如何從C＃中選擇要還原的SQL備份集

Question

我想以編程方式從C＃恢復sql數據庫。 我的.bak文件包含多個備份集。 我想同時恢復所有這些。

當我運行以下sql腳本時，我成功恢復了最舊的備份集：

ALTER DATABASE [My_DB] SET SINGLE_USER WITH ROLLBACK IMMEDIATE;
RESTORE DATABASE [My_DB] FROM DISK = 'C:\backup.bak' WITH REPLACE;

是否可以選擇要還原的備份集？

提前致謝！

Answer 1

我不認為這與C# ，它與T-SQL 。

T-SQL restore將允許您定義備份集中的哪個文件還原。 可以使用WITH FILE=number_of_file輕松定義它。

以下是MSDN文章完整數據庫還原（完全恢復模型）的示例：

USE master;  
--Create tail-log backup.  
BACKUP LOG AdventureWorks2012   
TO DISK = 'Z:\SQLServerBackups\AdventureWorksFullRM.bak'    
   WITH NORECOVERY;   
GO  
--Restore the full database backup (from backup set 1).  
RESTORE DATABASE AdventureWorks2012   
  FROM DISK = 'Z:\SQLServerBackups\AdventureWorksFullRM.bak'   
  WITH FILE=1,   
    NORECOVERY;  

--Restore the regular log backup (from backup set 2).  
RESTORE LOG AdventureWorks2012   
  FROM DISK = 'Z:\SQLServerBackups\AdventureWorksFullRM.bak'   
  WITH FILE=2,   
    NORECOVERY;  

--Restore the tail-log backup (from backup set 3).  
RESTORE LOG AdventureWorks2012   
  FROM DISK = 'Z:\SQLServerBackups\AdventureWorksFullRM.bak'  
  WITH FILE=3,   
    NORECOVERY;  
GO  
--recover the database:  
RESTORE DATABASE AdventureWorks2012 WITH RECOVERY;  
GO  

我建議你也看看這個解決方法：

將數據庫還原到備份集中的最新文件：

declare @dbname varchar(80),
        @lastfull datetime,
        @fullback varchar(1024),
        @position int,
        @SQL nvarchar(max)

set @dbname = 'YourDB'


select @lastfull = MAX(backup_finish_date) 
FROM master.sys.databases d
LEFT OUTER JOIN msdb.dbo.backupset b ON d.name = b.database_name AND b.type = 'D'
WHERE d.database_id NOT IN (2, 3) and d.name=@dbname


SELECT    @fullback = m.physical_device_name, @position = b.position
FROM         msdb.dbo.backupmediafamily AS m INNER JOIN
                      msdb.dbo.backupset AS b ON m.media_set_id = b.media_set_id 
                      and b.type='D' and b.database_name=@dbname
                      AND b.backup_finish_date=@lastfull


set @SQL =  'RESTORE DATABASE [' + @DBname + '] FROM  DISK = N''' + @fullback +  ''' WITH  FILE = ' + convert(nvarchar,@position) + ',  RECOVERY,  NOUNLOAD,  STATS = 10'
EXEC SP_EXECUTESQL @SQL