ReadMediaHeader Method (Restore)
Esse recurso será removido em uma versão futura do Microsoft SQL Server. Evite usar esse recurso em desenvolvimentos novos e planeje modificar os aplicativos que atualmente o utilizam.
The ReadMediaHeader method returns a QueryResults object enumerating the values of a backup media header record.
Sintaxe
object.ReadMediaHeader(Server)asQueryResults
Parts
object
Expression that evaluates to an object in the Applies To list.Server
SQLServer object connected to an instance of Microsoft SQL Server on which the backup device or operating system file is visible.
Prototype (C/C++)
HRESULT ReadMediaHeader(
LPSQLDMOSERVER ServerObject,
LPSQLDMOQUERYRESULTS* ppResults);
Returns
A QueryResults object containing one result set. For a description of the result set contents, see ReadBackupHeader Method (BackupDevice).
Comentários
A database backup performed by SQL Server can target multiple devices of a single type and can span multiple media maintained by the device. To organize media used in backup, SQL Server defines the media set and media family. A media label, or header record, maintains data about a media's location within a media set and media family.
To use the ReadMediaHeader method
Create a SQLServer object.
Connect the SQLServer object to an instance of SQL Server on which the source backup device is visible.
Create a Restore object.
Set either the Devices, Files, Pipes, or Tapes property to indicate a device or operating system file visible on an instance of SQL Server created in Step 1 and maintaining the backup media.
Call the ReadMediaHeader method of the Restoreobject using the SQLServer object created in Step 1 as an argument.
When the media of a backup device is unused or unlabeled, such as when a disk device is empty, the ReadMediaHeader method succeeds, returning an empty QueryResults object.