declare @device varchar(30);
declare @filename varchar(50);
declare @datetime varchar(50);
declare @weekname varchar(50);
declare @weeknametmp varchar(4);
declare @weekday int;
set @weekname=datename(weekday,getdate());
set @datetime = convert(varchar(20),getdate(),112);
set @device= 'NWdevice' + @datetime;
set @filename='c:\NWdevice'+@datetime+'.bak';
set @weeknametmp=substring(@weekname,3,1);
if (@weeknametmp='一')
set @weekday=1;
else if (@weeknametmp='二')
set @weekday=2;
else if (@weeknametmp='三')
set @weekday=3;
else if (@weeknametmp='四')
set @weekday=4;
else if (@weeknametmp='五')
set @weekday=5;
else if (@weeknametmp='六')
set @weekday=6;
else if (@weeknametmp='日')
set @weekday=0;
set @datetime = convert(varchar(20),getdate()-@weekday,112);
set @device= 'NWdevice' + @datetime;
set @filename='c:\NWdevice'+@datetime+'.bak'
if (@weekname='星期日')
begin
execute sp_addumpdevice 'disk',@device,@filename;
backup database northwind to @device
end
else
begin
backup database northwind to @device with differential
end