Sql server 得到表结构的Sql语句

declare @sql varchar(8000),@tablename varchar(100)
set @tablename ='Test'--这里输入表名
set @sql = '
if object_id('''+@tablename+''',''u'') is not null
drop table '+@tablename+' '+CHAR(10)+'go
create table ['+@tablename+']
(
'
select
@sql = @sql + b.name + ' '+
c.name+
case when c.collation_name is not null then '('+
case when b.max_length <>-1 then convert(varchar(100),b.max_length)
else 'MAX' end +') '
else '' end +
case when b.is_identity = 1 then ' identity('+convert(varchar(100),IDENT_SEED(@tablename))+','+convert(varchar(100),IDENT_INCR(@tablename))+')' else '' end +
case when d.definition is not null then ' default('+d.definition +')' else '' end +
case when b.is_nullable = 0 then ' not null' else ' null' end +

',
'
from sys.objects a
join sys.columns b on a.object_id = b.object_id
join sys.types c on b.system_type_id = c.system_type_id and b.user_type_id = c.user_type_id
left join sys.default_constraints d on b.default_object_id = d.object_id
where a.name =@tablename
order by b.column_id

if exists(select * from sys.indexes where object_id =object_id(@tablename) and is_primary_key =1 )
begin
select @sql = @sql + 'CONSTRAINT ['+name+'] PRIMARY KEY '+type_desc+'
(
' from sys.indexes where object_id =object_id(@tablename) and is_primary_key =1
select @sql = @sql + b.name + case when a.is_descending_key =1 then ' DESC' else ' ASC' end +',
' from sys.index_columns a join sys.columns b
on a.object_id= b.object_id and a.column_id = b.column_id
where a.object_id =object_id(@tablename)
select @sql = left(@sql,len(@sql)-3)+'
)'
select @sql = @sql+'
) ON [PRIMARY] '
end
else
begin
select @sql = left(@sql,len(@sql)-1)+'
) ON [PRIMARY] '
end
PRINT @sql