.net数据库的备份还原方法
程序的安全性很重要,其中表现为防止恶意代码对程序的破坏性及对数据库教程的备份,以防止程序破坏后可以及时还原得回数据.
1.备份
SqlConnection connection = new SqlConnection(ConfigurationManager.AppSettings["Connection"]);
string dbFileName = DateTime.Now.ToString("yyyyMMddHHmmss")+".bak";
try
{
SqlCommand command = new SqlCommand("use master;backup database xxdl to disk=@path;", connection);
connection.Open();
string path = Server.MapPath("~App_Data") + "" + dbFileName;
command.Parameters.AddWithValue("@path", path);
command.ExecuteNonQuery();
lblBackup.Text = "数据库备份成功";
}
catch (Exception ex)
{lblBackup.Text = ex.Message;
}
finally
{
connection.Close();
}
Bind();//产生了新备份文件，更新下拉框2 还原
SqlConnection conn = new SqlConnection(ConfigurationManager.AppSettings["Connection"]);
string dbFileName = ddlRestore.SelectedValue;
if (dbFileName == string.Empty)
{
lblRestore.Text = "没有数据库备份文件，请先备份";
return;
}
try
{
string sql2 = "Alter Database xxdl Set Offline with Rollback immediate;use master;restore database xxdl from disk=@path With Replace;Alter Database xxdl Set OnLine With rollback Immediate;";
SqlCommand command = new SqlCommand(sql2,conn);
conn.Open();
string path = Server.MapPath("~App_Data") + "" + dbFileName;
command.Parameters.AddWithValue("@path", path);
command.ExecuteNonQuery();
lblRestore.Text = "数据库还原成功";
}
catch (System.Exception ex)
{
lblRestore.Text = ex.Message;
}
finally
{
conn.Close();
Session.Abandon();
Response.Redirect("login.asp教程x");
}
方法二
功能：
自动识别Web.Config配置信息.
备份与还原数据库.
代码如下：using System;
using System.Configuration;
using System.Data.SqlClient;
using System.Data;
namespace OA.Web
{/// <summary>
/// SqlDbBackUpRestore类,主要应用SQLDMO实现对Microsoft SQL Server数据库 的备份和恢复
/// 请先给项目添加COM(Mircrosoft SQLDMO Object Library)引用
/// </summary>public class SqlDbBackUpRestore
{
/// <summary>
/// sql服务器名称或者IP地址
/// </summary>
private string server;/// <summary>
///用户名称
/// </summary>
private string uid;/// <summary>
/// 用户密码
/// </summary>
private string pwd;/// <summary>
/// 数据库名称
/// </summary>
private string database;/// <summary>
/// Web.Config连接字符串
/// </summary>
private string conn;
/// <summary>
/// SqlDbBackUpRestore类的构造函数
/// </summary>
public SqlDbBackUpRestore()
{conn = System.Configuration.ConfigurationSettings.AppSettings["ConnectionSqlServer"].ToString();
server = cut(conn, "server=", ";");
uid = cut(conn, "uid=", ";");
pwd = cut(conn, "pwd=", ";");
database = cut(conn, "database=", ";");
}
public string cut(string str, string bg, string ed)
{string sub;
sub = str.Substring(str.IndexOf(bg) + bg.Length);
sub = sub.Substring(0, sub.IndexOf(";"));
return sub;
}
/// <summary>
/// 数据库database备份
/// </summary>
public bool DbBackup(string url)
{SQLDMO.Backup oBackup = new SQLDMO.BackupClass();
SQLDMO.SQLServer oSQLServer = new SQLDMO.SQLServerClass();
try
{oSQLServer.LoginSecure = false;
oSQLServer.Connect(server, uid, pwd);
oBackup.Action = SQLDMO.SQLDMO_BACKUP_TYPE.SQLDMOBackup_Database;
oBackup.Database = database;
oBackup.Files = url;//"d:/Northwind.bak";
oBackup.BackupSetName = database;
oBackup.BackupSetDescription = "数据库备份";
oBackup.Initialize = true;
oBackup.SQLBackup(oSQLServer);
return true;
}catch
{
return false;
throw;
}finally
{
oSQLServer.DisConnect();
}}
/// <summary>
/// 数据库database恢复
/// </summary>public string DbRestore(string url)
{if (KillProcesses() != true)//执行存储过程
{return "操作失败";
}
else
{SQLDMO.Restore oRestore = new SQLDMO.RestoreClass();
SQLDMO.SQLServer oSQLServer = new SQLDMO.SQLServerClass();
try
{oSQLServer.LoginSecure = false;
oSQLServer.Connect(server, uid, pwd);
oRestore.Action = SQLDMO.SQLDMO_RESTORE_TYPE.SQLDMORestore_Database;
oRestore.Database = database;
oRestore.Files = url;//@"d:/Northwind.bak";
oRestore.FileNumber = 1;
oRestore.ReplaceDatabase = true;
oRestore.SQLRestore(oSQLServer);
return "OK";
}
catch (Exception e)
{
return "恢复数据库失败";
throw;
}
finally
{
oSQLServer.DisConnect();
}}
}
/// <summary>
/// 杀死Sql database 连接进程
/// </summary>
/// <returns></returns>
private bool KillProcesses()
{SQLDMO.SQLServer svr = new SQLDMO.SQLServerClass();
try
{
svr.Connect(server, uid, pwd);
SQLDMO.QueryResults qr = svr.EnumProcesses(-1);
int iColPIDNum = -1;
int iColDbName = -1;
for (int i = 1; i <= qr.Columns; i++)
{
string strName = qr.get_ColumnName(i);
if (strName.ToUpper().Trim() == "SPID")
{
iColPIDNum = i;
}
else if (strName.ToUpper().Trim() == "DBNAME")
{
iColDbName = i;
}
if (iColPIDNum != -1 && iColDbName != -1)
break;
}for (int i = 1; i <= qr.Rows; i++)
{
int lPID = qr.GetColumnLong(i, iColPIDNum);
string strDBName = qr.GetColumnString(i, iColDbName);
if (strDBName.ToUpper() == database.ToUpper())
{svr.KillProcess(lPID);
}
}
return true;
}
catch
{
//失败
return false;
}
finally
{
svr.DisConnect();
}}
}
}
access数据库还原备份
Asp.net 备份和还原SQL Server及压缩Access数据库2009年11月17日 星期二 12:27*
* 功能说明:备份和恢复SQL Server数据库
* 作者: 刘功勋;
* 版本:V0.1(C#2.0);时间:2007-1-1
* 当使用SQL Server时,请引用 COM组件中的,SQLDMO.dll组件
* 当使用Access中,请浏览添加引用以下两个dll
* 引用C:/Program Files/Common Files/System/ado/msadox.dll,该DLL包含ADOX命名空间
* 引用C:/Program Files/Common Files/System/ado/msjro.dll,该DLL包含JRO命名空间
* *******************************************************************************/
using System;
using System.Data;
using System.Configuration;
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.IO;
using ADOX;//该命名空间包含创建ACCESS的类(方法)--解决方案 ==> 引用 ==> 添加引用 ==> 游览找到.dll
using JRO;//该命名空间包含压缩ACCESS的类(方法)namespace EC
{
/// <summary>
/// 数据库恢复和备份
/// </summary>
public class SqlBackObject
{
public SqlBackObject()
{
//
// TODO: 在此处添加构造函数逻辑
//
}#region SQL数据库备份
/// <summary>
/// SQL数据库备份
/// </summary>
/// <param name="ServerIP">SQL服务器IP或(Localhost)</param>
/// <param name="LoginName">数据库登录名</param>
/// <param name="LoginPass">数据库登录密码</param>
/// <param name="DBName">数据库名</param>
/// <param name="BackPath">备份到的路径</param>
public static void SQLBACK(string ServerIP,string LoginName,string LoginPass,string DBName,string BackPath)
{
SQLDMO.Backup oBackup = new SQLDMO.BackupClass();
SQLDMO.SQLServer oSQLServer = new SQLDMO.SQLServerClass();
try
{
oSQLServer.LoginSecure = false;
oSQLServer.Connect(ServerIP, LoginName, LoginPass);
oBackup.Database = DBName;
oBackup.Files = BackPath;
oBackup.BackupSetName = DBName;
oBackup.BackupSetDescription = "数据库备份";
oBackup.Initialize = true;
oBackup.SQLBackup(oSQLServer);}
catch (Exception e)
{
throw new Exception(e.ToString());
}
finally
{
oSQLServer.DisConnect();
}
}
#endregion#region SQL恢复数据库
/// <summary>
/// SQL恢复数据库
/// </summary>
/// <param name="ServerIP">SQL服务器IP或(Localhost)</param>
/// <param name="LoginName">数据库登录名</param>
/// <param name="LoginPass">数据库登录密码</param>
/// <param name="DBName">要还原的数据库名</param>
/// <param name="BackPath">数据库备份的路径</param>public static void SQLDbRestore(string ServerIP,string LoginName,string LoginPass,string DBName,string BackPath)
{
SQLDMO.Restore orestore = new SQLDMO.RestoreClass();
SQLDMO.SQLServer oSQLServer = new SQLDMO.SQLServerClass();
try
{
oSQLServer.LoginSecure = false;
oSQLServer.Connect(ServerIP, LoginName, LoginPass);
orestore.Action = SQLDMO.SQLDMO_RESTORE_TYPE.SQLDMORestore_Database;
orestore.Database = DBName;
orestore.Files = BackPath;
orestore.FileNumber = 1;
orestore.ReplaceDatabase = true;
orestore.SQLRestore(oSQLServer);}
catch (Exception e)
{
throw new Exception(e.ToString());
}
finally
{
oSQLServer.DisConnect();
}
}
#endregion#region 根据指定的文件名称创建Access数据库
/// <summary>
/// 根据指定的文件名称创建数据
/// </summary>
/// <param name="DBPath">绝对路径+文件名称</param>
public static void CreateAccess(string DBPath)
{
if (File.Exists(DBPath))//检查数据库是否已存在
{
throw new Exception("目标数据库已存在,无法创建");
}
DBPath = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="+DBPath;
//创建一个CatalogClass对象实例
ADOX.CatalogClass cat = new ADOX.CatalogClass();
//使用CatalogClass对象的Create方法创建ACCESS数据库
cat.Create(DBPath);}
#endregion#region 压缩Access数据库
/// <summary>
/// 压缩Access数据库
/// </summary>
/// <param name="DBPath">数据库绝对路径</param>
public static void CompactAccess(string DBPath)
{
if (!File.Exists(DBPath))
{
throw new Exception("目标数据库不存在,无法压缩");
}
//声明临时数据库名称
string temp = DateTime.Now.Year.ToString();
temp += DateTime.Now.Month.ToString();
temp += DateTime.Now.Day.ToString();
temp += DateTime.Now.Hour.ToString();
temp += DateTime.Now.Minute.ToString();
temp += DateTime.Now.Second.ToString() + ".bak";
temp = DBPath.Substring(0, DBPath.LastIndexOf("//") + 1) + temp;
//定义临时数据库的连接字符串
string temp2 = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="+temp;
//定义目标数据库的连接字符串
string DBPath2 = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="+DBPath;
//创建一个JetEngineClass对象的实例
JRO.JetEngineClass jt = new JRO.JetEngineClass();
//使用JetEngineClass对象的CompactDatabase方法压缩修复数据库
jt.CompactDatabase(DBPath2, temp2);
//拷贝临时数据库到目标数据库(覆盖)
File.Copy(temp, DBPath, true);
//最后删除临时数据库
File.Delete(temp);
}
#endregion#region 备份Access数据库
/// <summary>
/// 备份Access数据库
/// </summary>
/// <param name="srcPath">要备份的数据库绝对路径</param>
/// <param name="aimPath">备份到的数据库绝对路径</param>
/// <returns></returns>
public static void Backup(string srcPath,string aimPath)
{
if (!File.Exists(srcPath))
{
throw new Exception("源数据库不存在,无法备份");
}
try
{
File.Copy(srcPath,aimPath,true);
}
catch(IOException ixp)
{
throw new Exception(ixp.ToString());
}
}#endregion
#region 还原Access数据库
/// <summary>
/// 还原Access数据库
/// </summary>
/// <param name="bakPath">备份的数据库绝对路径</param>
/// <param name="dbPath">要还原的数据库绝对路径</param>
public static void RecoverAccess(string bakPath,string dbPath)
{
if (!File.Exists(bakPath))
{
throw new Exception("备份数据库不存在,无法还原");
}
try
{
File.Copy(bakPath, dbPath, true);
}
catch (IOException ixp)
{
throw new Exception(ixp.ToString());
}
}
#endregion
}
}
补充：数据库,Mssql 
