C#实现SQL数据库备份与恢复

有两种方法，都是保存为.bak文件。一种是直接用Sql语句执行，另一种是通过引用SQL Server的SQLDMO组件来实现:

1.通过执行Sql语句来实现

注意，用Sql语句实现备份与还原操作时，最好不要使用需要备份或还原的数据库连接，而使用master，否则可能会出现如下三个问题：(1)超时时间已到。在操作完成之前超时时间已过或服务器未响应。(2) 在向服务器发送请求时发生传输级错误。(provider:共享内存提供程序,error:0-系统无法打开文件。) (3)从服务器接收结果时发生传输级错误。(provider:共享内存提供程序，error:0 - 系统无法打开文件。) ，如果一定要用这个连接的话，要注意在执行Sql语句前加个Sql语句：use master，这样可能会解决以上问题。

(1)数据备份语句：backup database 数据库名 to disk='保存路径/dbName.bak'

(2)数据恢复语句：restore database 数据库名 from disk='保存路径/dbName.bak'WITH MOVE 'dbName_Data' TO 'c:/tcomcrm20041217.mdf', --数据文件还原后存放的新位置

MOVE 'dbName_Log' TO 'c:/comcrm20041217.ldf' ----日志文件还原后存放的新位置

关于这两个语句还有更详细的介绍：http://blog.csdn.net/holyrong/archive/2007/08/29/1764105.aspx

//数据库备份与恢复实例

private void btnBak_Click(object sender, EventArgs e) //备份

{

string saveAway = this.tbxBakLoad.Text.ToString().Trim();

string cmdText = @"backup database " + System.Configuration.ConfigurationSettings.AppSettings["dbName"] + " to disk='" + saveAway + "'";

BakReductSql(cmdText,true);

}

private void btnReduct_Click(object sender, EventArgs e) //恢复

{

string openAway = this.tbxReductLoad.Text.ToString().Trim();//读取文件的路径

string cmdText = @"restore database " + System.Configuration.ConfigurationSettings.AppSettings["dbName"] + " from disk='" + openAway + "'";

BakReductSql(cmdText,false);

}

/// <summary>

/// 对数据库的备份和恢复操作，Sql语句实现

/// </summary>

/// <param name="cmdText">实现备份或恢复的Sql语句</param>

/// <param name="isBak">该操作是否为备份操作，是为true否，为false</param>

private void BakReductSql(string cmdText,bool isBak)

{

SqlCommand cmdBakRst = new SqlCommand();

SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=master;u);

try

{

conn.Open();

cmdBakRst.Connection = conn;

cmdBakRst.CommandType = CommandType.Text;

if (!isBak) //如果是恢复操作

{

string setOffline = "Alter database GroupMessage Set Offline With rollback immediate ";

string setOnline = " Alter database GroupMessage Set Online With Rollback immediate";

cmdBakRst.CommandText = setOffline + cmdText + setOnline;

}

else

{

cmdBakRst.CommandText = cmdText;

}

cmdBakRst.ExecuteNonQuery();

if (!isBak)

{

MessageBox.Show("恭喜你，数据成功恢复为所选文档的状态！", "系统消息");

}

else

{

MessageBox.Show("恭喜，你已经成功备份当前数据！", "系统消息");

}

}

catch (SqlException sexc)

{

MessageBox.Show("失败，可能是对数据库操作失败，原因：" + sexc, "数据库错误消息");

}

catch (Exception ex)

{

MessageBox.Show("对不起，操作失败，可能原因：" + ex, "系统消息");

}

finally

{

cmdBakRst.Dispose();

conn.Close();

conn.Dispose();

}

}

另外，如果出现：“尚未备份数据库的日志尾部”错误，可以在还原语句后加上 With Replace 或 With stopat

2.用SQLDMO实现（下面代码引用别人的）

//数据库备份

string backaway =textbox1.Text.Trim();

SQLDMO.Backup oBackup = new SQLDMO.BackupClass();

SQLDMO.SQLServer oSQLServer = new SQLDMO.SQLServerClass();

try

{

oSQLServer.LoginSecure = false;

//下面设置登录sql服务器的ip,登录名,登录密码

oSQLServer.Connect(serverip, serverid, serverpwd);

oBackup.Action = 0;

//下面两句是显示进度条的状态

SQLDMO.BackupSink_PercentCompleteEventHandler pceh = new SQLDMO.BackupSink_PercentCompleteEventHandler(Step2);

oBackup.PercentComplete += pceh;

//数据库名称:

oBackup.Database = "k2";

//备份的路径

oBackup.Files = @backaway;

//备份的文件名

oBackup.BackupSetName = "k2";

oBackup.BackupSetDescription = "数据库备份";

oBackup.Initialize = true;

oBackup.SQLBackup(oSQLServer);

MessageBox.Show("备份成功！", "提示");

}

catch

{

MessageBox.Show("备份失败！", "提示");

}

finally

{

oSQLServer.DisConnect();

}

//数据库恢复

//获取恢复的路径

string dbaway = textbox2.Text.Trim();

SQLDMO.Restore restore = new SQLDMO.RestoreClass();

SQLDMO.SQLServer server = new SQLDMO.SQLServerClass();

server.Connect(serverip, serverid, serverpwd);

//KILL DataBase Process

conn = new 工资管理系统.CCUtility.connstring();

conn.DBOpen();

SqlCommand cmd = new SqlCommand("use master Select spid FROM sysprocesses ,sysdatabases Where sysprocesses.dbk2'", conn.Connection);

SqlDataReader dr = cmd.ExecuteReader();

while (dr.Read())

{

server.KillProcess(Convert.ToInt32(dr[0].ToString()));

}

dr.Close();

conn.DBClose();

try

{

restore.Action = 0;

SQLDMO.RestoreSink_PercentCompleteEventHandler pceh = new SQLDMO.RestoreSink_PercentCompleteEventHandler(Step);

restore.PercentComplete += pceh;

restore.Database = "k2";

restore.Files = @dbaway;

restore.ReplaceDatabase = true;

restore.SQLRestore(server);

MessageBox.Show("数据库恢复成功！");

}

catch (Exception ex)

{

MessageBox.Show(ex.Message);

}

finally

{

server.DisConnect();

}

恢复相关的参数和备份相同,不再解释,自己看一下.

上面两个函数调用到了更改进度条的两个函数:

private void Step2(string message, int percent)

{

progressBar2.Value = percent;

}

private void Step(string message, int percent)

{

progressBar1.Value = percent;

}

setp对应备份,,setp2对应恢复....