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 --检查sqlserver所在服务的运行账号是否有权限访问共享文件夹，没有的话右键添加写权限
 --检查方法：建立一网络驱动器，右键属性安全
 --注:若sqlserver在localsystem账号下面运行，是访问不了共享文件夹的，要改成有权限的账号，如network services

 --开启权限
sp_configure 'show advanced options', 1;
go
reconfigure;
go

 EXEC sp_configure 'xp_cmdshell', 1

GO

reconfigure;
go

DECLARE @DesAddress NVARCHAR(500),@DesAccount NVARCHAR(100),@DesPassword NVARCHAR(100), @DataBaseName VARCHAR(100)
SET @DesAddress = '\\172.16.88.204\soft-0509\aa'
SET @DesAccount = 'administrator'
SET @DesPassword = 'Lvshou!@#'
SET @DataBaseName = 'master'

DECLARE @bakName VARCHAR(500)
SET @bakName = @DataBaseName + '_' +  convert(varchar(10),getdate(),112) + '.bak'
SET @bakName = @DesAddress + '\' + @bakName
--print @bakName

DECLARE @sql NVARCHAR(1000)

--连接共享，打开通道
SET @sql = 'net use Y: '+ @DesAddress+ ' ' + @DesPassword + ' ' +'/user:'+@DesAccount
PRINT @sql
EXEC master..xp_cmdshell @sql

--备份
SET @sql = 'backup database ' +@DataBaseName + ' TO DISK = ' + QUOTENAME(@bakName,'''')
--PRINT @sql
EXEC (@sql)

--删除一周前备份
SET @sql = 'del ' + @DesAddress + '\' + @DataBaseName + '_' +  convert(varchar(10),dateadd(day,-7,getdate()),112) + '.bak'
--PRINT @sql
EXEC master..xp_cmdshell @sql

--执行关闭关掉通道
exec master..xp_cmdshell 'net use Y: /delete /y' 

--关闭权限
EXEC sp_configure 'xp_cmdshell', 0

GO

reconfigure;
go


 sp_configure 'show advanced options', 0
go
reconfigure;
go