如何使用C#以编程方式获取SQL Server 2008 Express R2的默认备份路径

Question

我有一个将分发给客户的web应用程序。我将通过管理网页为他们提供备份和恢复后端SQL Server数据库的选项。

对于备份，我只是使用时间戳以编程方式创建一个文件名，并让SQL Server将其保存在默认的备份文件夹中。为了恢复，我想列出备份文件，让用户选择使用哪一个，但我不知道获得文件列表的默认备份文件夹是什么。

如何使用C#以编程方式获取SQL Server 2008 Express R2的默认备份文件夹？

感谢

Answer 1

要检索给定服务器的备份路径，可以使用SQL server管理对象。Server对象具有名为BackupDirectory的属性。

你会想要这样的东西：

Server srv = new Server("SERVERNAME");
string backUpDir = srv.BackupDirectory;

为此，您需要导入usings/references For：

Microsoft.SqlServer.Management.Smo;
Microsoft.SqlServer.Management.Common;

您将在此处找到有关如何与SQL Server管理对象交互的详细信息。

Answer 2

尝试采用这个存根：

    private void GetSqlDefaultInfo(string InstanceName, string ServerName)
    {
        try
        {
            InstanceName = string.IsNullOrEmpty(InstanceName) ? "MSSQLSERVER" : InstanceName;
            if (string.IsNullOrEmpty(ServerName))
                ServerName = Environment.MachineName;
            using (var registryKey = RegistryKey.OpenRemoteBaseKey(RegistryHive.LocalMachine, ServerName))
            {
                object sqlInstance;
                using (var subKey = registryKey.OpenSubKey(@"SOFTWAREMicrosoftMicrosoft SQL ServerInstance NamesSQL"))
                    sqlInstance = subKey.GetValue(InstanceName);
                if (sqlInstance != null && !string.IsNullOrEmpty(sqlInstance.ToString()))
                {
                    var sqlPathKey = string.Format(@"SOFTWAREMicrosoftMicrosoft SQL Server{0}MSSQLServer",
                                                   sqlInstance);
                    object defaultData, defaultLog, backupDirectory, sqlPath;
                    using (var subKey = registryKey.OpenSubKey(sqlPathKey))
                    {
                        defaultData = subKey.GetValue("DefaultData");
                        defaultLog = subKey.GetValue("DefaultLog");
                        backupDirectory = subKey.GetValue("BackupDirectory");
                    }
                    sqlPathKey = string.Format(@"SOFTWAREMicrosoftMicrosoft SQL Server{0}Setup", sqlInstance);
                    using (var subKey = registryKey.OpenSubKey(sqlPathKey))
                        sqlPath = subKey.GetValue("SQLDataRoot");
                    DataFilePath = defaultData != null
                                       ? defaultData.ToString()
                                       : Path.Combine(sqlPath.ToString(), "Data").TrimEnd('\');
                    LogFilePath = defaultLog != null
                                      ? defaultLog.ToString()
                                      : Path.Combine(sqlPath.ToString(), "Data").TrimEnd('\');
                    FTSIndexFilePath = DataFilePath;
                    ContentFilePath = DataFilePath;
                    BackupFilePath = backupDirectory != null
                                         ? backupDirectory.ToString()
                                         : Path.Combine(sqlPath.ToString(), "Backup").TrimEnd('\');
                }
            }
        } catch(Exception)
        {
        }
    }

Answer 3

下面的查询应该为您提供每个数据库的物理设备名称（或路径）。您可以根据自己的需求进行定制：

select
    database_name,
    backup_type,
    physical_device_name -- path
from
(
    select 
        row_number() over (partition by database_name,type order by backup_start_date desc) as rownum,
        database_name,
        case type 
            when 'L' then 'Log' 
            when 'D' then 'Data'
            else '??? '+type 
        end as backup_type,
        physical_device_name
    from msdb.dbo.backupset a 
    join msdb..backupmediaset b on a.media_set_id = b.media_set_id 
    join msdb.dbo.backupmediafamily c on a.media_set_id = c.media_set_id
) x
where rownum=1
order by database_name asc, backup_type

Answer 4

我最终使用了以下SqlCommand。。。这个解决方案出现在另一个答案中，但由于某种原因被删除了。？不管怎样，这是我最终使用的命令：

EXEC  master.dbo.xp_instance_regread  N'HKEY_LOCAL_MACHINE', N'Software\Microsoft\MSSQLServer\MSSQLServer',N'BackupDirectory'

这是我的C#代码中的命令，它显示了存储在变量backupFolder:中的默认备份文件夹路径

            SqlConnection myConnection = new SqlConnection(ConfigurationManager.ConnectionStrings["connectionString"].ConnectionString);
            SqlCommand cmd = new SqlCommand();
            SqlDataReader reader;
            cmd.CommandText = "EXEC  master.dbo.xp_instance_regread  N'HKEY_LOCAL_MACHINE', N'Software\Microsoft\MSSQLServer\MSSQLServer',N'BackupDirectory'";
            cmd.CommandType = CommandType.Text;
            cmd.Connection = myConnection;
            myConnection.Open();
            SqlDataReader myDataReader = cmd.ExecuteReader();
            myDataReader.Read();
            string backupFolder = myDataReader.GetString(1);

Answer 5

您要查找的值存储在注册表中

Key: HKEY_LOCAL_MACHINESOFTWAREMicrosoftMicrosoft SQL ServerMSSQL.2MSSQLServer
Value: BackupDirectory

请注意，密钥取决于您的SQL Server实例名称。

Answer 6

declare @regread nvarchar(max)
select  top 1 @regread = substring(registry_key,6,len(registry_key)-16)
from    sys.dm_server_registry
where   registry_key like '%Parameters'
group by registry_key
select @regread = 'exec master..xp_regread ''HKEY_LOCAL_MACHINE'','''+@regread+''', ''BackupDirectory'''
exec sp_executesql @regread