一段脚本实现自动备份并保存最近几天的SQL数据库

代码如下：

DECLARE @filename VARCHAR(255) 
DECLARE @date DATETIME 
SELECT @date=GETDATE() 
SELECT @filename = 'G:\存放位置\数据库名称-'+CAST(DATEPART(yyyy,@date) as varchar)+'-'+CAST(DATEPART(mm,@date) as varchar)+'-'+CAST(DATEPART(dd,@date) as varchar)+'.bak' 
BACKUP DATABASE [数据库名称] TO DISK = @filename WITH INIT 
GO 

DECLARE @OLDDATE DATETIME 
SELECT @OLDDATE=GETDATE()-5 
EXECUTE master.dbo.xp_delete_file 0,N'G:\存放位置',N'bak',@olddate,1