle == HFILE_ERROR)
             {//判断文件是否被占用
                 Response.Write("<script>alert(\"文件被占用！\");</script>");
                 return;
             }
             else
             {
                 CloseHandle(vHandle);
                 Response.Write("<script>alert(\"没有被占用！\");</script>");

                 FileInfo file = new FileInfo("D:\\aaa.bak");
                 file.Delete();

             }
         }

我只是实现了在服务器上的备份和还原数据库，网页和数据库在同一服务器上下载文件