asp.net远程备份sql server2000数据库的方法

精选转载

davidangel 2009-09-17 22:35:10

其实备份和恢复数据库都是利用SQL Server提供的SQL语句来备份的。
备份：use master;backup database @name to disk=@path;
恢复：use master;restore database @name from disk=@path;
上面用的是参数化SQL语句，可以在程序执行的时候动态给参数赋值。

代码：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="DatabaseAction.aspx.cs" Inherits="DatabaseAction" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table border="0" width="100%">
<tr><td colspan="2">数据库还原和备份</td></tr>
<tr><td>请选择数据库</td><td>
<asp:DropDownList ID="ddlDatabaseList" runat="server">
</asp:DropDownList></td></tr>
<tr><td>
数据库文件名</td><td>
<asp:TextBox ID="txtDbFileName" runat="server"></asp:TextBox></td></tr>
<tr><td>
操作选项</td><td>
<asp:RadioButton ID="rbBackup" runat="server" Checked="True" GroupName="action" Text="备份" />
<asp:RadioButton ID="rbRestore" runat="server" GroupName="action" Text="还原" /></td></tr>
<tr><td>
操作</td><td>
<asp:Button ID="btnOK" runat="server" OnClick="btnOK_Click" Text="执行" /></td></tr>
</table>
</div>
</form>
</body>
</html>

后台代码：

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
/// <summary>
/// 功能说明：本例中演示在asp.net中如何备份和恢复数据库
/// 备份数据库主要使用数据库的备份语句。数据库备份文件放在
/// App_Data文件夹下。
public partial class DatabaseAction : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
//在DropDownList中绑定所有数据库
SqlConnection connection = new SqlConnection("Data Source=localhost;User ID=sa;Password=sa");
SqlCommand command = new SqlCommand("sp_helpdb", connection);
command.CommandType = CommandType.StoredProcedure;
connection.Open();
SqlDataReader reader = command.ExecuteReader();
ddlDatabaseList.DataSource = reader;
ddlDatabaseList.DataTextField = "Name";
ddlDatabaseList.DataBind();
reader.Close();
connection.Close();
}
}
protected void btnOK_Click(object sender, EventArgs e)
{
string dbFileName = txtDbFileName.Text.Trim();
SqlConnection connection = new SqlConnection("Data Source=localhost;User ID=sa;Password=sa");
string dbName = ddlDatabaseList.SelectedValue;
if (!dbFileName.EndsWith(".bak"))
{
dbFileName += ".bak";
}
if (rbBackup.Checked)//备份数据库
{
SqlCommand command = new SqlCommand("use master;backup database @name to disk=@path;",connection);
connection.Open();
string path=Server.MapPath("~\\App_Data")+"\\"+dbFileName;
command.Parameters.AddWithValue("@name", dbName);
command.Parameters.AddWithValue("@path", path);
command.ExecuteNonQuery();
connection.Close();
}
else//恢复数据库
{
SqlCommand command = new SqlCommand("use master;restore database @name from disk=@path;", connection);
connection.Open();
string path = Server.MapPath("~\\App_Data") + "\\" + dbFileName;
command.Parameters.AddWithValue("@name", dbName);
command.Parameters.AddWithValue("@path", path);
command.ExecuteNonQuery();
connection.Close();
}
}
}

   public void TransportFile()//将备份的文件传送到本机
    {
        System.IO.Stream iStream = null;

//以10K为单位缓存:
byte[] buffer = new Byte[10000];

int length;

long dataToRead;

        // 制定文件路径.
        string datestr = System.DateTime.Now.Date.ToString("yyyyMMdd");//系统当前日期YYYY-MM-DD
        //string formatdatestr = datestr.Substring(0,4) + datestr.Substring(5,2) + datestr.Substring(8,2);
        string filepath = @"E:\study\DMS\File\"+datestr+"";

// 得到文件名.
string filename = System.IO.Path.GetFileName(filepath);

        try
        {
            // 打开文件.
            iStream = new System.IO.FileStream(filepath, System.IO.FileMode.Open,System.IO.FileAccess.Read, System.IO.FileShare.Read);

// 得到文件大小:
dataToRead = iStream.Length;

Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Disposition", "p_w_upload; filename=" + filename+"BAK");

            while (dataToRead > 0)
            {
                //保证客户端连接
                if (Response.IsClientConnected)
                {
                    length = iStream.Read(buffer, 0, 10000);

Response.OutputStream.Write(buffer, 0, length);

Response.Flush();

                    buffer = new Byte[10000];
                    dataToRead = dataToRead - length;
                }
                else
                {
                    //结束循环
                    dataToRead = -1;
                }
            }
        }
        catch (Exception ex)
        {
            // 出错.
            throw ex;
        }
        finally
        {
            if (iStream != null)
            {
                //关闭文件
                iStream.Close();
            }
        }
    }