【C#】数据库备份及还原的实现代码【转载】

时间:2023-01-07 00:27:51

【转载】http://www.codesky.net/article/200908/128600.html

C#数据库备份及还原1.在用户的配置时,我们需要列出当前局域网内所有的数据库服务器,并且要列出指定服务器的所有数据库,实现代码如下:

取得数据库服务器列表:

public ArrayList GetServerList()
{
ArrayList alServers = new ArrayList() ;
  SQLDMO.Application sqlApp = new SQLDMO.ApplicationClass() ;
try
{
SQLDMO.NameList serverList = sqlApp.ListAvailableSQLServers() ;
for(int i = ;i<= serverList.Count;i++)
{
alServers.Add(serverList.Item(i)) ;
}
}
catch(Exception e)
{
throw(new Exception("取数据库服务器列表出错:"+e.Message)) ;
}
finally
{
sqlApp.Quit() ;
}
return alServers ;
}

取得指定数据库服务器的数据库列表

public ArrayList GetDbList(string strServerName,string strUserName,string strPwd)
{
  ServerName = strServerName ;
  UserName = strUserName ;
  Password = strPwd ;   ArrayList alDbs = new ArrayList() ;
  SQLDMO.Application sqlApp = new SQLDMO.ApplicationClass() ;
  SQLDMO.SQLServer svr = new SQLDMO.SQLServerClass() ;
  try
  {
    svr.Connect(ServerName,UserName,Password) ;
    foreach(SQLDMO.Database db in svr.Databases)
    {
      if(db.Name!=null)
      alDbs.Add(db.Name) ;
    }
  }
  catch(Exception e)
  {
    throw(new Exception("连接数据库出错:"+e.Message)) ;
  }
  finally
  {
    svr.DisConnect() ;
    sqlApp.Quit() ;
  }
  return alDbs ;
}

C#数据库备份及还原2.数据库的备份和实时进度显示代码:

public bool BackUPDB(string strDbName,string strFileName, ProgressBar pgbMain)
{
  PBar = pgbMain ;
  SQLDMO.SQLServer svr = new SQLDMO.SQLServerClass() ;
  try
  {
    svr.Connect(ServerName,UserName,Password) ;
    SQLDMO.Backup bak = new SQLDMO.BackupClass();
    bak.Action = ;
    bak.Initialize = true ;
    SQLDMO.BackupSink_PercentCompleteEventHandler pceh = new SQLDMO.BackupSink_PercentCompleteEventHandler(Step);
    bak.PercentComplete += pceh;
    bak.Files = strFileName;
    bak.Database = strDbName;
    bak.SQLBackup(svr);
    return true ;
  }
  catch(Exception err)
  {
    throw(new Exception("备份数据库失败"+err.Message)) ;
  }
  finally
  {
    svr.DisConnect() ;
  }
} private void Step(string message,int percent)
{
PBar.Value = percent ;
}

其中,这两个语句实现了进度的实时显示:

SQLDMO.BackupSink_PercentCompleteEventHandler pceh = new SQLDMO.BackupSink_PercentCompleteEventHandler(Step); 
bak.PercentComplete += pceh;

Step就是上面private void Step(string message,int percent) 的方法名称,它用来显示进度条的当前进度。

C#数据库备份及还原3.数据库的恢复和杀死进程的代码:

public bool RestoreDB(string strDbName,string strFileName, ProgressBar pgbMain)
{
  PBar = pgbMain ;
  SQLDMO.SQLServer svr = new SQLDMO.SQLServerClass() ;
  try
  {
    svr.Connect(ServerName,UserName,Password) ;
    SQLDMO.QueryResults qr = svr.EnumProcesses(-) ;
    int iColPIDNum = - ;
    int iColDbName = - ;
    for(int i=;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 != - && iColDbName != -)
        break ;
    }     for(int i=;i<=qr.Rows;i++)
    {
      int lPID = qr.GetColumnLong(i,iColPIDNum) ;
      string strDBName = qr.GetColumnString(i,iColDbName) ;
      if (strDBName.ToUpper() == strDbName.ToUpper())
        svr.KillProcess(lPID) ;
    } SQLDMO.Restore res = new SQLDMO.RestoreClass() ;
res.Action = ;
SQLDMO.RestoreSink_PercentCompleteEventHandler pceh = new SQLDMO.RestoreSink_PercentCompleteEventHandler(Step);
res.PercentComplete += pceh;
res.Files = strFileName ; res.Database = strDbName ;
res.ReplaceDatabase = true ;
res.SQLRestore(svr) ;
return true ;
}
catch(Exception err)
{
throw(new Exception("恢复数据库失败,请关闭所有和该数据库连接的程序!"+err.Message)) ;
}
finally
{
svr.DisConnect() ;
}
}

其中这个语句取得了所有的进程列表:

SQLDMO.QueryResults qr = svr.EnumProcesses(-1) ;

下面的语句找到和要恢复数据库相关的进程并杀死:

int iColPIDNum = - ;
int iColDbName = - ;
for(int i=;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 != - && iColDbName != -)
break ;
} for(int i=;i<=qr.Rows;i++)
{
int lPID = qr.GetColumnLong(i,iColPIDNum) ;
string strDBName = qr.GetColumnString(i,iColDbName) ;
if (strDBName.ToUpper() == strDbName.ToUpper())
svr.KillProcess(lPID) ;
}