if not exists(select 0 from syscolumns where id=object_id('KtvAppEnter') and name='Tag')
 alter table KtvAppenter add Tag nvarchar(500) default('')
if not exists(select 0 from syscolumns where id=object_id('KtvAppEnter') and name='Summary')
 alter table KtvAppenter add Summary nvarchar(500) default('')
if not exists(select 0 from syscolumns where id=object_id('KtvAppEnter') and name='BgPic')
 alter table KtvAppenter add BgPic nvarchar(500) default('')
if not exists (select 0 from syscolumns where id=object_id('ktvmodule_submain') and name='sort')
   ALTER TABLE ktvmodule_submain Add sort int 
if not exists (select 0 from syscolumns where id=OBJECT_ID('ktvmodule_class') and name='light')
   alter table ktvmodule_class add light int null