mssql返回表的创建语句

if OBJECT_ID('sp_create_table_sql','P') is not null
drop proc sp_create_table_sql
go
create proc sp_create_table_sql ( @tablename varchar(255) ) 
as 
begin
	 -- exec sp_create_table_sql 'Ad_AdGroup'
	 -- 0. 弘恩
	 -- 1. 不支持非主键类的索引
	 -- 2. 不支持主分键的非默认排序
	 -- 3. 不支持DEFAULT
	 -- 4. 不支持计算列
	 -- 5. 待完整 
	declare @sql_create varchar(max) = '';
	declare @sql_column varchar(max);
	declare @sql_primary varchar(max);
	
	with cte as 
	(
	select QUOTENAME( c.name )+' '+
	TYPE_NAME(c.system_type_id)+' '+
	case when TYPE_NAME( c.system_type_id) in ('char','varchar','decimal') then ' ( ' else '' end +
	case when TYPE_NAME( c.system_type_id) in ('char','varchar','nvarchar' ) then cast(max_length as varchar) else '' end+
	case when TYPE_NAME( c.system_type_id) in ('decimal' ) then cast(c.precision as varchar)+','+cast(c.scale AS varchar) else '' end+ 
	case when TYPE_NAME( c.system_type_id) in ('char','varchar','decimal') then ' ) ' else '' end +
	case when c.is_nullable = 1 then ' null ' else ' not null ' end +
	case when c.is_identity = 0 then ' ' else ' identity ' end sqlstr , 
	
	column_id
	 from sys.objects as o
	 join sys.columns as c on o.object_id = c.object_id 
	 where o.name = @tablename and o.type = 'U'
	 )
	select @sql_column = stuff(
	(select ',' + sqlstr + CHAR(10)
	from cte 
	order by column_id asc 
	for xml path('') ),1,1,'')
	 ;
	
	select @sql_primary = stuff(( 
	 select ',' + c.name
	 from sys.index_columns as i 
	 join sys.indexes as ix on i.object_id = ix.object_id and i.index_id = ix.index_id
	 join sys.columns as c on i.object_id = c.object_id and i.column_id = c.column_id
	 where OBJECT_NAME(i.object_id) = @tablename
	 and ix.is_primary_key = 1
	 order by i.key_ordinal
	 for xml path('')
	 ),1,1,'')

	 
	 set @sql_create = ' create table ' + @tablename + '( ' 
	 + @sql_column 
	 + case when len(@sql_primary) >= 1 then (', primary key ( ' + @sql_primary + ')') else '' end 
	 + ' ) '
	 
	 
	print ' -- @sql_create -- '
	print @sql_create
end