c#数据库备份与恢复

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 = 1;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 ;
}

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 = 0 ;
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。


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(-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() == strDbName.ToUpper())
svr.KillProcess(lPID) ;
}

SQLDMO.Restore res = new SQLDMO.RestoreClass() ;
res.Action = 0 ;
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 = -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() == strDbName.ToUpper())
svr.KillProcess(lPID) ;
}