C#备份与恢复.bak数据库备份文件，解决恢复时数据库被占用问题
开发了一个程序，将数据库中的数据在每次修改前先从公共盘恢复到本地SQL中，修改完再备份到公共盘，实现多台电脑共享数据。在恢复是一直存在别的程序在占用数据库，使用了简单粗暴的方法，直接KILL掉指定数据库的所有连接
///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 =FestoMHJ9";
conn.Open();
string sql = "SELECT spid FROM sysprocesses ,sysdatabases WHERE sysprocesses.dbid=sysdatabases.dbid AND sysdatabases.Name='" +
"Specification" + "'";
SqlCommand cmd1 = new SqlCommand(sql, conn);
SqlDataReader dr;
ArrayList list = new ArrayList();
try
{
dr = cmd1.ExecuteReader();
while (dr.Read())
{
list.Add(dr.GetInt16(0));
}
dr.Close();
}
catch (SqlException eee)
{
MessageBox.Show(eee.ToString());
}
finally
{
conn.Close();
}
//MessageBox.Show(list.Count.ToString());
for (int i = 0; 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 =FestoMHJ9";
string database = "Specification";
string path = "C:\\。。。\\11.bak";//需恢复bak文件的路径
string BACKUP = "restore database Specification from disk = '" + path + "' with move 'Specification' to '" + "C:\\。。\\linshi.mdf',move 'Specification_log' to'" + "C:\\。。\\linshi_log.ldf'";//别忘啦move to
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";
}
我程序里存在三个占用。
备份程序比较简单，可以参考如下：
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(0));
}
dr.Close();
}
catch (SqlException eee)
{
MessageBox.Show(eee.ToString());
}
finally
{
conn.Close();
}
//MessageBox.Show(list.Count.ToString());
for (int i = 0; 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";
}
}
}
