WinForm c# 备份 还原 数据库

 其实是个非常简单的问题，一个Form，一个Button,一个OpenFileDialog,一个SaveFileDialog.下面给出备份与还原类

using System;

using System.Collections.Generic;

using System.Text;

using System.Data;

using System.Data.SqlClient;

using System.IO;

using System.Collections;

using System.Windows.Forms;

namespace 我的备份与还原

{

    class 备份与还原数据库

    {

        static string connectionString = "server=.;database=master;uid=sa;pwd=";

        SqlConnection conn = new SqlConnection(connectionString);

        /// <summary>

        /// 备份指定的数据库文件

        /// </summary>

        /// <param name="databasename">要还原的数据库</param>

        /// <returns></returns>

        public bool BackUpDataBase( string databasefile)

        {

            if (!File.Exists(databasefile))

            {

            }

            //还原的数据库MyDataBase

            string sql = "BACKUP DATABASE " + "MyDataBase" + " TO DISK = '" + databasefile + ".bak' ";

            conn.Open();

            SqlCommand comm = new SqlCommand(sql, conn);

            comm.CommandType = CommandType.Text;

            try

            {

                comm.ExecuteNonQuery();

            }

            catch (Exception err)

            {

                string str = err.Message;

                conn.Close();

                return false;

            }

            conn.Close();//关闭数据库连接

            return true;

        }

//以下是还原数据库，稍微麻烦些，要关闭所有与当前数据库相连的连接------------------------------------

//--------------------------------------------------------------------------------------------------------------------------

        public string RestoreDatabase(string backfile)

        {

            ///杀死原来所有的数据库连接进程

            SqlConnection conn = new SqlConnection();

            conn.ConnectionString = "Data Source=.;Initial Catalog=master;User ID=sa;pwd =";

            conn.Open();

            string sql = "SELECT spid FROM sysprocesses ,sysdatabases WHERE sysprocesses.dbid=sysdatabases.dbid AND sysdatabases.Name='" +

                          "MyDataBase"+ "'";

            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)

            {

                MessageBox.Show(eee.ToString());

            }

            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();

                MessageBox.Show("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=.;Initial Catalog=master;User ID=sa;pwd =";

            string database = MyDataBase;

            string path = backfile;

            string BACKUP = String.Format("RESTORE DATABASE {0} FROM DISK = '{1}'", database, path);

            SqlConnection con = new SqlConnection(constr);

            SqlCommand cmd = new SqlCommand(BACKUP, con);

            con.Open();

            try

            {

                cmd.ExecuteNonQuery();

                MessageBox.Show("还原成功,点击退出系统！");

                Application.Exit();

            }

            catch (SqlException ee)

            {

                //throw(ee);

                //MessageBox.Show("还原失败");

                MessageBox.Show(ee.ToString());

            }

            finally

            {

                con.Close();

            }

            return "成功与否字符串";

        }

    }

}