看网上的例子写的sqlserver数据库备份脚本，这个脚本不是很好，不能删除以前备份的。
declare @CurrentDataBaseName nvarchar(100)
declare @CurrentBackFolder nvarchar(200)
declare @WeekDay VARCHAR(20)
declare @CurrentBackString nvarchar(2000)
declare @day VARCHAR(20)
--SELECT GETDATE() AS 'Current Date'
set @day=convert(varchar(100),getdate(),112)
set @WeekDay = DATEPART(WEEKDAY,GETDATE())
set @CurrentBackFolder='D:\Test'
--set @CurrentDataBaseName='ceshi'
--+convert(varchar(50),112),dbid
--select * from master..sysdatabases where dbid>=7
--weekday 1 表示星期日
if @WeekDay = '1'
begin
declare tb cursor local for select name from master..sysdatabases where dbid>=7;
open tb
fetch next from tb into @CurrentDataBaseName
while @@fetch_status=0
begin
set @CurrentBackString='
USE [master]
BACKUP DATABASE ['+@CurrentDataBaseName+'] TO disK = '''+@CurrentBackFolder+'\'+@CurrentDataBaseName+'.bak'' WITH NOFORMAT,NOINIT,NAME='''+@CurrentDataBaseName+'-'+@day+''',SKIP,norEWIND,NOUNLOAD;';
print @CurrentBackString;
exec sp_executesql @CurrentBackString;
print '备份数据库'+@CurrentDataBaseName +'完成';
fetch next from tb into @CurrentDataBaseName
end
close tb
deallocate tb
print '备份所有数据库完成'
end
else
begin
declare tb cursor local for select name from master..sysdatabases where dbid>=7;
open tb
fetch next from tb into @CurrentDataBaseName
while @@fetch_status=0
begin
set @CurrentBackString='
USE [master]
BACKUP DATABASE ['+@CurrentDataBaseName+'] TO disK = '''+@CurrentBackFolder+'\'+@CurrentDataBaseName+'.bak'' WITH NOFORMAT,NAME='''+@CurrentDataBaseName+'-'+@day+'-diff'',DIFFERENTIAL,
norEWIND,NOUNLOAD,RETAINDAYS=6;';
print @CurrentBackString;
exec sp_executesql @CurrentBackString;
print '差异备份数据库'+@CurrentDataBaseName +'完成';
fetch next from tb into @CurrentDataBaseName
end
close tb
deallocate tb
print '差异备份所有数据库完成'
end
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